essays on genetic engineering

132 Genetic Engineering Essay Topic Ideas & Examples

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• Ethical Issues of Synthetic Biology
• CRISPR-Cas9 and Its Applications
• Progress and Challenges in Gene Therapy
• Applications of Gene Editing in Animals
• The Process of Genetic Engineering in Plants
• Genetic Engineering for Human Enhancement
• Genetic Engineering for Improving Crop Yield
• Regulatory Issues of Genetic Editing of Embryos
• Gene Silencing in Humans through RNA Interference
• Gene Drive Technology for Controlling Invasive Species
• The Ethical Issues of Genetic Engineering Many people have questioned the health risks that arise from genetically modified crops, thus it is the politicians who have to ensure that the interests of the people are met and their safety is assured. […]
• The Film “Gattaca” and Genetic Engineering In the film, it is convincing that in the near future, science and technology at the back of genetic engineering shall be developed up to the level which makes the film a reality.
• Changing the world: Genetic Engineering Effects Genes used in genetic engineering have a high impact on health and disease, therefore the inclusion of the genetic process alters the genes that influence human behavior and traits.
• A Major Milestone in the Field of Science and Technology: Should Genetic Engineering Be Allowed? The most controversial and complicated aspect of this expertise is Human Genetic Engineering- whereby the genotype of a fetus can be altered to produce desired results.
• Religious vs Scientific Views on Genetic Engineering With the need to increase the global economy, the field of agriculture is one among the many that have been used to improve the commercial production to take care of the global needs for food […]
• The Dangers of Genetic Engineering and the Issue of Human Genes’ Modification In this case, the ethics of human cloning and human genes’ alteration are at the center of the most heated debates. The first reason to oppose the idea of manipulation of human genes lies in […]
• Is Genetic Engineering an Environmentally Sound Way to Increase Food Production? According to Thomas & Earl and Barry, genetic engineering is environmentally unsound method of increasing food production because it threatens the indigenous species.
• Human Genetic Engineering: Key Principles and Issues There are many options for the development of events in the field of genetic engineering, and not all of them have been studied. To conclude, human genetic engineering is one of the major medical breakthroughs, […]
• Mitochondrial Diseases Treatment Through Genetic Engineering Any disorders and abnormalities in the development of mitochondrial genetic information can lead to the dysfunction of these organelles, which in turn affects the efficiency of intracellular ATP production during the process of cellular respiration.
• Genetic Engineering: Is It Ethical to Manipulate Life? In the case of more complex operations, genetic engineering can edit existing genes to turn on or off the synthesis of a particular protein in the organism from which the gene was taken.
• Biotechnology and Genetic Engineering Apart from that, there are some experiments that cannot be ethically justified, at least in my opinion, for example, the cloning of human being or the attempts to find the gene for genius.
• Genetic Engineering in the Movie “Gattaca” by Niccol This would not be right at all since a person should be responsible for their own life and not have it dictated to them as a result of a societal construct created on the basis […]
• Genetic Engineering Using a Pglo Plasmid The objective of this experiment is to understand the process and importance of the genetic transformation of bacteria in real time with the aid of extrachromosomal DNA, alternatively referred to as plasmids.
• Managing Diabetes Through Genetic Engineering Genetic engineering refers to the alteration of genetic make-up of an organism through the use of techniques to introduce a new DNA or eliminate a given hereditable material. What is the role of genetic engineering […]
• The Role of Plant Genetic Engineering in Global Security Although it can be conveniently stated that the adequacy, abundance and reliability of the global food supply has a major role to play in the enhancement of human life, in the long run, they influence […]
• Significance of Human Genetic Engineering The gene alteration strategy enables replacing the specific unwanted genes with the new ones, which are more resistant and freer of the particular ailment, hence an essential assurance of a healthy generation in the future.
• Is the World Ready for Genetic Engineering? The process of manipulating genes has brought scientists to important discoveries, among which is the technology of the production of new kinds of crops and plants with selected characteristics. The problem of the advantages and […]
• Genome: Bioethics and Genetic Engineering Additionally, towards the end of the documentary, the narrator and some of the interviewed individuals explain the problem of anonymity that is also related to genetic manipulations.
• Gattaca: Ethical Issues of Genetic Engineering Although the world he lives in has determined that the only measure of a man is his genetic profile, Vincent discovers another element of man that science and society have forgotten.
• Genetic Engineering Is Ethically Unacceptable However, the current application of genetic engineering is in the field of medicine particularly to treat various genetic conditions. However, this method of treatment has various consequences to the individual and the society in general.
• Designer Genes: Different Types and Use of Genetic Engineering McKibben speaks of Somatic Gene Therapy as it is used to modify the gene and cell structure of human beings so that the cells are able to produce certain chemicals that would help the body […]
• A Technique for Controlling Plant Characteristics: Genetic Engineering in the Agriculture A cautious investigation of genetic engineering is required to make sure it is safe for humans and the environment. The benefit credited to genetic manipulation is influenced through the utilization of herbicide-tolerant and pest-safe traits.
• Genetically Engineered Food Against World Hunger I support the production of GMFs in large quality; I hold the opinion that they can offer a lasting solution to food problems facing the world.
• Genetic Engineering in Food: Development and Risks Genetic engineering refers to the manipulation of the gene composition of organisms, to come up with organisms, which have different characteristics from the organic ones.
• Genetic Engineering in the Workplace The main purpose of the paper is to evaluate and critically discuss the ethical concerns regarding the implementation of genetic testing in the workplace and to provide potential resolutions to the dilemmas.
• Designer Babies Creation in Genetic Engineering The creation of designer babies is an outcome of advancements in technology hence the debate should be on the extent to which technology can be applied in changing the way human beings live and the […]
• Genetic Engineering and Eugenics Comparison The main idea in genetic engineering is to manipulate the genetic make-up of human beings in order to shackle their inferior traits. The concept of socially independent reproduction is replicated in both eugenics and genetic […]
• Future of Genetic Engineering and the Concept of “Franken-Foods” This is not limited to cows alone but extends to pigs, sheep, and poultry, the justification for the development of genetically modified food is based on the need to feed an ever growing population which […]
• Ecological Effects of the Release of Genetically Engineered Organisms Beneficial soil organisms such as earthworms, mites, nematodes, woodlice among others are some of the soil living organisms that are adversely affected by introduction of genetically engineered organisms in the ecosystem since they introduce toxins […]
• Proposition 37 and Genetically Engineered Foods The discussion of Proposition 37 by the public is based on the obvious gap between the “law on the books” and the “law in action” because Food Safety Law which is associated with the Proposition […]
• Is Genetically Engineered Food the Solution to the World’s Hunger Problems? However, the acceptance of GMO’s as the solution to the world’s food problem is not unanimously and there is still a multitude of opposition and suspicion of their use.
• Benefits of Genetic Engineering as a Huge Part of People’s Lives Genetic Engineering is said to question whether man has the right to manipulate the course and laws of nature and thus is in constant collision with religion and the beliefs held by it regarding life.
• Perfect Society: The Effects of Human Genetic Engineering
• Genetic Engineering and Forensic Criminal Investigations
• Biotechnology Assignment and Genetic Engineering
• Genetic Engineering and Genetically Modified Organisms
• Bio-Ethics and the Controversy of Genetic Engineering
• Health and Environmental Risks of Genetic Engineering in Food
• Genetic Engineering and the Risks of Enforcing Changes on Organisms
• Genetic Engineering and How It Affects Globel Warming
• Cloning and Genetic Engineering in the Food Animal Industry
• Genetic Engineering and Its Impact on Society
• Embryonic Research, Genetic Engineering, & Cloning
• Genetic Engineering: Associated Risks and Possibilities
• Issues Concerning Genetic Engineering in Food Production
• Genetic Engineering, DNA Fingerprinting, Gene Therapy
• Cloning: The Benefits and Dangers of Genetic Engineering
• Genetic Engineering, History, and Future: Altering the Face of Science
• Islamic and Catholic Views on Genetic Engineering
• Gene Therapy and Genetic Engineering: Should It Be Approved in the US
• Exploring the Real Benefits of Genetic Engineering in the Modern World
• Genetic Engineering and Food Security: A Welfare Economics Perspective
• Identify the Potential Impact of Genetic Engineering on the Future Course of Human Immunodeficiency Virus
• Genetic Engineering and DNA Technology in Agricultural Productivity
• Human Genetic Engineering: Designing the Future
• Genetic Engineering and the Politics Behind It
• The Potential and Consequences of Genetic Engineering
• Genetic Engineering and Its Effect on Human Health
• The Moral and Ethical Controversies, Benefits, and Future of Genetic Engineering
• Gene Therapy and Genetic Engineering for Curing Disorders
• Genetic Engineering and the Human Genome Project
• Ethical Standards for Genetic Engineering
• Genetic Engineering and Cryonic Freezing: A Modern Frankenstein
• The Perfect Child: Genetic Engineering
• Genetic Engineering and Its Effects on Future Generations
• Agricultural Genetic Engineering: Genetically Modified Foods
• Genetic Engineering: The Manipulation or Alteration of the Genetic Structure of a Single Cell or Organism
• Analysing Genetic Engineering Regarding Plato Philosophy
• The Dangers and Benefits of Human Cloning and Genetic Engineering
• Genetic Engineering: Arguments of Both Proponents and Opponents and a Mediated Solution
• Genetic and How Genetic Engineering Is Diffusing Individualism
• Finding Genetic Harmony With Genetic Engineering
• What Is Genetic Engineering?
• Do You Think Genetically Modified Food Could Harm the Ecosystems of the Areas in Which They Grow?
• How Agricultural Research Systems Shape a Technological Regime That Develops Genetic Engineering?
• Can Genetic Engineering for the Poor Pay Off?
• How Does Genetic Engineering Affect Agriculture?
• Do You Think It’s Essential to Modify Genes to Create New Medicines?
• How Can Genetic Engineering Stop Human Suffering?
• Can Genetic Engineering Cure HIV/AIDS in Humans?
• How Has Genetic Engineering Revolutionized Science and the World?
• Do You Think Genetic Engineering Is Playing God and That We Should Leave Life as It Was Created?
• What Are Some Advantages and Disadvantages of Genetic Engineering?
• How Will Genetic Engineering Affect the Human Race?
• When Does Genetic Engineering Go Bad?
• What Are the Benefits of Human Genetic Engineering?
• Does Genetic Engineering Affect the Entire World?
• How Does the Christian Faith Contend With Genetic Engineering?
• What Are the Ethical and Social Implications of Genetic Engineering?
• How Will Genetic Engineering Impact Our Lives?
• Why Should Genetic Engineering Be Extended?
• Will Genetic Engineering Permanently Change Our Society?
• What Are People Worried About Who Oppose Genetic Engineering?
• Do You Worry About Eating GM (Genetically Modified) Food?
• What Do You Think of the Idea of Genetically Engineering New Bodily Organs to Replace Yours When You Are Old?
• Should Genetic Engineering Go Ahead to Eliminate Human Flaws, Such as Violence, Jealousy, Hate, Etc?
• Does the Government Have the Right to Limit How Far We Modify Ourselves?
• Why Is Genetic Food Not Well Accepted?
• What Is the Best in the Genetic Modification of Plants, Plant Cell, or Chloroplasts and Why?
• How Do You Feel About Human Gene Editing?
• Does Climate Change Make the Genetic Engineering of Crops Inevitable?
• What Do You Think About Plant Genetic Modification?
• Gene Drives and Pest Control
• The Benefits of Genetically Modified Organisms
• Challenges of Gene Editing for Rare Genetic Diseases
• The Use of Genetic Engineering to Treat Human Diseases
• Ethical Considerations and Possibilities of Designer Babies
• How Genetic Engineering Can Help Restore Ecosystems
• Basic Techniques and Tools for Gene Manipulation
• Latest Advancements in Genetic Engineering and Genome Editing
• Will Engineering Resilient Organisms Help Mitigate Climate Change?
• Creation of Renewable Resources through Genetic Engineering
• Genetic Engineering Approach to Drought and Pest Resistance
• Genetic Engineering Use in DNA Analysis and Identification
• Synthetic Microorganisms and Biofactories for Sustainable Bioproduction
• Stem Cells’ Potential for Regenerative Medicine
• The Role of Genetic Modification in Vaccine Development
• Can Genetic Engineering Help Eradicate Invasive Species Responsibly?
• Genetic Engineering for Enhancing the Body’s Defense Mechanisms
• Advancements in Transplantation Medicine and Creating Bioengineered Organs
• Genetic Editing of Microbes for Environmental Cleanup
• Is It Possible to Develop Living Detection Systems?
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Arguing For and Against Genetic Engineering

Harvard philosopher Michael Sandel recently spoke at Stanford on the subject of his new book, The Case against Perfection: Ethics in the Age of Genetic Engineering. He focused on the “ethical problems of using biomedical technologies to determine and choose from the genetic material of human embryos,” an issue that has inspired much debate.

Having followed Sandel’s writings on genetic enhancement for several years, I think that this issue deserves special thought. For many years, the specter of human genetic engineering has haunted conservatives and liberals alike. Generally, their main criticisms run thus:

First, genetic engineering limits children’s autonomy to shape their own destinies. Writer Dinesh D’Souza articulates this position in a 2001 National Review Online article: “If parents are able to remake a child’s genetic makeup, they are in a sense writing the genetic instructions that shape his entire life. If my parents give me blue eyes instead of brown eyes, if they make me tall instead of medium height, if they choose a passive over an aggressive personality, their choices will have a direct, lifelong effect on me.” In other words, genetic enhancement is immoral because it artificially molds people’s lives, often pointing their destinies in directions that they themselves would not freely choose. Therefore, it represents a fundamental violation of their rights as human beings.

Second, some fear that genetic engineering will lead to eugenics. In a 2006 column, writer Charles Colson laments: “British medical researchers recently announced plans to use cutting-edge science to eliminate a condition my family is familiar with: autism. Actually, they are not ‘curing’ autism or even making life better for autistic people. Their plan is to eliminate autism by eliminating autistic people. There is no in utero test for autism as there is for Down syndrome…[Prenatal] testing, combined with abortion-on-demand, has made people with Down syndrome an endangered population…This utilitarian view of life inevitably leads us exactly where the Nazis were creating a master race. Can’t we see it?” The logic behind this argument is that human genetic enhancement perpetuates discrimination against the disabled and the “genetically unfit,” and that this sort of discrimination is similar to the sort that inspired the eugenics of the Third Reich.

A third argument is that genetic engineering will lead to vast social inequalities. This idea is expressed in the 1997 cult film Gattaca, which portrays a society where the rich enjoy genetic enhancements—perfect eyesight, improved height, higher intelligence—that the poor cannot afford. Therefore, the main character Vincent, a man from a poor background who aspires to be an astronaut, finds it difficult to achieve his goal because he is short-sighted and has a “weak heart.” This discrepancy is exacerbated by the fact that his brother, who is genetically-engineered, enjoys perfect health and is better able to achieve his dreams. To many, Gattaca is a dystopia where vast gaps between the haves and have-nots will become intolerable, due to the existence of not just material, but also genetic inequalities.

The critics are right that a world with genetic engineering will contain inequalities. On the other hand, it is arguable that a world without genetic engineering, like this one, is even more unequal. In Gattaca, a genetically “fit” majority of people can aspire to be astronauts, but an unfortunate “unfit” minority cannot. In the real world, the situation is the other way round: the majority of people don’t have the genes to become astronauts, and only a small minority with perfect eyesight and perfect physical fitness—the Neil Armstrong types—would qualify.

The only difference is that in the real world, we try to be polite about the unpleasant realities of life by insisting that the Average Joe has, at least theoretically, a Rocky-esque chance of becoming an astronaut. In that sense, our covert discrimination is much more polite than the overt discrimination of the Gattaca variety. But it seems that our world, where genetic privilege exists naturally among a tiny minority, could conceivably be less equal (and less socially mobile) than a world with genetic engineering, where genetic enhancements would be potentially available to the majority of people, giving them a chance to create better futures for themselves. Supporters of human genetic engineering thus ask the fair question: Are natural genetic inequalities, doled out randomly and sometimes unfairly by nature, more just than engineered ones, which might be earned through good old fashioned American values like hard work, determination, and effort?

“But,” the critics ask, “wouldn’t genetic engineering lead us to eugenics?” The pro-genetic engineering crowd thinks not. They suggest that genetic engineering, if done on a purely decentralized basis by free individuals and couples, will not involve any form of coercion. Unlike the Nazi eugenics program of the 1930s, which involved the forced, widespread killing of “unfit” peoples and disabled babies, the de facto effect of genetic engineering is to cure disabilities, not kill the disabled. This is a key moral difference. As pointed out by biologist Robert Sinsheimer, genetic engineering would “permit in principle the conversion of all the ‘unfit’ to the highest genetic level.” Too often, women choose to abort babies because pre-natal testing shows that they have Down syndrome or some other ailment. If anything, genetic engineering should be welcomed by pro-life groups because by converting otherwise-disabled babies into normal, healthy ones, it would reduce the number of abortions.

In addition, the world of Gattaca, for all its faults, features a world that, far from being defined along Hitler-esque racial lines, has in fact transcended racism. Being blond-haired and blue-eyed loses its racially elitist undertones because such traits are easily available on the genetic supermarket. Hair color, skin color, and eye color become a subjective matter of choice, no more significant than the color of one’s clothes. If anything, genetic engineering will probably encourage, not discourage, racial harmony and diversity.

It is true that genetic engineering may limit children’s autonomy to shape their own destinies. But it is equally true that all people’s destinies are already limited by their natural genetic makeup, a makeup that they are born with and cannot change. A short person, for example, would be unlikely to join the basketball team because his height makes it difficult for him to compete with his tall peers. An ugly person would be unable to achieve her dream of becoming a famous actress because the lead roles are reserved for the beautiful. A myopic kid who wears glasses will find it difficult to become a pilot. A student with an IQ of 75 will be unlikely to get into Harvard however hard he tries. In some way or another, our destinies are limited by the genes we are born with.

In this sense, it is arguable that genetic engineering might help to level the playing field. Genetic engineering could give people greater innate capacity to fulfill their dreams and pursue their own happiness. Rather than allow peoples’ choices to be limited by their genetic makeup, why not give each person the capability of becoming whatever he or she wants to, and let his or her eventual success be determined by effort, willpower, and perseverance? America has long represented the idea that people can shape their own destinies. To paraphrase Dr. King, why not have a society where people are judged not by the genes they inherit, but by the content of their character?

Looking at both sides, the genetic engineering controversy does raise questions that should be answered, not shouted down. Like all major scientific advances, it probably has some negative effects, and steps must be taken to ameliorate these outcomes. For example, measures should also be taken to ensure that genetic engineering’s benefits are, at least to some extent, available to the poor. As ethicists Maxwell Mehlman and Jeffrey Botkin suggest in their book Access to the Genome: The Challenge to Equality, the rich could be taxed on genetic enhancements, and the revenue from these taxes could be used to help pay for the genetic enhancement of the poor. To some extent, this will help to ameliorate the unequal effects of genetic engineering, allowing its benefits to be more equitably distributed. In addition, caution must be taken in other areas, such as ensuring that the sanctity of human life is respected at all times. In this respect, pro-life groups like Focus on the Family can take a leading role in ensuring that scientific advances do not come at the expense of moral ethics.

At the same time, we should not allow our fear of change to prevent our society from exploring this promising new field of science, one that promises so many medical and social benefits. A strategy that defines itself against the core idea of scientific progress cannot succeed. Instead of attempting to bury our heads in the sand, we should seek to harness genetic engineering for its positive benefits, even as we take careful steps to ameliorate its potential downsides.

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Principles of Genetic Engineering

Thomas m. lanigan.

1 Biomedical Research Core Facilities, Vector Core, University of Michigan, Ann Arbor, MI 48109, USA; ude.hcimu@tnaginal (T.M.L.); ude.hcimu@hgnohc (H.C.K.)

2 Department of Internal Medicine, Division of Rheumatology, University of Michigan, Ann Arbor, MI 48109, USA

Huira C. Kopera

3 Department of Human Genetics, University of Michigan, Ann Arbor, MI 48109, USA

Thomas L. Saunders

4 Biomedical Research Core Facilities, Transgenic Animal Model Core, University of Michigan, Ann Arbor, MI 48109, USA

5 Department of Internal Medicine, Division of Genetic Medicine, University of Michigan, Ann Arbor, MI 48109, USA

Genetic engineering is the use of molecular biology technology to modify DNA sequence(s) in genomes, using a variety of approaches. For example, homologous recombination can be used to target specific sequences in mouse embryonic stem (ES) cell genomes or other cultured cells, but it is cumbersome, poorly efficient, and relies on drug positive/negative selection in cell culture for success. Other routinely applied methods include random integration of DNA after direct transfection (microinjection), transposon-mediated DNA insertion, or DNA insertion mediated by viral vectors for the production of transgenic mice and rats. Random integration of DNA occurs more frequently than homologous recombination, but has numerous drawbacks, despite its efficiency. The most elegant and effective method is technology based on guided endonucleases, because these can target specific DNA sequences. Since the advent of clustered regularly interspaced short palindromic repeats or CRISPR/Cas9 technology, endonuclease-mediated gene targeting has become the most widely applied method to engineer genomes, supplanting the use of zinc finger nucleases, transcription activator-like effector nucleases, and meganucleases. Future improvements in CRISPR/Cas9 gene editing may be achieved by increasing the efficiency of homology-directed repair. Here, we describe principles of genetic engineering and detail: (1) how common elements of current technologies include the need for a chromosome break to occur, (2) the use of specific and sensitive genotyping assays to detect altered genomes, and (3) delivery modalities that impact characterization of gene modifications. In summary, while some principles of genetic engineering remain steadfast, others change as technologies are ever-evolving and continue to revolutionize research in many fields.

1. Introduction

Since the identification of DNA as the unit of heredity and the basis for the central dogma of molecular biology [ 1 ] that DNA makes RNA and RNA makes proteins, scientists have pursued experiments and methods to understand how DNA controls heredity. With the discovery of molecular biology tools such as restriction enzymes, DNA sequencing, and DNA cloning, scientists quickly turned to experiments to change chromosomal DNA in cells and animals. In that regard, initial experiments that involved the co-incubation of viral DNA with cultured cell lines progressed to the use of selectable markers in plasmids. Delivery methods for random DNA integration have progressed from transfection by physical co-incubation of DNA with cultured cells, to electroporation and microinjection of cultured cells [ 2 , 3 , 4 ]. Moreover, the use of viruses to deliver DNA to cultured cells has progressed in tandem with physical methods of supplying DNA to cells [ 5 , 6 , 7 ]. Homologous recombination in animal cells [ 8 ] was rapidly exploited by the mouse genetics research community for the production of gene-modified mouse ES cells, and thus gene-modified whole animals [ 9 , 10 ].

This impetus to understand gene function in intact animals was ultimately manifested in the international knockout mouse project, the purpose of which was to knock out every gene in the mouse genome, such that researchers could choose to make knockout mouse models from a library of gene-targeted knockout ES cells [ 11 , 12 , 13 ]. Thousands of mouse models have resulted from that effort and have been used to better understand gene function and the bases of human genetic diseases [ 14 ]. This project required high-throughput pipelines for the construction of vectors, including bacterial artificial chromosome (BAC) recombineering technology [ 13 , 15 , 16 , 17 ]. BACs contain long segments of cloned genomic DNA. For example, the C57BL/6J mouse BAC library, RPCI-23, has an average insert size of 197 kb of genomic DNA per clone [ 18 ]. Because of their size, BACs often carry all of the genetic regulatory elements to faithfully recapitulate the expression of genes contained in them, and thus can be used to generate BAC transgenic mice [ 19 , 20 ]. Recombineering can be used to insert reporters in BACs that are then used to generate transgenic mice to accurately label cells and tissues according to the genes in the BACs [ 21 , 22 , 23 , 24 , 25 , 26 ]. A panoply of approaches to genetic engineering are available for researchers to manipulate the genome. ES cell and BAC transgene engineering have given way to directly editing genes in zygotes, consequently avoiding the need for ES cell or BAC intermediates on the way to an animal model.

Prior to the adaptation of Streptococcus pyogenes Cas9 protein to cause chromosome breaks, three other endonuclease systems were used: (1) rare-cutting meganucleases, (2) zinc finger nucleases (ZFNs), and (3) transcription activator-like effector (TALE) nucleases (TALENs) [ 27 ]. The I-CreI meganuclease recognizes a 22 bp DNA sequence [ 28 , 29 ]. Proof-of-concept experiments demonstrated that the engineered homing endonuclease I-CreI can be used to generate transgenic mice and transgenic rats [ 30 ]. I-CreI specificity can be adjusted to target specific sequences in DNA by protein engineering methodology, although this limits its widespread application to genetic engineering [ 31 ]. Subsequently, ZFN technology was developed to cause chromosome breaks [ 32 ]. A single zinc finger is made up of 30 amino acids that bind three base pairs. Thus, three zinc fingers can be combined to specifically recognize nine base pairs on one DNA strand and a triplet of zinc fingers is made to bind nine base pairs on the opposite strand. Each zinc finger is fused to the DNA-cutting domain of the FokI restriction endonuclease. Because FokI domains only cut DNA when they are present as dimers, a ZFN monomer binding to a chromosome cannot induce a DNA break [ 32 ], instead requiring ZFN heterodimers for sequence-specific chromosome breaks. It is estimated that 1 in every 500 genomic base pairs can be cleaved by ZNFs [ 33 ]. Compared with meganucleases, ZFNs are easier to construct because of publicly available resources [ 34 ]. Additionally, the value of ZFNs in mouse and rat genome engineering was demonstrated in several studies that produced knockout, knockin, and floxed (described below) animal models [ 35 , 36 , 37 ]. The development of transcription activator-like effector nucleases (TALENs) followed after ZFN technology [ 38 ]. TALENs are made up of tandem repeats of 34 amino acids. The central amino acids at positions 12 and 13, named repeat variable di-residues (NVDs), determine the base to which the repeat will bind [ 38 ]. To achieve a specific chromosomal break, 15 TALE repeats assembled and fused to the FokI endonuclease domain (TALEN monomer) are required. Thus, one TALEN monomer binds to 15 base pairs on one DNA strand, and a second TALEN monomer binds to bases on the opposite strand [ 38 ]. When the FokI endonuclease domains are brought together, a double-stranded DNA break occurs. In this way, a TALEN heterodimer can be used to cause a sequence-specific chromosome break. It has been estimated that, within the entire genome, TALENs have potential target cleavage sites every 35 bp [ 39 ]. Compared with ZFNs, TALENs are easier to construct with publicly available resources [ 40 , 41 ], and TALENs have been adopted for use in mouse and rat genome engineering in several laboratories that have produced knockout and knockin animal models [ 42 , 43 , 44 , 45 , 46 ].

The efficiencies of producing specific double-strand chromosome breaks, using prior technologies such as meganucleases, ZFNs, and TALENs [ 28 , 32 , 38 ], were surpassed when CRISPR/Cas9 technology was shown to be effective in mammalian cells [ 47 , 48 , 49 ]. The essential feature that all of these technologies have in common is the production of a chromosome break at a specific location to facilitate genetic modifications [ 50 ]. In particular, the discovery of bacterial CRISPR-mediated adaptive immunity, and its application to genetic modification of human and mouse cells in 2013 [ 47 , 48 , 49 ], was a watershed event to modern science. Moreover, the introduction of CRISPR/Cas9 methodology has revolutionized transgenic mouse generation. This paradigm shift can be seen by changes in demand for nucleic acid microinjections into zygotes, and ES cell microinjections into blastocysts at the University of Michigan Transgenic Core ( Figure 1 ). While previously established principles of genetic engineering using mouse ES cell technology [ 51 , 52 , 53 ] remain applicable, CRISPR/Cas9 methodologies have made it much easier to produce genetically engineered model organisms in mice, rats, and other species [ 54 , 55 ]. Herein, we discuss principles in genetic engineering for the design and characterization of targeted alleles in mouse and rat zygotes, or in cultured cell lines, for the production of animal and cell culture models for biomedical research.

Recent trends in nucleic acid microinjection in zygotes, and embryonic stem (ES) cell microinjections into blastocysts, for the production of genetically engineered mice at the University of Michigan Transgenic Core. As shown, prior to the introduction of CRISPR/Cas9, the majority of injections were of ES cells, to produce gene-targeted mice, and DNA transgenes, to produce transgenic mice. After CRISPR/Cas9 became available, adoption was slow until 2014, when it was enthusiastically embraced, and the new technology corresponded to a reduced demand for ES cell and DNA microinjections.

2. Principles of Genetic Engineering

2.1. types of genetic modifications.

There are many types of genetic modifications that can be made to the genome. The ability to specifically target locations in the genome has expanded our ability to make changes that include knockouts (DNA sequence deletions), knockins (DNA sequence insertions), and replacements (replacement of DNA sequences with exogenous sequences). Deletions in the genome can be used to knockout gene expression [ 56 , 57 ]. Short deletions in the genome can be used to remove regulatory elements that knockout gene expression [ 58 ], activate gene expression [ 59 ], or change protein structure/function by changing coding sequences [ 60 ].

Insertion of new genomic information can be used to knock in a variety of genetic elements. Knockins are also powerful approaches for modifying genes. Just as genomic deletions can be used to change gene function, knockins can be used to block gene function by inserting fluorescent reporter genes such as eGFP or mCherry, in such a way as to knock out the gene at the insertion point [ 61 , 62 ]. It is also possible to knock in fluorescent protein reporter genes, without knocking out the targeted gene [ 63 , 64 ]. Just as fluorescent proteins can be used to label proteins and cells, short knockins of epitope tags in proteins can be used to label proteins for detection with antibodies [ 64 , 65 ].

Replacement of DNA sequences in the genome can be used to achieve two purposes at the same time, such as blocking gene function, while activating the function of a new gene such as the lacZ reporter [ 66 ]. Large-scale sequence replacements are possible with mouse ES cell technology, such as the replacement of the mouse immunoglobulin locus with the human immunoglobulin locus to produce a “humanized” mouse [ 67 ]. Furthermore, very small replacements of single nucleotides can be used to model point mutations that are suspected of causing human disease [ 68 , 69 , 70 ].

A special type of DNA sequence replacement is the conditional allele. Conditional alleles permit normal gene expression until the site-specific Cre recombinase removes a loxP-flanked critical exon to produce a “floxed” (flanked by loxP) exon. Cre recombinase recognizes 34 bp loxP (locus of recombination) elements, and catalyzes recombination between the two loxP sites [ 71 , 72 ]. Therefore, deletion of the critical exon causes a premature termination codon to occur in the mRNA transcript, triggering its nonsense-mediated decay and failure to make a protein [ 13 , 73 ]. Engineering conditional alleles was the approach used by the international knockout mouse project [ 13 ]. Mice with cell- and tissue-specific Cre recombinase expression are an important resource for the research community [ 74 ].

Other site-specific recombinases, such as FLP, Dre, and Vika, that work on the same principle have also been applied to mouse models [ 75 , 76 , 77 , 78 , 79 , 80 ]. Recombinase knockins can be designed to knock out the endogenous gene or preserve its function [ 81 , 82 ]. A variation in the conditional allele is the inducible allele, which is silent until its expression is activated by Cre recombinase [ 79 ]. For example, reporter models can activate the expression of a fluorescent protein [ 83 ], change fluorescent reporter protein colors from red to green [ 84 ], or use a combinatorial approach to produce up to 90 fluorescent colors [ 85 ]. Another type of inducible allele is the FLEX allele. FLEX genes are Cre-dependent gene switches based on the use of heterotypic loxP sites [ 86 ]. In one application that combined Cre and FLP recombinases, it was demonstrated that a gene inactivated in ES cells by a gene trap could be switched back on and then switched off again [ 87 ]. In another application of heterotypic loxP sites in mouse ES cells, it was demonstrated that genes could be made conditional by inversion (COIN) [ 88 ]. This application has been used to produce mice with conditional genes for point mutations [ 89 ] and has been applied to produce conditional single exon genes that lack critical exons by definition [ 90 ].

2.2. Genetic Engineering with CRISPR/Cas9

The central principle of gene targeting with CRISPR/Cas9, or other directed DNA endonucleases, is that a double-strand DNA break is generated in the cell of interest. Following a chromosomal break, the principal outcomes of interest are nonhomologous end joining (NHEJ) repair [ 91 ] or homology-directed repair (HDR) [ 92 ]. When the break is directed to a coding exon in a gene, the outcome of NHEJ is usually a small insertion or deletion of DNA sequence at the break (indel), causing frame shifts in mRNA transcripts that lead to premature termination codons, causing nonsense-mediated mRNA decay and loss of protein expression [ 73 ]. The HDR pathway copies a template during DNA repair, and thus the insertion of modified genetic sequences in the form of a DNA donor. This DNA donor can introduce new information into the genome flanked by homology arms on either side of the chromosome break. Typical applications of HDR include the use of genetic engineering to abrogate gene expression (gene knockouts), to modify amino acid codons (i.e.; point mutations), to replace genes with new genes (e.g.; knockins of fluorescent reporters, Cre recombinase, cDNA coding sequences), to produce conditional genes (floxed genes that are normally expressed until they are inactivated by Cre recombinase), to produce Cre-inducible genes (genes that are only expressed after Cre recombinase activates them), and to delete DNA from chromosomes (e.g.; delete regulatory elements that control gene expression, delete entire genes, or delete up to a megabase of chromosome segments). The simplest of these modifications is abrogation of gene expression. Multifunctional alleles, such as FLEX alleles, require the cloning or synthesis of multi-element plasmid DNA donors for HDR.

The processes of CRISPR/Cas9-mediated modifications of genes (gene editing) to produce a new cell line or animal model have in common a series of steps to achieve the final product. First, a gene of interest is identified and the final desired allele is specified. The next step is to identify single guide RNA(s) (gRNAs) that will be used to target a chromosomal break in one or more places. There are numerous online websites that can be used for this purpose [ 93 ]. One of the most up-to-date and versatile sites is CRISPOR ( http://crispor.tefor.net ) [ 94 ]. Interestingly, the authors provide evidence that the predictive powers of algorithms vary depending on whether they were based on the analysis of gRNAs delivered as RNA molecules, versus gRNAs delivered as U6-transcribed DNA molecules [ 94 ]. In any event, the selection of a gRNA target (20 nucleotides), adjacent to a protospacer-adjacent motif (PAM; NGG motif), should not be done without the aid of a computer algorithm that minimizes the possibility of off-target hits. After a gRNA target is identified, a decision is made to obtain gRNAs. While it is possible to produce in vitro-transcribed gRNAs, this may be inadvisable in so much as in vitro-transcribed RNAs can trigger innate immune responses and cause cytotoxicity in cells [ 95 ]. Chemically synthesized gRNAs using phosphorothioate modifications that improve gRNA stability may be preferable alternatives to in vitro-transcribed molecules [ 96 , 97 ]. With a gRNA in hand, a Cas9 protein is then selected. There are numerous forms of Cas9 that can be used for different purposes [ 98 ]. For practical purposes, we limit our discussion to Cas9 varieties that are on the market. A number of commercial entities sell wild-type Cas9 protein. When wild type Cas9 is used to target the genome with nonspecific guides, the frequency of off-target genomic hits, besides the desired Cas9 target, is very likely to increase [ 94 , 99 ]. Alternatives to the wild-type protein include enhanced specificity Cas9 from Sigma-Aldrich [ 100 ], and high-fidelity Cas9 from Integrated DNA Technologies [ 101 ]. In addition, there are other versions such as HF1 Cas9 [ 102 ], hyperaccurate Cas9 [ 103 ], and evolved Cas9 [ 104 ], all available in plasmid format from Addgene.org. As may be inferred from the names of these engineered Cas9 versions, they are designed to be more specific than wild type Cas9. Once the gRNAs and Cas9 protein are on hand, then it is a “simple” matter to combine them and deliver them to the target cell to produce a chromosome break and achieve a gene knockout by introducing premature termination codons or DNA sequence deletion of regulatory regions or entire genes.

2.3. Locus-Specific Genetic Engineering Vectors in Mouse and Rat Zygotes

The most challenging type of genetic engineering is the insertion (i.e.; knockin) of a long coding sequence to express a fluorescent reporter protein, Cre recombinase, or conditional allele (floxed gene). In addition to these genetic modifications, numerous other types of specialized reporters can be introduced, each designed to achieve a different purpose. There is great interest in achieving rapid and efficient gene insertions of reporters in animal models with CRISPR/Cas9 technology. It is generally recognized that, the longer the insertion, the less efficient it is to produce a knockin animal. Additional challenges are allele-specific differences that affect efficiency. For example, it is fairly efficient to produce knockins into the genomic ROSA26 locus in mice, while other loci are targeted less efficiently, and thus refractory to knockins. This accessibility to CRISPR/Cas9 complexes mirrors observations in mouse ES cell gene targeting technology, in which it was reported that some genes are not as efficiently targeted as others [ 105 ].

When the purpose of the experiment is to specifically modify the DNA sequence by changing amino acid codons, or introducing new genetic information, then a DNA donor must be delivered to the cells with Cas9 reagents. After the selected gRNAs and Cas9 proteins are demonstrated to produce the desired chromosome break, the DNA donor is designed and procured. The donor should be designed to insert into the genome such that it will not be cleaved by Cas9, usually by mutating the PAM site. The DNA donor may take the form of short oligonucleotides (<200 nt) [ 106 , 107 ], long single-stranded DNA molecules (>200 nt) [ 108 ], or double-stranded linear or circular DNA molecules of varying lengths [ 109 , 110 ].

DNA donor design principles should include the following: (1) nucleotide changes that prevent CRISPR/Cas9 cleavage of the chromosome, after introduction of the DNA donor; (2) insertion of restriction enzyme sites unique to the donor, to simplify downstream genotyping; (3) insertions of reporters or coding sequences, at least 1.5 kb in length, that can be introduced as long single-stranded DNA templates with short 100 base pair arms of homology [ 111 ], or as circular double-stranded DNA plasmids with longer (1.5 or 2 kb) arms of homology [ 63 , 110 ]; and (4) insertions of longer coding sequences, such as Cas9, that use circular double-stranded DNA donors with longer arms of homology [ 63 , 112 ]. It is also possible to use linear DNA fragments as donors [ 63 , 110 , 113 ], although random integration of linear DNA molecules is much higher than those of circular donors, thus requiring careful quality control.

The establishment of genetically modified mouse and rat models can be divided into three phases, after potential founder animals are born from CRISPR/Cas9-treated zygotes. In the first phase, animals with genetic modifications are identified. The first phase requires a sensitive and specific genotyping assay to identify cells or animals harboring the desired knockin. Genotyping potential founder mice for knockins typically begins with a PCR assay using a primer that recognizes the exogenous DNA sequence and a primer in genomic DNA outside of the homology arm in the targeting vector. Accordingly, PCR assays are designed to specifically detect the upstream and downstream junctions of the inserted DNA in genomic DNA. Subsequent assays may be used to confirm that the entire exogenous sequence is intact. Conditional genes represent a special case of insertion, as PCR assays designed to detect correct insertion of loxP-flanked exons will also detect genomic DNA [ 108 ]. In the second phase, founders are mated and G1 pups are identified that inherited the desired mutation [ 114 ]. In the third phase, it is essential to sequence additional genomic regions upstream and downstream of the inserted targeting vector DNA, because Cas9 is very efficient at inducing chromosomal breaks, but has no repair function. Thus, it is not unusual to identify deletions/insertions that flank the immediate vicinity of the Cas9 cut site or inserted targeting vector DNA sequences [ 115 , 116 ]. If such deletions affect nearby exons, gene expression can be disrupted, and confounding phenotypes may arise.

For gene knockouts, PCR amplicons from primers that span the chromosome break site are analyzed by DNA sequencing. Any animals that are wild-type at the allele are not further characterized or used, so as to prevent any off-target hits from entering the animal colony or confounding phenotypes. Animals that show disrupted DNA sequences at the Cas9 cut site are mated with wild-type animals for the transmission of mutant alleles that produce premature termination codons, for gene knockout models [ 57 , 73 ]. As founders from Cas9-treated zygotes are genetic mosaics [ 55 , 115 ], it is essential to mate them to wild-type breeding partners, such that obligate heterozygotes are produced. In the heterozygotes, the wild-type sequence and the mutant sequence can be precisely identified by techniques such as TOPO TA cloning (Invitrogen, CA, USA) or next-generation sequencing (NGS) methods [ 117 , 118 , 119 , 120 ]. Animals carrying a defined indel, with the desired properties, are then used to establish lines for phenotyping. The identical approach is used when short DNA sequences are deleted by two guide RNAs [ 58 ]. Intercrossing mosaic founders will produce offspring carrying two different mutations with different effects on gene expression. These animals are not suitable for line establishment.

2.4. Gene Editing in Immortalized Cell Lines

CRISPR/Cas9 gene editing in immortalized cell lines presents a set of challenges unique from those used in the generation of transgenic animals. Cell lines encompass a wide range of characteristics, resulting in each line being handled differently. Some of these characteristics include phenotype heterogeneity, aberrant chromosome ploidy, varying growth rates, DNA damage response efficiency, transfection efficiency, and clonability. While the principles of CRISPR/Cas9 experimental design, as stated above, remain the same, three major considerations must be taken into account when using cell lines: (1) copy number variation, or the number of alleles of the gene of interest; (2) transfection efficiency of the cell line; and (3) clonal isolation of the modified cell line. In cell lines, all alleles need to be modified in the generation of a null phenotype, or in the creation of a homozygous genotype. Unlike transgenic animals, where single allele gene edits can be bred to homozygosity, CRISPR/Cas9-edited cells must be screened for homozygous gene edits. Copy number variations within the cell line can decrease the efficiency and add labor and time (i.e.; editing 3 or 4 copies versus editing 1 or 2). Furthermore, an aberrant number of chromosomes, deletions, duplications, pseudogenes, and repetitive regions complicate genetic backgrounds for PCR analysis of the CRISPR edits. To help with some of these issues, one common approach is to use NGS on all the clonal isolates for a complete understanding of copy number variations for each clonal cell line generated, and the exact sequence for each allele.

As all cell types are not the same, different CRISPR/Cas9 delivery techniques may need to be tested to identify which method works best. One approach is to use viruses or transposons to deliver CRISPR/Cas9 reagents (detailed below). However, the viruses and transposons themselves will integrate into the genome, as well as allowing long-term expression of CRISPR/Cas9 in the cell. This prolonged expression of gRNAs and Cas9 protein may lead to off-target effects. Moreover, transfection and electroporation can have varying efficiencies, depending on the cell lines and the form of CRISPR/Cas9 reagents (e.g.; DNA plasmids or ribonucleoprotein particles (RNPs)).

Following delivery, clonal isolation is required to identify the edited cell line, and at times, can result in the isolation of a cell phenotype different than that expected, arising from events apart from the desired gene edit. While flow cytometry can aid in isolating individual cells, specific flow conditions, such as pressure, may require adjustment to ensure cell viability. Furthermore, one clonal isolate from a cell line may possess a different number of alleles for the targeted gene than another clonal isolate. Additionally, not all cell lines will grow from a single cell, thus complicating isolation. Growth conditions and cell viability can also change when isolating single cells.

Despite these challenges, new advances in CRISPR technology can likely alleviate some of these difficulties when editing cell lines. For example, fluorescently tagged Cas9 and RNAs help to isolate only transfected cells, which helps to eliminate time wasted on screening untransfected cells. Cas9-variants that harbor mutations that only create single-strand nicks (Cas9-nickases) complexed with two different, but proximal gRNAs can increase HDR-mediated knockin [ 48 , 121 ]. Similarly, fusing Cas9 with base-editing enzymes can also increase the efficiency of editing, without causing double-strand breaks [ 121 ].

2.5. Viruses and Transposons as Genetic Engineering Vectors

Viral and transposon vectors have been engineered to be safe, efficient delivery systems of exogenous genetic material into cells. The natural lifecycle of some viruses and transposons includes the stable integration into the host genome. In the field of genome engineering, these vectors can be used to modify the genome in a non-directed fashion, by inserting cassettes expressing any cDNA, shRNA, miRNA, or any non-coding RNA. The most widely used vectors capable of integrating ectopic genetic material into cells are retroviruses, lentiviruses, and adeno-associated virus (AAV). These viruses are flanked by terminal repeats that mark the boundaries of the integration. In engineering these viruses into recombinant vector systems, all the viral genes are removed from the flanking terminal repeats and supplied in trans for the recombinant virus to be packaged. These “gutted”, nonreplicable viral vectors allow for the packaging, delivery, integration, and expression of cDNAs of interest, shRNAs, and CRISPR/Cas9, without viral replication in various biological targets.

Similar to recombinant viruses, transposon vectors are also “gutted”, separating the transposase from the terminal repeat-flanked genetic material to be inserted into the genome. DNA transposons are mobile elements (“jumping genes”) that integrate into the host genome through a cut-and-paste mechanism [ 122 ]. Transposons, much like viral vectors, are flanked by repeats that mark the region to be transposed [ 123 ]. The enzyme transposase binds the flanking DNA repeats and mediates the excision and integration into the genome. Unlike viral vectors, transposons are not packaged into viral particles, but form a DNA-protein complex that stays in the host cell. Thus, the transgene to be integrated can be much larger than the packaging limits of some viruses.

Two transposons, Sleeping Beauty (SB) and piggybac (PB), have been engineered and optimized for high activity for generating transgenic mammalian cell lines [ 124 , 125 , 126 ]. Sleeping Beauty is a transposable element resurrected from fish genomes. The SB system has been used to generate transgenic HeLa cell lines, T-cells expressing chimeric antigen receptors that recognize tumor-specific antigens, and transgenic primary human stem cells [ 127 , 128 , 129 ]. The insect-derived PB system also has been used to generate transgenic cell lines [ 126 , 130 , 131 ]. The PB system was used to generate induced pluripotent stem cells (iPSCs) from mouse embryonic fibroblasts, by linking four or five cDNAs of the reprogramming (Yamanaka) factors [ 132 ] with intervening peptide self-cleavage (P2A) sites, thus delivering all of the factors in one vector [ 130 ]. Furthermore, once reprogrammed, the transgene may be removed by another round of PB transposase activity, leaving no genetic trace of integration or excision (i.e.; transgene-free iPSCs). Following PB transposase activity, epigenetic differences remaining at the endogenous promoters of the reprogramming factor genes result in sustained expression and pluripotency, despite transgene removal.

Aside from transgene insertion, Sleeping Beauty (SB) and piggyback (PB) have both been engineered to deliver CRISPR/Cas9 reagents into cells [ 133 , 134 , 135 ]. Similar to lentivirus, the stable integration of CRISPR/Cas9 by transposons could increase the efficacy of targeting and modifying multiple alleles. SB and PB have been used to deliver multiple gRNAs to target multiple genes (instead of just one), aiding in high-throughput screening. Furthermore, owing to the nature of PB excision stated above, the integrated CRISPR/Cas9 can be removed once a clonal cell line is established, to limit off-target effects. However, engineered transposons must be transfected into cells. As stated above, efficiencies vary between different cell lines and transfection methods. One potential solution to overcome this challenge is to merge technologies. For example, instead of transfecting cells with a plasmid harboring a gRNA flanked by SB terminal repeats (SB-CRISPR), the SB-CRISPR may be flanked by recombinant AAV (rAAV) terminal repeats (AAV-SB-CRISPR), allowing for packaging into rAAV. To that end, rAAV-SB-CRISPR has been used to infect primary murine T-cells, and deliver the SB-CRISPR construct [ 136 ].

2.6. Genetic Engineering Using Retroviruses

Retroviruses are RNA viruses that replicate through a DNA intermediate [ 137 ]. They belong to a large family of viruses including both onco-retroviruses, such as the Moloney murine leukemia virus (MMLV) (simply referred to as retrovirus), and lentiviruses, including human immunodeficiency virus (HIV). In all retroviruses, the RNA genome is flanked on both sides by long terminal repeats (LTRs); packaged with viral reverse transcriptase, integrase, and protease, surrounded by a protein capsid; and then enveloped into a lipid-based particle [ 138 ]. Envelope proteins interact with specific host cell surface receptors to mediate entry into host cells through membrane fusion. Then, the RNA genome is reverse-transcribed by the associated viral reverse transcriptase. The proviral DNA is then transported into the nucleus, along with viral integrase, resulting in integration into the host cell genome [ 139 ]. By contrast, the retroviral MMLV pre-integration complex is incapable of crossing the nuclear membrane, thus requiring the cell to undergo mitosis to gain access to chromatin [ 139 ], while lentiviral pre-integration complexes can cross nuclear membrane pores, allowing genome integration in both dividing and non-dividing cells.

Large-scale assessments of genomic material composition have uncovered features associated with retroviral insertion into mammalian genomes [ 140 ]. Although determination of integration target sites remains ill-defined, it does depend on both cellular and viral factors. For retroviruses such as MMLV, integration is preferentially targeted to promoter and regulatory regions [ 140 , 141 , 142 ]. Such preferences can be genotoxic owing to insertional activation of proto-oncogenes in patients undergoing gene therapy treatments for X-linked severe combined immunodeficiency [ 143 , 144 ], Wiskott–Aldrich syndrome [ 143 ], and chronic granulomatous disease [ 145 ]. Likewise, retroviral integration can generate chimeric and read-through transcripts driven by strong retroviral LTR promoters, post-transcriptional deregulation of endogenous gene expression by introducing retroviral splice sites (leading to aberrant splicing), and retroviral polyadenylation signals that lead to premature termination of endogenous transcripts [ 142 , 146 , 147 ].

Unlike retroviruses, lentiviruses prefer to integrate into transcribed portions of expressed genes in gene-rich regions, distanced from promoters and regulatory elements [ 140 , 142 , 148 ]. The cellular protein LEDGF/p75 aids in the target site selection by binding directly to both the active gene and the viral integrase within the HIV pre-integration complex [ 149 ]. Although the propensity of lentivirus to integrate into the body of expressed genes should increase the incidence of post-transcriptional deregulation, deletion of promoter elements from the lentiviral LTR (self-inactivating (SIN) vectors) has been reported to decrease transcriptional termination, but increase the generation of chimeric transcripts [ 149 ]. Overall, it appears that lentiviral SIN vectors are less likely to cause tumors than retroviral vectors with an active LTR promoter [ 148 , 150 , 151 , 152 ].

The 7.5–10 kb packaging limit of lentiviruses can accommodate the packaging, delivery, and stable integration of Cas9 cDNA, gRNAs, or Cas9 and gRNAs (all-in-one) to cells [ 153 , 154 ]. Often, a selectable marker, such as drug resistance, can also be included to isolate transduced cells. The high transduction efficiency of lentivirus can result in an abundance of CRISPR/Cas9-expressing cells to screen, compared with more traditional transfection methods. Stable and prolonged expression of CRISPR/Cas9 can facilitate targeting of multiple alleles of the gene of interest, resulting in more cells harboring homozygous gene modifications. Conversely, stable integration of CRISPR/Cas9 increases potential off-target effects. Moreover, lentiviral integration itself is a factor that may confound cellular phenotypes and should be considered when characterizing CRISPR-edited cell lines.

2.7. Gene Targeting Using Adeno-Associated Virus

Adeno-associated virus (AAV) is a human parvovirus with a single-stranded DNA genome of 4.7 kb, which was originally identified as a contaminant of adenoviral preparations [ 155 ]. The genome is flanked on both sides by inverted terminal repeats (ITR) and contains two genes, rep and cap [ 156 , 157 ]. Different capsid proteins confer serotype and tissue-specific targeting of distinct AAVs, in vivo. AAV cannot replicate on its own, and requires a helper virus, such as adenovirus or herpes simplex virus (HSV), to provide essential proteins in trans. AAV is the only known virus to integrate into the human genome in a site-specific manner at the AAVS1 site on chromosome 19q13.3-qter [ 158 , 159 , 160 ]. Although the precise mechanism is not well understood, the Rep protein functions to tether the virus to the host genome through direct binding of the AAV ITR and the AAVS1 site [ 158 , 160 , 161 ]. In the recombinant AAV (rAAV) vector system, the rep and cap genes are removed from the packaged virus, resulting in the loss of site-specific integration into the AAVS1 site. Despite removal of Rep, it has been shown that rAAV can still integrate, albeit randomly, into the host genome, via nonhomologous recombination, at low frequencies [ 162 , 163 , 164 ]. Furthermore, numerous clinical trials, to date, have shown that rAAV integration is safe and has no genotoxicity [ 165 , 166 , 167 ]. However, this “safety” is controversial, owing to preclinical studies suggesting genotoxicity in mouse models [ 168 , 169 , 170 , 171 ]. More studies are needed to understand the cellular impact of rAAV integration.

rAAVs have been used to deliver one or two CRISPR guide RNAs (gRNAs), in cells and model animals, by taking advantage of different rAAV serotypes to target specific cells or tissue types. Owing to the packaging capacity of rAAV, SpCas9 must be delivered as a separate virus, unlike lentivirus, which can be delivered as an “all-in-one” CRISPR/Cas9 vector. However, alternate, smaller Cas9s can be packaged into rAAVs [ 172 ]. Furthermore, rAAVs can be used to deliver repair templates or single-stranded donor oligonucleotides (ssODNs) for homology-directed repair (HDR), relying on the single-stranded nature of the AAV genome [ 173 , 174 ]. It has also been observed that rAAVs can integrate into the genome at CRISPR/Cas9-induced breaks in various cultured mouse tissue types, including neurons and muscle [ 175 ]. This observation goes against the notion of rAAVs integrating only at the AAVS1 locus, and should be considered when analyzing and characterizing rAAV-mediated CRISPR-edited cells.

3. Conclusions

There are many approaches to inserting new genetic information into chromosomes in cells and animals. At this time, the most appealing method is single copy gene insertion at a defined locus. This approach has numerous advantages, with respect to reproducible transgene expression. Random insertion transgenesis has been effectively used to probe gene function in mouse models [ 176 ]. It is generally accepted that this requires a spontaneous chromosome break [ 176 ]. Recent NGS data suggest that the repair mechanism resembles chromothripsis [ 118 , 177 ]. In addition to unintended gene disruptions owing to chromosome damage, the random insertion of transgenes exposes them to “position effects” in which their expression is controlled by neighboring genes [ 118 , 178 ]. Ideally, the insertion of reporter cDNAs in the genome results in single copy transgene insertions in defined loci in such a way that endogenous genes are not disrupted, and reporters are placed under the control of specific endogenous promoters [ 179 ]. The application of CRISPR/Cas9 technology to address this problem shows it can be used to achieve these goals [ 63 , 82 , 180 ]. The development of CRISPR/Cas9 base editing technology shows that it is possible to make single-nucleotide changes in the genome [ 181 , 182 , 183 , 184 ]. Base editors have the advantage that double-strand chromosome breaks are not produced, thus lessening the chances of undesirable mutations in the genome. A novel approach to small insertions in the genome by the use of a RNA donor sequence fused to the sgRNA in combination with a reverse transcriptase fused to dead Cas9 also avoids the need to produce double-strand breaks on chromosomes. This approach is referred to as “prime editing” [ 185 ]. CRISPR technology that avoids chromosome breaks, while making changes to the genome, is extremely important in clinical applications where unintended changes can adversely affect patients. These advanced versions of CRISPR technology will be important for future research.

The desire to apply CRISPR/Cas9 for the targeted insertion of transgenes is reflected in the profusion of methods directed towards this purpose [ 63 , 108 , 110 , 112 , 186 , 187 ]. Each method was successfully used to engineer mouse and rat genomes ( Table 1 ). Each method was shown to be more cost-effective and rapid than the application of mouse or rat ES cell technology. For the practitioner of the art, the question remains: which method is most efficient? That is to say, which method minimizes the number of animals needed for zygote production and maximizes the number of gene-targeted founders? One approach to this question is to compare the transgenic efficiency of each method [ 188 ]. The results in Table 1 show that the highest efficiency experiments were obtained when long single-stranded DNA donors and Cas9 ribonucleoproteins were used to produce genetically engineered mice. All methods are very effective compared with traditional methods of gene targeting in zygotes. Perhaps future avenues to even more efficient gene targeting lie in the application of small molecule activators for HDR [ 189 , 190 , 191 ].

Analysis of targeting vector knockin by CRISPR/Cas9 in mouse and rat zygotes.

1 Conditional: A critical exon was flanked by loxP sites, so as to produce a Cre-dependent knockout allele. Reporter: an exogenous coding sequence, such as for a fluorescent protein, was inserted. 2 RNP: ribonucleoprotein; Cas9 protein was complexed with guide RNA. Cas9 mRNA: in vitro transcribed mRNA from a plasmid containing Cas9 mixed with guide RNA. Cas9-mSa: in vitro transcribed mRNA from a plasmid containing Cas9 fused to monomeric streptavidin. 3 ssDNA: single-stranded DNA repair template. BioPCR: PCR was used to prepare biotinylated PCR amplicons. dsDNA: circular double-stranded DNA repair template. HMEJ: homology-mediated end joining; circular double-stranded DNA repair template incorporating sgRNA targets that flank homology arms. Tild: linear double-stranded DNA repair template. AAV: an adeno-associated vector donor was cultured with zygotes loaded with Cas9 RNP, by electroporation. 4 Efficiency, as calculated as the number of genetically engineered mice or rats produced per 100 zygotes treated with CRISPR/Cas9 reagents and transferred to pseudopregnant females.

Author Contributions

Conceptualization, T.L.S. Writing—review and editing, T.M.L.; H.C.K.; and, T.L.S. All authors have read and agreed to the published version of the manuscript.

This research was supported by Institutional Funds from the University of Michigan Biomedical Research Core Facilities.

Conflicts of Interest

The authors declare no conflict of interest.

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Genetic Engineering Essay Guide With 70 Hot Topics

Genetic engineering has been a subject of heated debate. You will find many essays on genetic engineering, asking you to debate for or against, discuss its ethical implications, or emerging congenital disease.

With all these at hand, you may be tempted to opt-out immediately. However, this top-notch guide seeks to make genetics essay writing as fun and as straightforward as possible. Ride along to see the magic!

What Is An Essay on Genetic Engineering?

Now, genetic engineering in itself is the use of biotechnology to manipulate an organism’s genes directly. Therefore, essays on genetics will require students to explore the set of technologies used to change cells’ genetic makeup. These include the transfer of genes within and across species boundaries to produce novel or improved organisms.

We have various areas of genetic engineering, such as:

• Human genetic engineering definition: Deals with genetic engineering techniques applied to humans
• Genetic engineering in plants: Concentrates on genetically modified plant species

Genetic engineering is mostly applied in medicine and thus its technicality. I know this is a field that most students approach with reverence and uttermost humility. Nonetheless, it doesn’t have to be that way. The next few lines might change your opinion on genetic engineering forever!

Why is genetic engineering necessary?

Importance of Genetic Engineering

It is essential in the following ways:

• Ensures that seed companies can protect modified seed varieties as intellectual property.
• Leads to production o organisms with better traits
• Helps maintain the ecosystem

You can see why this field is unavoidable regardless of the negative talk behind it.

Genetically Engineering Plants and Animals – Essay Sample

Young in practice, a little over forty years old, genetic engineering has provided the scientific community with an abundance of knowledge once thought absurd. Genetic engineering means deliberately changing the genome of an organism to acquire some desired traits during its cultivation. On the whole, genetic engineering has a multitude of advantages and disadvantages when it comes to using it on animals and plants; the most prominent advantages include disease resistance, increased crop yields, and a decrease in need for pesticides and antibiotics, whereas disadvantages include the potential for emergence of stronger pathogens, as well as various unexpected consequences. This current paper discusses the pros and cons of using genetic engineering on plants, animals, and provides a synthesis, arguing that, despite its disadvantages, it still serves as a pivotal advantage not only within the scientific community, but also society.

The Advantages of Using Genetic Engineering

The impact of genetic engineering on society can be seen at various aspects, affecting various aspects of social and physical organic life, especially in terms of human beings. The practice consists of the specific selection and removal of genes from organic organisms and inserting them into another. The practice, though still young in practice and not yet deemed completely socially acceptable, makes the possibility of curing diseases once thought incurable a reality, thereby inherently improving the life of both humans and non-human animals. It has many positive effects on society, an example being in Uganda bananas, a main source of caloric intake, are susceptible to the emergence of new diseases that affects their production because of the disease’s potency. Ugandan scientists have successfully used a genetic modification, inserting a pepper gene into bananas, which prevents the fruit from getting the disease (Bohanec, 2015). Furthermore, through genetic engineering, tissue, skin cells, and other forms of organic matter can be grown and used in replacing damaged, worn, or malfunctioning organs and tissues thereby prolonging human life and benefiting their quality of life. The practice helps better advance both the scientific and medical field, both of which are essential in discovering how to better life on Earth.

Genetic engineering, as previously mentioned, can be used to grow and replace damaged tissue or organs, aiding in the betterment and prolonging of human life; it can cure diseases once though incurable, an example being AIDS and cancer. Millions of people around the world suffer from AIDS and cancer, both posing a severe risk to the overall health of the person. More than 900,000 lives were taken by AIDS in 2017 (UNAIDS, 2018). Similarly, over 600,000 were taken by cancer in the following year (NIH, 2018). Genetic engineering makes the possibility of eradicating these diseases a reality. In theory, genetic engineering can help those who suffer from these diseases live longer, healthier, fuller lives by eradicating the disease in its entirety. Though it would not be an easy feat, nor a cheap one, it could still help further advance and better human life and prolong the human life span. People would no longer live in fear of dying from these prolific diseases. Furthermore, genetic engineering, despite the naysayers and opposers of the practice, is another step in organic evolution. From plants to animals, the practice has the chance to achieve strides within scientific history that can greatly benefit the planet in its entirety. From eliminating hunger, to eradicating once prolific diseases, genetic engineering can provide a better, longer, and higher quality of life and tackle bounds once thought impossible the scientific community.

Genetically engineered plants and animals may provide a wide array of benefits that might be pivotal for humanity in the modern world. These benefits include the possibility of developing such plant cultivars that would be resistant to a wide variety of pathogens and diseases caused by microorganisms such as viruses (Ginn, Alexander, Edelstein, Abedi, & Wixon, 2013). If such plant cultivars are created, it might become unnecessary to use chemicals in order to battle these plant diseases. This is clearly a major benefit, since it means better preserving the natural environment and avoiding the use of chemicals that may contaminate soils and waters, as well as kill wildlife.

The Disadvantages of Using Genetic Engineering

The use of genetic engineering to alter plants and animals used in agriculture and husbandry may also have a variety of adverse consequences. For instance, it should be noted that high rates of resistance to disease might have a serious flip side. More specifically, the pathogenic microorganisms (such as bacteria and viruses) can usually mutate quickly in order to adapt to the new conditions. This means that if new cultivars or breeds of plants or animals with high resistance to diseases are created, the pathogens may adapt to these changes in their “hosts” and turn stronger, thus becoming capable of infecting the new cultivars or breeds (Ayres, n.d.). This might again necessitate the use of chemicals or antibiotics; only now stronger drugs or pesticides would be needed. In addition, the old cultivars or breeds may also become infected by the new microorganism strains, and these strains will probably cause more severe diseases in the “original” plants and animals and will be more difficult to cure or prevent.

Another negative possibility is accidentally creating some invasive species that may harm the local ecosystems. For instance, if new plants are made in such a manner that the local species of animals cannot eat them, and then humans lose control over their growth, the new plants may pose a danger to the original plants growing in the given ecosystem, therefore disrupting the ecosystem. For example, in 1984 a patch of seaweed labelled as Caulerpa taxifolia was bred with another robust strain of seaweed identified by scientists as Caulerpa taxifolia (Vahl) C. Agandh . The initial objective was to breed an aquarium plant, however, after a sample escaped in 1984 into the Mediterranean Sea, being found off the coast of both the United States and Australia in 2000, it was found that the strain’s taste was subpar to marine wild life. It was eventually poisoned by the California state government to avoid further damage to marine life and the marine ecosystem and was consequently outlawed by hundreds of countries. The World Conservation Union named it one of the 100 World’s Worst Invasive Alien Species, despite it being manmade (Cellania, 2008).

Finally, there is always the risk of “going too far” when practicing genetic engineering (Bruce & Bruce, 2013). Indeed, it should be noted that the humanity has used various methods of cultivation for millennia in order to breed for specific traits. For example, in 1956, Warwick Kerr, a Brazilian geneticist, imported an aggressive breed of African honeybee to breed with a European species to aid in the decreasing bee population epidemic. Provoked by even the smallest of instigation, after over 26 swarms of the aggressive bee escaped from the apiary in Sao Paulo, they wreaked havoc in North and South America, found in the United States in the early 90s. Nevertheless, genetic engineering is a fast and radical method to change organisms, and very little, if any, data is available to predict the potential adverse impacts of its utilization. It may be difficult to tell when (if at any point) one must stop the process of genetic engineering to avoid unexpected adverse influences of its utilization.

Genetic engineering, despite its disadvantages, can help progress humanity in ways that once seemed impossible. With the environmental and physical epidemics surrounding the planet, the practice can serve as a benefit to resolving the hunger crisis, the preservation of endangered plant and animal species, bringing certain species back from extinction, and so much more. It should be stressed that the utilization of biotechnology and genetic engineering may bring a wide array of significant benefits, which may be of great use to the humanity nowadays. The creation of breeds and cultivars which are immune to disease, resistant to harsh environmental conditions, are cheap to grow, and provide better nutritional value for people might be extremely helpful in reducing the amount of chemicals, pesticides, and antibiotics needed to grow these animals or plants, and, consequently, to help preserve the environment. However, it should also be remembered that genetic engineering might have a wide array of adverse impacts, such as the emergence of new, stronger pathogens, the creation of invasive species, and a multitude of negative consequences that no one knew to expect.

Genetic Engineering Essay Structure

A top-rated genetic engineering essay comes in the manner outlined below:

• Genetic engineering essay introduction: Provide context for your paper by giving a well-researched background on the subject of discussion. Include the thesis statement which will provide the direction of your writing.
• Body: Discuss the main points in detail with relevant examples and evidence from authentic and reliable sources. You can use diagrams or illustrations to support your argument if need be.
• Genetic engineering conclusion: Finalize your paper with a summative statement and a restatement of the thesis statement while showing the genetic engineering process’s implication. Does it add any value to society?

Armed with this great treasure of knowledge, you are good to begin writing your paper. However, we have quality genetic engineering essay topics from expert writers to start you off:

Interesting Genetic Engineering Persuasive Essay Topics

• How human curiosity has led to new advancements and technologies in genetics
• History of genetically modified food
• Discuss the process of genetic engineering in crops
• Evaluate the acceptance of genetically modified crops worldwide
• Analyze the leading countries implementing genetic engineering
• Does genetic engineering produce a desired characteristic?
• What are the legal implications of genetic engineering
• The role of scientists in making the world a better place
• Why coronavirus is a game-changer in the field of genetic engineering
• The effectiveness of genetic engineering as a course in college

Great Topics on the Disadvantages of Genetic Engineering in Humans

• Why changing the sequence of nucleotides of the DNA affects human code structure
• Impact of genetic engineering human lifespans
• Genetic engineering and population control
• Ethical questions to consider in human genetic engineering
• Unintended side effects on humans
• Increasing the risk of allergies
• The foundation of new weapon technologies
• Disadvantages of trait selection before birth
• The greater risk of stillbirth
• Why ladies are at risk with genetic engineering

Why is Genetic Engineering Good Essay Topics

• Genetic engineering and disease prevention
• The creation of a healthy and better society
• Production of drought-resistant crops
• Crop pollen spreads further than expected
• Survival of human species
• Birth of healthy children with desirable traits
• Solving food insecurity problems globally
• Elimination of fertility issues for couples
• Medical advancements as a result of genetic engineering
• Reducing the prevalence of schizophrenia and depression

Good Genetic Engineering Topics

• The development of genetic engineering in the modern world
• Application of ethics in genetic engineering
• Societal class versus genetic engineering
• Impact of genetic engineering on natural selection and adaptation
• Detection of toxins from GMO foods
• Social effects of genetic engineering
• Why people are becoming increasingly resistant to antibiotics
• How gene editing affects the human germline
• Medical treatment opportunities in genetic engineering
• The relationship between molecular cloning and genetic engineering

Impressive Genetic Engineering Research Paper Topics

• Impact of genetic engineering on food supply
• The taste of GMO food versus ordinary food
• GMOs and their need for environmental resources
• Why genetic engineering may face out the use of pesticides
• Reduced cost of living and longer shelf life.
• Growth rates of plants and animals
• Application of genetic engineering on soil bacteria
• New allergens in the food supply
• Production of new toxins
• Enhancement of the environment for toxic fungi

Latest Genetic Engineering Ideas

• The discovery of vaccines through genetic engineering
• Biological warfare on the rise
• Change in herbicide use patterns
• Mutation effects in plants and animals
• Impact of gene therapies
• Does genetic engineering always lead to the desired phenotype?
• Genetic engineering in mass insulin production
• Role of genetic engineering in human growth hormones
• Treating infertility
• Development of monoclonal antibodies

Pro and Cons of Genetic Engineering in Humans Topic Ideas

• Possibility of increased economic inequality
• Increased human suffering
• The emergence of large-scale eugenic programmes
• Rise of totalitarian control over human lives
• The concentration of toxic metals in genetic engineering
• Creation of animal models of human diseases
• Using somatic gene therapy on Parkinson’s disease
• Production of allergens in the food supply
• Redesigning the world through genetic engineering
• Bioterrorism: A study of the issue of emerging infectious diseases

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Home — Essay Samples — Science — Genetic Engineering — Exploring the Pros and Cons of Genetic Engineering

Exploring The Pros and Cons of Genetic Engineering

• Categories: Engineering Genetic Engineering

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Words: 571 |

Published: Feb 7, 2024

Words: 571 | Page: 1 | 3 min read

Table of contents

Introduction, pros of genetic engineering, cons of genetic engineering, regulation of genetic engineering.

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Essays on Genetic Engineering

Do you want help with your genetic engineering essay? If so, you can check out our samples below or give over your essay assignment completely. The topic of genetic engineering is not easy. Genetic engineering essays define the subject as a set of techniques, methods, and technologies for isolating genes from an organism, performing manipulations with said genes, and introducing them into other organisms. Genetic engineering is a tool of biotechnology. It uses methods of molecular and cell biology, cytology, genetics, microbiology, and virology. Authors of essays on genetic engineering note that, unlike traditional selection, during which an organism undergoes changes in its own genome through mutations, genetic engineering allow you to change the genome by introducing desired genes into it, including completely foreign ones. You can learn more from genetic engineering essay samples below!

Advancements in Genomic Sciences Advancements in genomic sciences have opened up more opportunities than ever before. Scientists have gained a better understanding of heritable genetic conditions, and are continuously developing methods of controlling or eradicating them. Although genetic experiments have so far focused on animal test subjects, human trials are showing...

Words: 1812

Genetic engineering, also known as genetic modification, is the procedure used to produce genetically modified organisms (GMOs). (Kruft n.p.). Different species of plants that are thought to be drought, pest, and herbicide resistant are frequently produced as a result of the procedure. In 1972, the first GMO was created. (Millis...

Words: 2712

The Dangers of Genetic Engineering The twenty-first century has brought about significant changes in human life, primarily as a result of advances in genetic engineering. Today's changes are the result of computer revolutions, which have enabled scientists to make significant advances in gene research. Fundamentally, the changes in how information is...

Words: 2214

Unprecedented Technological Advancements Unprecedented technological advancements and achievements characterize this generation. The human race has been influenced by genetic engineering, space travel, and the internet. The advanced weapons that humans have produced, such nuclear bombs, have made these breakthroughs much more dangerous to human existence than they were in earlier eras....

Words: 1238

Genetically Modified Organisms (GMOs)Genetically modified organisms (GMOs) are creatures that have undergone changes for the benefit of the species as a whole. One major advantage of GMOs is that through engineering, it is feasible to obtain better, healthier foods with longer shelf lives because it is possible to modify the...

Introduction Media, scientists, and governmental agencies have all expressed interest in and opinions about the use of genetic engineering and biotechnology. There are no definitive solutions to the question of what lies ahead for genetically engineered creatures. Organisms that have had their genetic makeup altered by genetic engineering are referred to...

Words: 1107

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The Process of RNA Interference The process of RNA interference is the suppression of gene expression by little RNA fragments. The approach was first identified in the 1990s by observations of the transcriptional hindrance caused by the expression of antisense RNA in the transgenic plants. Additionally, the information from studies carried...

Friday by Robert A. Heinlein is a novel about a genetically modified human named Friday Baldwin who is an artificial being. Friday acts as a self-sufficient "war messenger" for a clandestine private entity that is part spy agency, part militia organization, and part think tank. She is an artificial human...

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The Question of Genetic Predispositions The question of whether two individuals with identical genetic predispositions will have the same characteristics and traits appears to be unending. The advent of several scientific theories that place character and personality at the center of genetic lineage appears to have sparked this debate. Indeed, a...

Genetic modification is the effective use of modern molecular biology and technologies to introduce new and beneficial characteristics or superior traits into world beings. Gene science, according to Lindahl and Linder (2013), is a valuable instrument of a research method in which attractive qualities from a single organism's Deoxyribonucleic acid...

Words: 1506

Researchers also created a genetic modification strategy that allows bacteria that are drug-resistant to be deemed drug-susceptible for the first time. This strategy of combating antibiotic resistance seems to be less expensive than other recent drug discovery methods. At the moment, scientists will use biosynthetic bacteria machines to produce antibiotics...

A genetically modified organism (GMO) A genetically modified organism (GMO) is a microbe, animal, or plant whose genome has been modified by a genetic modification technique. In agriculture, GMOs are typically designed to exhibit hybrid characteristics, especially enhanced commodity shelf life, tolerance to harsh weather conditions, pests and herbicides, and increased...

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Essay on Genetic Engineering

Students are often asked to write an essay on Genetic Engineering in their schools and colleges. And if you’re also looking for the same, we have created 100-word, 250-word, and 500-word essays on the topic.

Let’s take a look…

100 Words Essay on Genetic Engineering

What is genetic engineering.

Genetic engineering is a science field where experts change the genetic material in a living thing. They do this to make the living thing better in some way. This could be making a plant resistant to pests or making an animal grow bigger.

How does Genetic Engineering work?

Scientists use special tools to cut and paste genes, which are parts of DNA. DNA is like a recipe book for making a living thing. By changing the genes, scientists can change the recipe. This can make plants stronger or animals healthier.

Uses of Genetic Engineering

Genetic engineering is used in many areas. It can help make better crops that are resistant to pests or drought. It can also help in medicine, by making bacteria that produce human insulin for diabetics.

Controversies around Genetic Engineering

Some people worry about genetic engineering. They fear it could be used in wrong ways, like making ‘designer babies’. There are also worries about genetically modified (GM) food. Some people fear it could harm our health or the environment.

Future of Genetic Engineering

The future of genetic engineering is exciting. It could help solve big problems like hunger, disease, and climate change. But, it’s important we use it wisely. We need rules to make sure it’s used for good, not harm.

250 Words Essay on Genetic Engineering

Genetic Engineering is like a magic trick in science. It is a way for scientists to change the genes in living things. Genes are like a recipe that tells our bodies how to work. They decide our hair color, eye color, and even if we might get sick with certain diseases. By changing these genes, scientists can make living things better or different.

How Does Genetic Engineering Work?

Think of genetic engineering like a puzzle. Scientists take a piece (a gene) from one living thing and put it into another. This can give the second creature new abilities. For example, scientists have put genes from a fish that lives in very cold water into a tomato. This makes the tomato able to live in cold weather too!

Genetic engineering is used in many ways. It can make food crops stronger and healthier. It can also help to make medicine. For example, scientists have used it to create insulin, a medicine for people with diabetes.

Is Genetic Engineering Good or Bad?

Genetic engineering can do a lot of good, but it can also be dangerous. Changing genes can have unexpected results. For instance, a genetically modified plant might harm other plants or animals. Also, some people worry that it is not right to change nature in this way.

In conclusion, genetic engineering is a powerful tool. It can help us in many ways, but we must be careful. Like any tool, it must be used wisely.

500 Words Essay on Genetic Engineering

Genetic engineering is a branch of science that allows scientists to change the DNA of plants, animals, and humans. DNA is like a set of instructions that tell our bodies how to grow and work. By changing these instructions, scientists can make living things stronger, healthier, or even create new kinds of life.

Genetic engineering works by using special tools to cut and paste pieces of DNA. It’s a bit like editing a movie. Just as a movie editor can cut and paste scenes to make a film, a genetic engineer can cut and paste pieces of DNA to make a new kind of life.

The process starts with the DNA of a living thing. This DNA is cut into pieces using a special tool called an enzyme. Then, a piece of DNA from another living thing is pasted in. The new piece of DNA is chosen because it has a trait that the scientist wants to add. For example, a scientist might add a piece of DNA that makes a plant resistant to pests.

Genetic engineering has many uses. In medicine, it can be used to create new medicines or to make existing ones more effective. For example, scientists have used genetic engineering to create a kind of bacteria that produces insulin, a hormone that helps control blood sugar. This has made it easier for people with diabetes to get the insulin they need.

In agriculture, genetic engineering is used to create crops that are stronger and more resistant to diseases. This can help farmers grow more food and reduce the use of harmful pesticides.

Concerns About Genetic Engineering

While genetic engineering has many benefits, there are also concerns. Some people worry that changing the DNA of a living thing could have unexpected consequences. For example, a genetically modified plant might spread its new genes to wild plants, creating superweeds that are hard to control.

There are also ethical concerns. Some people believe that changing the DNA of a living thing is playing God and goes against nature.

In conclusion, genetic engineering is a powerful tool that can bring many benefits. However, it’s important that we use this tool wisely. We need to understand the possible risks and make sure that we respect the natural world as we use this technology. By doing this, we can ensure that genetic engineering is used for the good of all.

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Home / Essay Samples / Science / Biology / Genetic Engineering

Genetic Engineering Essay Examples

The success of gene therapy in curing genetic disorders.

Gene therapy is the process by which genes can be used to treat or prevent future disease. Human gene therapy began approximately three decades ago, in the 1970’s genetic engineering first became possible through the use of recombinant DNA technology; however, difficulties were noted during...

Benefits of GM Food to Combat Starvation in the Third World Countries

With genetic engineering, genetically modified foods (GM foods) are produced by inserting new genes into an organism’s original DNA. This can improve the quality and quantity of food. It has therefore been suggested to solve the problem of famine in the Third World, which concerns...

Genetically Engeering in Eysium and Gattaca

A huge worry in society today is whether we should be genetically engineering ourselves. Are we crossing the lines when it comes to this dilemma? Genetic engineering is something so impactful that it could make a huge difference to the entire world, but will this...

Genetically Modified Crops and Its Impact on Human Health

People have been naturally genetically modifying plants for thousands of years. While this hasn't caused any adverse health issues in humans, it is proven that genetically modified crops and their consumption have shown traces of some unwanted health issues. Although genetic engineering is a common...

Pest Control in Commercial Agriculture

Research in biological pest management in agroecosystems and general plant crops is one of the essential parts of ensuring a viable crop yield as well as sustainability of the crop field and the surrounding environment. Involving myself in specialized research with pests that cause substantial...

Advantages and Disadvantages of Genetically Modified Organisms (gmos)

Genetically Modified Organisms (GMOs) GMOs are transgenic organisms carrying foreign genes either from virus, bacteria, plants, humans in order to improve their genetic structure for particular purposes. In this procedure the beneficial or gene of interest is identified which is then isolated and multiplied and...

Synchronization of Flowering in Cocoa

Cocoa production – an industry valued at upwards of $6 billion annually – is an important source of income for 5 million smallholder farmers in developing countries throughout the tropics (World Cocoa Foundation, 2018). The agricultural production systems undergirding this industry, however, face a number...

The Safety of GM Foods for Human Consumption

Genetically modified (GM) foods have been proven to be a reliable option in an ever expanding world in helping to alleviate world food shortages. Genetically modified foods first appeared in the 1930s and with the advancement of technology, they have proven consistently to be superior...

Rasgrf2 and Gene Transfer Mechanisms

The gene RASGRF2 codes for a protein involved in neuron signalling, including the dopamine reward pathways of the brain. Previous research has shown that at least the "RASGRF2 rs26907" variant is associated with binge drinking and mice engineered to have their version of the same...

Application of Genetic Engeniering to Help Cure Parkinson's Disease

How can genetic engeniering help cure Parkinson's disease? The Parkinson's disease ended many lives, plenty of people have suffered from this disease. The Parkinson disease is a genetically inherited disease, Parkinson's disease is a progressive nervous system disorder that affects movement. Symptoms start gradually, sometimes...

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About Genetic Engineering

Genetic engineering, also called genetic modification or genetic manipulation, is the modification and manipulation of an organism's genes using technology. It is a set of technologies used to change the genetic makeup of cells.

Genetic engineering is the science of manipulating genetic material of an organism. The first artificial genetic modification accomplished using biotechnology was transgenesis, the process of transferring genes from one organism to another, first accomplished by Herbert Boyer and Stanley Cohen in 1973. It was the result of a series of advancements in techniques that allowed the direct modification of the genome.

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