Attn:
Subcommittee Head
Subcommittee for Research on Genetically Modified Organisms
Genetic Modification Advisory Committee
CC:
Deputy Head
Senior Analysts
Dear Professor,
Internal report on Crispr Cas9 regarding genome editing experiments
Thanks to the advances in technology, there is a new DNA recombination method called “Clustered Regularly Interspaced Short Palindromic Repeats“, CRISPR for short.
About Crispr
Crispr is based on a natural system used by the bacteria to protect themselves from the infection by viruses. When the bacterium detects the presence of a viral DNA, it produces 2 types of short RNA. One of which contains a sequence that matches that of the invading viral DNA. These 2 RNAs form a complex protein called Cas9. Cas9 is a nuclease, a type of enzyme that can cut DNA. When the matching sequence, known as the guide RNA, finds the target within the viral genome, the Cas9 cuts the target DNA, disabling the virus. But this procedure can be used for any DNA sequence at a precise location by changing the guide RNA to match the
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I would like to take this opportunity to discuss and draw out guidelines for proceeding in harnessing this new technology without having to cause a panic among the public.
I would like to strictly state that first off, this report strongly discourages any attempts at human germline genome modification for clinical application. This does still leave open a question about ex vivo human embryos. Some people consider them human beings. I believe as long as the embryo is not transferred to a human recipient to develop to a baby, it is still feasible in terms of morality.
Furthermore, I don’t think that engineered human germline modification would be a big issue for several
The Gene Hackers published by the New Yorker’s Michael Specter talks about a breakthrough technology that could allow for the creation of genetically modified humans- “humans 2.0” as he calls it. This new technology could also be the cure for many genetic disorders like Alzheimer’s, Huntington’s etc. as it would allow scientist the ease of genetically identifying and editing specific genes responsible for these genetic abnormalities. This exciting new technology will be known as Clustered Regularly Interspaced Short Palindromic Repeats associated protein 9 or CRISPR-Cas 9 for short.
The FDA has commented at this task at hand, and they praised the idea. However, the FDA did state that they can't use funds to review anything that has to do with human embryos being created. The FDA then said that because of this they could not conduct any research on this, in the United States, at the time. This entire idea will come down to the FDA, and right now it does not look good for the people who want it
I agree with Dr. Collin's stance because modifying the genetics of a person takes away their natural god given rights. Those modifyed humans would have no say in how they
The current applications of CRISPR have improved thoroughly since the first days of transgenic creations, and now with the help of the previously mentioned transgenic organisms, CRISPR has been created. CRISPR is currently being used in a variety of ways, whether it be through adaptation to severe weather, or even through creating medication to cure previously incurable diseases. There are no lengths
Ryland F. Young III’s article, “Secret Weapon,” begins by explaining the efficiency of CRISPR defense. Bacteria’s are infected by bacteriophages 1030 times a day. Bacteriophages mutate and undergo an unfathomable amount of genomic recombination that makes it difficult for bacteria to defend themselves from these viruses. Scientist discovered a new bacteria defense systems called CRISPR. This process in combination restriction-modification, restriction enzymes and apoptosis allows bacteria to protect themselves from invading viruses. CRISPR defense is effective because it forced bacteriophages to undergo intense recombination shuffling down to a scale of the size of CRISPR spaces, instead of just mutating. Though CRISPR defense is an effective
New technological advances and scientific methods continue to change the course of nature. One of the current controversial advances in science and technology is the use of genetically modified embryos in which the study exceeds stem cell research. Scientists have begun planning for research involving human embryos in the genetic modification field. Many technological developments are responsible for improving our living standards and even saving lives, but often such accomplishments have troubling cultural and moral ramifications (Reagan, 2015). We are already beyond the days in which virtually the only procreative option was for a man and a woman to conceive the old-fashioned way (Reagan, 2015). Genetic modification of human embryos can be perceived as a positive evolution in the medical process yet it is surrounded by controversy due to ethical processes. Because this form of genetic modification could affect later born children and their offspring, the protection of human subjects should be a priority in decisions about whether to proceed with such research (Dresser, 2004). The term Human Genetic Engineering was originally made public in 1970. During this time there were several methods biologists began to devise in order to better identify or isolate clone genes for manipulation in several species or mutating them in humans.
Although highly controversial, I find germline editing extremely interesting. Just the thought of removing a gene from an embryo is fascinating. In the article they used an enzyme called CRISPR/Cas9 as their scissors in order to cut out the faulty gene, which could’ve lead to heart failure. This genetic editing could potentially save thousands, perhaps millions of people from heart problems. When injected with the CRISPR/Cas9, a RNA strand to direct the cut, and an added piece of DNA to help repair the cell. During this process something interesting happened. The embryo rejected the added DNA and healed itself using the healthy copy of its mother’s DNA. This posed many questions for me. One of the major questions I had was, are designer babies possible? Can someone choose what features their child gets? By continuing my research into this topic I found out that although it would be extremely difficult there is a slight chance that designer babies are possible. Although this possibility is very small and would take
Three types of CRISPR mechanisms, the most studied type II, have been described. In Type II, DNA is infected from viruses or plasmids, subdivided into small pieces, and incorporated into a CRISPR locus between a series of short repeats (about 20 bps). The loci are transcribed
In theory, CRISPR is an extreme method of gene editing and gene editing has been around for years on end. It has been used on plants to make them a more sustainable crop. CRISPR technology has not yet been perfected to be accessible to everyone. Yet the first clinical crispr trial happened in October of 2016, Michael Le Page tells us that in the first clinical trial of CRISPR being used "Doctors removed immune cells from the blood of a person with lung cancer, used CRISPR to disable a gene called PD-1 and then returned the cells to the body," the results of the trial are said to not be released until 2018 (Le Page 1).
Figure 1: Overview of the CRISPR-Cas system – it shows the adaptive immunity with the use of viral DNA (3);
Genetics has reached the point where a mutated gene is replaced with a beneficial gene. CRISPR, or Clustered Regulatory Interspaced Short Palindromic Repeats, is a gene editing tool that can be the cure to genetic diseases. CRISPR was discovered by Francisco Mojica in 2007 while doing research on bacteria (Zhang 2017). The best way to describe CRISPR’s function is it works like spell check. CRISPR can find “typos” in the DNA sequence and modify the sequence (Zhang 2017). CRISPR’s discovery has been a breakthrough in the complicated problem that is fighting genetic disorders. CRISPR will lead to new ways of combating genetic disorders and lead to a permanent solution to a serious problem.
In recent years it has been found that prokaryotes, mainly bacteria and Achaea, contain an immune system that allows them to defend themselves against the nucleic acids that are integrated by viral genomes. Therefore, this discovery was made by studying the genomes of bacterial cells; which shed light on the clustered regularly interspaced short palindromic repeats (CRISPR) identified in many bacterial genomes. Therefore, the identification of CRISPR was first discovered in 1987 but its function was unknown at the time. However, the significance of these genetic elements came into light in the early 2000s as they began to be identified in a number of prokaryotes. Furthermore, it was later established that these short spaces
Humans have been genetically engineering organisms for nearly 10,000 years using traditional methods of modification—among these methods include selective breeding and crossbreeding. Though effective, these methods were unreliable and were only able to change certain traits. A lack of control over our genetic material proved to be a clear hindrance to our species; when harnessed, advancements in other fields of knowledge would be immeasurable. Once seen as an impossible task, scientists have been able to exploit genes and take control of them. CRISPR-Cas9 is a system that allows scientists to cleave off sections of DNA and artificially modify them by inserting a mutation into the place of the old DNA. This is exceptionally precise, whilst
Next, it utilizes crRNA, and tracrRNA (two RNA forms that direct Cas9). Later, Cas9 (the DNA separating enzyme), will be guided by these RNA strands. It would then locate specific target DNA sequences and replace them (via a cutting process) with new modified threads of DNA, while removing the [old, bad] DNA (Ma, Zhang & Huang, 2014, p.5187). Zoe Corbyn a writer of The Guardian, reports that Crispr edited sequences include a personalized molecule (referred to as RNA threads in Wu article), which allow space for more artificial sets of DNA to help create a more beneficial set of genetics (Corbyn, 2015, p.2). A regular DNA sequence would include various disease-infested germ-lines, from available hereditary genetics.
In 2012, it was discovered by Jinek et al [1], that a piece of RNA along with the Cas9 nuclease could be used to make cuts at any place in the DNA sequence. The greatest advantage of this method is that it is very easy to engineer pieces of RNA corresponding to the DNA sequence to be cut. Also, the Cas9 nuclease is easy to produce. This method provides a cheap, quick and easy way to make genetic changes in cells, and accelerate genetic research in the laboratory.