We know that technology is advancing at an ever-increasing pace. This is also true in the world of biology and genetics. In this case, many people don't know what CRISPR is or what it's used for. It's a gene-editing technique that, in short, cuts and pastes genes. It was discovered quite some time ago and is already showing promise in the treatment of various diseases and ailments.
In this article, we'll tell you what CRISPR is, what its characteristics are, and how this type of technology is used in genetics and biology.
What is CRISPR
CRISPR is an acronym for Clustered Regularly Interspaced Short Palindromic Repeats. This is a mechanism that bacteria use to defend themselves against viruses and other mobile genetic elements that try to invade their cells.
The way CRISPR works is very interesting. First, bacteria incorporate fragments of viral DNA into their own DNA, as a kind of "immunological memory ." These fragments are called spacers. Then, when a virus tries to infect a bacterial cell, the bacterium produces guide RNA that binds to a protein complex called Cas, which cuts and destroys the viral DNA. The guide RNA is created from the information contained in the spacers, allowing the bacterium to "remember" the viruses it has encountered previously.
This form of bacterial immune defense has been used to develop highly precise gene-editing tools. The most popular technique is CRISPR-Cas9 , which uses a modified version of the Cas9 protein to cut DNA at a specific location. Changes can then be made to the DNA, such as adding or deleting genes or correcting mutations.
Advantages of CRISPR technology
The great advantage of CRISPR technology is its precision. Guide RNA can be designed to bind to a specific DNA sequence, meaning editing is only done at the desired location. Furthermore, the technique is much faster and cheaper than previous gene editing techniques.
While CRISPR technology is quite promising, it also raises ethical and safety questions. Gene editing could be used to cure genetic diseases, but it could also be used to create "designer" babies or to make germline changes that are passed on to future generations. Furthermore, errors in the editing process could have unpredictable consequences, such as causing cancer or other diseases. Many people discuss it as being more like "playing God."
Gene editing
In nature, organisms have genetic information that controls their growth. Gene editing is a group of techniques that can be used to alter an organism's DNA for different purposes. It is important to note that editing is not the same as genetic modification. First of all, DNA from other species is not used, as in the modification.
Biogenetics, also known as genetic engineering, is a discipline that combines biology and genetics, with applications in the field of biotechnology. Gene editing is a process by which the piece of DNA targeted for modification is detected , removed, and replaced with a new piece. It is also possible that, once the problematic fragments are removed, the cell's machinery takes over and repairs the sequence itself. With these techniques, scientists can add, remove, or change DNA as needed to achieve their desired objectives.
Thus, CRISPR is an innovative gene-editing technology that relies on the ability of Cas proteins to cleave DNA in the presence of the appropriate recognition RNA. Since RNA can be synthesized in the lab, the editing possibilities are nearly limitless.
Main uses
CRISPR technology is used to introduce changes into the genome with extreme precision. In its main application we have the following:
- medical applications, as trials to eliminate HIV or to treat diseases such as Duchenne muscular dystrophy, Huntington's disease, autism, progeria, cystic fibrosis, triple-negative cancer, or Angelman syndrome. Research is also trying to determine whether it could be used as a diagnostic test to detect
- Fights infectious diseases transmitted by insectssuch as malaria, zika, dengue, chikungunya or yellow fever.
- Vegetal biotechnology. CRISPR technology can be used to produce plant varieties that are better adapted to the environment, resistant to drought or pests, which is related to research on seeds that resist climate changeOrganoleptic properties, including physicochemical properties, can be modified to make them more suitable for human consumption.
In animal technology, it can be used to introduce species improvements, for example to create herds resistant to typical diseases. Currently, there are no CRISPR technologies approved to treat diseases caused by a single gene that could theoretically be cured through this gene editing. For this reason, medical applications are more of a theoretical than a practical domain and currently have an experimental basis.
CRISPR and bioethics
CRISPR gene-editing technology presents several bioethical challenges. While its main applications are positive, certain obstacles can be overcome by making this cost-effective technology available to everyone.
As for gene editing applications in primary industry, agriculture and livestock, they are positive as long as they are intended to be beneficial to humans. Of course, it is necessary to analyze each case separately. For example, manipulating plant species to make them resistant to pests is of enormous human interest.
On the other hand, if we consider interventions in ecosystems, we must be more cautious, since any unexpected change could lead to serious or uncontrollable problems.
In terms of medical applications, the use of gene-editing technology in humans requires very high safety guarantees and can only be used for diseases for which there is currently no effective treatment, or for diseases that currently have significant side effects. Finally, gene editing of embryos is not justified from a scientific or ethical standpoint.