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CRISPR-Cas9 genome editing techniques have many potential applications. The use of the CRISPR-Cas9-gRNA complex for genome editing [10] was the AAAS's choice for Breakthrough of the Year in 2015. [11] Many bioethical concerns have been raised about the prospect of using CRISPR for germline editing, especially in human embryos. [12]
Designing an appropriate gRNA is an important element of genome editing with the CRISPR/Cas system. A gRNA can and at times does have unintended interactions ("off-targets") with other locations of the genome of interest.
[9] [10] This editing process has a wide variety of applications including basic biological research, development of biotechnological products, and treatment of diseases. [11] [12] The development of the CRISPR-Cas9 genome editing technique was recognized by the Nobel Prize in Chemistry in 2020 awarded to Emmanuelle Charpentier and Jennifer ...
The approach utilises the CRISPR-Cas9 gene editing system, coupled with libraries of single guide RNAs (sgRNAs), which are designed to target every gene in the genome. Over recent years, the genome-wide CRISPR screen has emerged as a powerful tool for performing large-scale loss-of-function screens, with low noise, high knockout efficiency and ...
Furthermore, Fanzor could potentially be used for genome editing in eggs and sperm [2] for disease prevention and infertility treatment. However, the intervention in such cells' DNA comes with risks and requires strict ethical guidelines. [9] One major advantage of Fanzor in comparison to the CRISPR/Cas9 system is its small size.
Cas9 has been used often as a genome-editing tool. Cas9 has been used in recent developments in preventing viruses from manipulating hosts' DNA. Since the CRISPR-Cas9 was developed from bacterial genome systems, it can be used to target the genetic material in viruses. The use of the enzyme Cas9 can be a solution to many viral infections.
CRISPR/Cas9 edits rely on non-homologous end joining (NHEJ) or homology-directed repair (HDR) to fix DNA breaks, while the prime editing system employs DNA mismatch repair. This is an important feature of this technology given that DNA repair mechanisms such as NHEJ and HDR, generate unwanted, random insertions or deletions (INDELs).
It is far less effective at gene correction. Methods of base editing are under development in which a “nuclease-dead” Cas 9 endonuclease or a related enzyme is used for gene targeting while a linked deaminase enzyme makes a targeted base change in the DNA. [69] The most recent refinement of CRISPR-Cas9 is called Prime Editing.
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