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Targeted gene knockout using CRISPR/Cas9 requires the use of a delivery system to introduce the sgRNA and Cas9 into the cell. Although a number of different delivery systems are potentially available for CRISPR, [ 37 ] [ 38 ] genome-wide loss-of-function screens are predominantly carried out using third generation lentiviral vectors.
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]
Cas9 (or "CRISPR-associated protein 9") is an enzyme that uses CRISPR sequences as a guide to recognize and open up specific strands of DNA that are complementary to the CRISPR sequence. Cas9 enzymes together with CRISPR sequences form the basis of a technology known as CRISPR-Cas9 that can be used to edit genes within living organisms.
CRISPR-based gene knockout is a powerful tool for understanding the genetic basis of disease and for developing new therapies. It is important to note that CRISPR-based gene knockout, like any genetic engineering technique, has the potential to produce unintended or harmful effects on the organism, so it should be used with caution.
Cas9 (CRISPR associated protein 9, formerly called Cas5, Csn1, or Csx12) is a 160 kilodalton protein which plays a vital role in the immunological defense of certain bacteria against DNA viruses and plasmids, and is heavily utilized in genetic engineering applications.
"Multiplexed CRISPR/Cas9 gene knockout with simple crRNA:tracrRNA co-transfection". Cell & Bioscience. 9: 41. doi: 10.1186/s13578-019-0304-0. PMC 6528186. PMID 31139343. Nishimasu, Hiroshi; Nureki, Osamu (2017). "Structures and mechanisms of CRISPR RNA-guided effector nucleases". Current Opinion in Structural Biology. 43: 68– 78.