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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.
Cas9 uses cell-specific promoters allowing a controlled use of the Cas9. Cas9 is an accurate method of treating diseases due to the targeting of the Cas9 enzyme only affecting certain cell types. The cells undergoing the Cas9 therapy can also be removed and reintroduced to provide amplified effects of the therapy. [133]
Developed from a natural defense mechanism found in bacteria, CRISPR-Cas9 is the most commonly used system. Gene editing with CRISPR-Cas9 involves a Cas9 nuclease and an engineered guide RNA, which come together to allow for the precise "cutting" of one or both strands of DNA at specific locations within the genome. [179]
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Type-II CRISPR systems [7] are characterized by the single signature nuclease Cas9. [8] In type-II CRISPR systems crRNA and tracrRNA (trans-activating CRISPR RNA) can form a complex known as the guide RNA or gRNA. [9] The crRNA within the gRNA is what matches up with the target sequence or protospacer after the PAM is found. Once the match is ...
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But Cas9 will not cleave the protospacer sequence unless there is an adjacent PAM sequence. The spacer in the bacterial CRISPR loci will not contain a PAM sequence, and thus will not be cut by the nuclease, but the protospacer in the invading virus or plasmid will contain the PAM sequence, and thus will be cleaved by the Cas9 nuclease. [4]