CRISPR-Cas9 genome editing learning path

CRISPR-Cas9 as a genome modification technique

CRISPR-Cas9 is a genome modification (gene-editing) technique that allows scientists to change the DNA of living organisms. It is adapted from a bacterial immune defense system and works by delivering the Cas9 nuclease together with a synthetic guide RNA (gRNA) into cells. The guide RNA directs Cas9 to a specific DNA sequence, where Cas9 makes a cut (“genetic scissors”), enabling researchers to remove existing genes or insert new ones in vivo. After the DNA break, the cell repairs the cut using either homology-directed repair (HDR) for “knock-in” changes (using an added repair template to insert desired DNA) or end-joining pathways such as non-homologous end joining (NHEJ) and POLQ/TMEJ for “knock-out” mutations. These repair processes can produce targeted disruptions, including random small insertions or deletions that can disable gene function. CRISPR-Cas9 is widely valued for being precise, efficient, and relatively cost-effective, and it has major applications in biotechnology, medicine, agriculture, and research, including potential treatments for inherited diseases and cancers—though germline use in humans is controversial. Variants and alternative CRISPR nucleases have also been developed to improve targeting and reduce off-target effects.

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Cas9 cutting DNA at a chosen location

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