Making CRISPR Plasmids Using Fragmid

By Rachel Leeson

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Overview of the parts of CRISPR. The bacterial chromosome encodes a tracrRNA (in some systems including Cas9), Cas proteins, and a CRISPR array. The CRISPR array is composed of identical repeat sequences and variable spacer sequences. The array is transcribed and processed into crRNAs, each including one repeat and one spacer. In bacteria, these crRNAs are bound by Cas proteins (Cas9 shown here). The repeat sequence base pairs with the tracrRNA, and the spacer sequence is used to target complementary DNA sequences. In laboratory settings, an sgRNA includes the crRNA and tracrRNA sequences in a “single-guide RNA” that performs both functions. Cas9 cuts both the target and nontarget DNA strands upstream of the PAM site found in the nontarget strand.
screenshot of various PRIDICT webpages
Cartoon summary of Cas9 activity.
Graphic representation of the FITS screening process
Addgene CRISPR distribution and deposits. (A) Cumulative CRISPR plasmids shipped by year. (B) Cumulative CRISPR plasmids deposited with Addgene by year. (C) Cumulative number of laboratories that have deposited CRISPR plasmids by year. (D) Cumulative CRISPR pooled libraries shipped by year.

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