CRISPR gRNAs

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A cartoon showing a simplified Cas9 and gRNA binding to DNA. The 3’ end of the gRNA is the scaffold sequence, bound by Cas9, where some DNA substitution is tolerated. The 20 bases on the 5’ end of the gRNA are the spacer sequence, which hybridizes with the genomic DNA, base pairing to the target strand.   The non-target strand of genomic DNA includes the same sequence as the spacer. The PAM consists of the three bases immediately 3’ of this spacer-matching sequence.  Within the gRNA spacer, the 3’ half is the seed sequence, where no DNA substitution is tolerated. The 5’ half, also the 5’ end of the entire gRNA, is the tail sequence, where DNA substitution is tolerated.
A cartoon overlayed on several crystal structures showing the parts of the prime editor: the Cas9 nickase domain, the reverse transcriptase domain, and the pegRNA.
screenshot of various PRIDICT webpages
Stabilizing gRNA Modifications
comic of illustrating Cas protein binding a gRNA and target DNA. The Cas protein is labelled CasM(onster) and looks like cookie monster. It has a quote bubble that says
GoldenGate
Custom CRISPR Scren Schematic.png
Figure 1.png

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