The Addgene Blog

Master plasmid fundamentals, CRISPR techniques, AAV serotype selection, and antibody applications. Written by scientists, for scientists.

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Cartoon of four cells, with a different plasmid in each. A zoom panel shows the interior of the cells, where Cas9 uses a library sgRNA to cut a matching genomic target. Each plasmid has a different genomic target. An arrow labeled “screen for different outcomes” points to the four cells with the target genes knocked out, indicated with an X. Three cells are gray while one remains the same color, representing a different phenotype after knockout.
Diagram comparing six CRISPR-Cas genome editing tools—Cas9 and Cas12a nucleases, base editors, prime editors, transcriptional modulators, and RNA editors—showing how each protein-RNA complex binds DNA or RNA and the type of edit it produces.
A partial CRISPR prime editing schematic cartoon. The parts of the prime editor and pegRNA are indicated. The prime editor consists of a Cas9n H840A nickase fused to a reverse transcriptase (RT), while the pegRNA includes spacer, scaffold, RT template, and primer binding site (PBS) sequences. The desired edit is part of the RT template. In the first step, these components form a complex, bind target DNA, and nick the Cas9 non-target strand. An arrow leads to additional steps not shown in this preview.
Addgene's founders in formalwear, smiling at the camera
Two naked mole-rats posing on a black background

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