Frequently asked questions
Our Scientific Applications Support team has assembled a list of frequently asked questions to help you find answers quickly. Filter using one or more categories to focus on specific topics, or use the search bar to perform a text search.
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How do I choose which two guide RNAs to multiplex, when using the Alt-R™ nickases?
There are multiple factors to consider when selecting the guide RNAs to multiplex with Cas9 nickase:
- Each crRNA should function efficiently in individual genome editing experiments.
- The two guide RNAs must target opposite strands to ensure a double-strand break is created.
- Distance between cleavage sites is important for optimal performance.
- Alt-R Cas9 D10A Nickase 3NLS: 40–70 bp
- Alt-R Cas9 H840A Nickase 3NLS: 50–70 bp
- Outward PAM site orientation (right side)
For more information about the design and use of Cas9 nickases, refer to the application note at www.idtdna.com/CRISPR-Cas9 (Support section).