CRISPR-Cas9-mediated Precise Knock-in Edits in Zebrafish Hearts.

Area of Science:

• Genetics and Genomics
• Cardiovascular Research
• Zebrafish Models

Background:

• CRISPR technology allows precise genetic manipulation in animal models for physiological studies.
• Zebrafish are a valuable genetic model for studying heritable diseases, development, and toxicology.
• Existing CRISPR methods face challenges in generating and detecting precise knock-in edits.

Purpose of the Study:

• To develop and validate a CRISPR-Cas9 based knock-in approach in zebrafish.
• To enable simple detection of precise genetic edits.
• To facilitate the study of genes related to cardiac repolarization and Long QT Syndrome (LQTS).

Main Methods:

• Utilized a two-single-guide RNA (sgRNA) CRISPR-Cas9 strategy.
• Designed the system to excise and replace target sequences with a reporter gene.
• Employed non-invasive phenotypic measurements of cardiac electrical function in zebrafish larvae.

Main Results:

• Successfully demonstrated a CRISPR-Cas9 knock-in approach with simple edit detection in zebrafish.
• Validated the method by targeting a gene associated with Long QT Syndrome.
• Showcased the ability to perform non-invasive cardiac function analysis in edited zebrafish.

Conclusions:

• This approach enhances the efficiency of generating and detecting precise knock-in edits in zebrafish.
• It enables the efficient study of disease-associated variants in a whole-organism model.
• The strategy supports the insertion of various exogenous sequences, expanding research possibilities.