Contemporary zebrafish transgenesis with Tol2 and application for Cre/lox recombination experiments

Area of Science:

• Genetics
• Developmental Biology
• Molecular Biology

Background:

• Cre/lox recombination is a powerful tool for genetic manipulation in multicellular organisms.
• Zebrafish are a key model organism for genetic studies due to their rapid development and amenability to transgenesis.
• Tamoxifen-inducible CreERT2 systems offer temporal control over recombination events.

Purpose of the Study:

• To provide a comprehensive guide to Cre/lox methodology in zebrafish.
• To detail practical transgenesis techniques for Cre/lox applications.
• To outline protocols for spatiotemporal transgene regulation using CreERT2.

Main Methods:

• Cre/lox recombination basics and CreERT2 tamoxifen induction.
• Tol2-mediated transgenesis for stable transgene integration.
• Advanced techniques like phiC31 and CRISPR-Cas9 for knock-ins.
• Protocols for 4-hydroxytamoxifen-mediated CreERT2 induction.

Main Results:

• Efficient transgenesis protocols for creating single-insertion transgenes.
• Demonstration of spatiotemporal control of lox transgenes in zebrafish embryos.
• Establishment of Cre/lox systems for diverse genetic applications.

Conclusions:

• Cre/lox technology, enhanced by modern transgenesis, is highly effective for spatiotemporal transgene regulation in zebrafish.
• This approach facilitates advanced reverse genetics, including misexpression and lineage tracing.
• The described methods enable sophisticated experimental designs beyond traditional lineage tracing.