Anolis Lizards as a Model System for Studies of Gene Function in Reptile Development and Evolution

Area of Science:

• Herpetology
• Molecular Biology
• Genetics

Background:

• Anolis lizards are a diverse group with over 400 species, studied for speciation, evolution, and adaptation.
• CRISPR-based gene editing offers potential for Anolis research, but reproductive biology poses significant challenges.
• Previous gene editing methods in vertebrates often require early-stage embryo manipulation, which is difficult in anoles.

Purpose of the Study:

• To overcome reproductive barriers in Anolis lizards for gene editing applications.
• To introduce a novel surgical procedure for delivering CRISPR-Cas into lizard oocytes.
• To enable the production of gene-edited anoles and facilitate studies on gene function.

Main Methods:

• A surgical procedure was established to inject CRISPR-Cas into developing oocytes of female lizards.
• This method bypasses the need for manipulating early-stage embryos.
• The technique was successfully adapted for use in other reptile species.

Main Results:

• The oocyte injection method allows for the production of gene-edited anoles.
• This approach circumvents challenges associated with early-stage embryo manipulation in anoles.
• The method's adaptability to other reptiles broadens its applicability.

Conclusions:

• A novel surgical technique enables CRISPR-Cas delivery into lizard oocytes, facilitating gene editing in Anolis.
• This method overcomes significant reproductive barriers in anoles and is adaptable to other reptiles.
• The procedure will broadly enable functional genomics studies in reptiles.