Analysis of gene function in cultured embryonic mouse gonads using nucleofection.

Area of Science:

• Developmental Biology
• Genetics
• Molecular Biology

Background:

• Mammalian sex determination relies on precise gene expression for testis or ovary development.
• Existing methods for validating candidate sex-determining genes are limited.
• Gene expression studies have identified potential key genes, but functional validation remains challenging.

Purpose of the Study:

• To introduce a novel nucleofection technique for efficient gene delivery into embryonic gonads.
• To validate the functional roles of sex-determining genes in gonadal differentiation using this new method.
• To establish nucleofection as a screening tool for evaluating potential gonadal development genes.

Main Methods:

• Optimization of nucleofection parameters for E11.5 embryonic gonads.
• Transfection of gonads with expression plasmids, including Sry and Sox9 shRNA (shSox9).
• Culture of transfected gonads and subsequent analysis of gene expression patterns.

Main Results:

• Achieved consistent cell transfection efficiencies of 11% using pMax-GFP.
• Transfection of Sry into female (XX) gonads upregulated Sox9 and downregulated Foxl2.
• Introduction of shSox9 into male (XY) gonads reduced Sox9 and Amh, while upregulating Foxl2.

Conclusions:

• Nucleofection provides an effective method for gene delivery into mammalian gonads.
• This technique successfully recapitulates in vivo gonadal development events.
• Nucleofection serves as a valuable screening tool for assessing the function of sex-determining and gonadal differentiation genes.