Goat SRY induces testis development in XX transgenic mice

Area of Science:

• Genetics
• Developmental Biology
• Mammalian Evolution

Background:

• The SRY gene is the primary determinant of male sex in mammals.
• SRY exhibits significant divergence in protein structure and expression regulation across mammalian species, particularly between rodents and other mammals.

Purpose of the Study:

• To investigate the functional conservation of the testis-determining gene SRY across mammalian species.
• To determine if a non-mouse SRY gene can induce testis formation in a mammalian model.

Main Methods:

• Expression of the goat SRY (gSRY) gene in XX transgenic mouse gonads.
• Analysis of testis formation in the genetically female (XX) mice carrying the gSRY transgene.

Main Results:

• The introduced goat SRY gene successfully induced testis formation in XX mouse gonads.
• Testis development occurred despite differences in the expression profile between goat and mouse SRY.

Conclusions:

• The SRY gene's function in initiating testis development is conserved across mammalian species.
• A non-mouse SRY gene can override genetic sex determination, indicating a conserved molecular mechanism of action.