Mutation of SOCS2 induces structural and functional changes in mammary development

Area of Science:

• Mammalian lactation biology
• Molecular genetics
• Animal reproductive physiology

Background:

• Lactation is crucial for mammalian reproduction.
• A specific SOCS2 mutation (R96C) in sheep correlates with altered milk yield and mastitis susceptibility.
• Understanding SOCS2's role is key to optimizing lactation and animal health.

Purpose of the Study:

• To investigate the functional impact of the R96C SOCS2 mutation on mammary gland development and lactation.
• To elucidate the cellular and molecular mechanisms underlying SOCS2-mediated effects in the mammary gland.

Main Methods:

• Development of a knock-in mouse model (SOCS2KI/KI) expressing the R96C mutation.
• Comparative analysis of mammary gland morphology and cellular composition between mutant and wild-type mice.
• Assessment of milk composition and gene expression profiles during different physiological states.

Main Results:

• SOCS2KI/KI mice exhibit mammary gland branching defects and reduced epithelial tissue.
• Mammary epithelial cell populations shift, with an increase in basal cells and a decrease in luminal cells.
• Mutant mice show altered milk lipid composition and significant changes in gene expression dynamics.

Conclusions:

• SOCS2 plays a critical role in normal mammary gland development and lactation.
• The R96C mutation affects mammary gland cellularity and milk production characteristics.
• Findings suggest potential strategies for enhancing milk production while maintaining animal welfare.