Sex differences in hepatic one-carbon metabolism

Area of Science:

• Biochemistry
• Systems Biology
• Metabolomics

Background:

• Significant sex-based differences exist in the expression of key enzymes involved in one-carbon metabolism, primarily attributed to sex hormones.
• These metabolic disparities are amplified during pregnancy, highlighting their clinical relevance.
• Understanding these sex differences is crucial for advancing precision medicine approaches.

Purpose of the Study:

• To develop a mathematical model of hepatic one-carbon metabolism.
• To investigate the physiological consequences of sex-based gene expression differences.
• To elucidate the mechanistic basis for observed metabolite concentration variations between sexes.

Main Methods:

• Construction of a mathematical model of hepatic one-carbon metabolism, integrating physiological and biochemical data.
• Utilizing the model to simulate and analyze the impact of sex differences in gene expression.
• Investigating the effects of factors like vitamin deficiencies, gene polymorphisms, and nutrient intake.

Main Results:

• The model provides a mechanistic explanation for observed differences in one-carbon metabolism, such as lower S-adenosylmethionine and homocysteine, and higher choline and betaine levels in women.
• A novel explanation is proposed for how folate supplementation reduces homocysteine levels.
• The model successfully demonstrates how gene expression variations lead to distinct metabolic profiles between males and females.

Conclusions:

• The developed mathematical model serves as a valuable platform for exploring the mechanistic underpinnings of metabolite associations.
• The study elucidates the direct link between gene expression differences and metabolic variations between sexes.
• This work contributes to a deeper understanding of sex-specific metabolic regulation and its implications for health and disease.