Sex differences in gene regulatory networks during mid-gestational brain development

Area of Science:

• Neuroscience
• Genetics
• Bioinformatics

Background:

• Neurodevelopmental disorders exhibit sex-based variations, with fetal brain development being a critical risk period.
• While sex chromosome gene expression differences are known, autosomal gene expression variations in the fetal brain remain underexplored.

Purpose of the Study:

• To investigate biological pathways underlying sex differences in the developing fetal brain.
• To identify sex-biased gene expression patterns and their relevance to neurodevelopmental disorders.

Main Methods:

• Applied network medicine principles using integrative bioinformatics tools (CEMiTool, netZoo).
• Analyzed fetal brain transcriptomic data to construct co-expression and regulatory networks.
• Utilized Methylation Sensitive Enrichment (MSET) analysis to assess the relevance of identified pathways.

Main Results:

• Network analysis revealed significant regulatory differences in gene expression between male and female fetal brains.
• Identified sex-biased biological processes including cell cycle, cell differentiation, energy metabolism, and extracellular matrix organization.
• MSET analysis confirmed the relevance of these sex-biased pathways to neurodevelopmental disorders, notably autism.

Conclusions:

• Fetal brain development displays consistent sex-biased gene expression in key biological pathways.
• These sex differences are implicated in the etiology of neurodevelopmental disorders, offering potential targets for sex-specific interventions.
• Integrative network analysis provides a powerful approach to uncover complex biological mechanisms underlying sex differences in the brain.