SLC9A9 Co-expression modules in autism-associated brain regions

Area of Science:

• Neuroscience
• Genetics
• Developmental Biology

Background:

• SLC9A9, a sodium-hydrogen exchanger, is highly expressed in the brain and linked to neuropsychiatric disorders like autism spectrum disorders (ASDs).
• Limited research exists on SLC9A9's gene expression patterns and biological pathways, particularly in relation to ASDs.

Purpose of the Study:

• To investigate the potential biological roles of SLC9A9 in ASD-associated brain regions during development.
• To analyze gene expression networks and identify pathways associated with SLC9A9 in the context of ASDs.

Main Methods:

• Weighted gene co-expression network analysis (WGCNA) on Brainspan RNA-seq data.
• Comparison of prenatal and postnatal gene expression networks in three ASD-associated brain regions.
• ASD-associated single nucleotide polymorphism (SNP) enrichment analysis and cell signature enrichment analysis.

Main Results:

• Gene expression modules showed dynamic changes in membership, size, and connectivity over time.
• SLC9A9 was significantly associated with immune functions, metabolism, apoptosis, endocytosis, and signaling cascades.
• A high autism risk signal was detected in the prenatal hippocampal module, enriched with astrocyte and oligodendrocyte markers.

Conclusions:

• SLC9A9 may be involved in the pathophysiology of ASDs.
• Confirmed roles in endocytosis and immune regulation, with novel potential roles in mTOR signaling and cell survival.
• Provides a molecular map to guide future research on SLC9A9 in ASDs.