The HCF-1:OGT axis regulates neuronal proliferation and differentiation

Area of Science:

• Neuroscience
• Developmental Biology
• Genetics

Background:

• Neuronal differentiation requires complex coordination of cell processes.
• Host Cell Factor-1 (HCF-1), an X-linked transcriptional co-regulator, is vital for development but its role in neurogenesis is unclear.
• HCF-1 is linked to human intellectual disability.

Purpose of the Study:

• To investigate the function of the HCF-1-OGT axis in neuronal differentiation and forebrain development.
• To define the lineage-specific roles of HCF-1 in mammalian neurogenesis.

Main Methods:

• Conditional deletion of HCF-1 in specific neuronal lineages (Nkx2.1-derived).
• Transcriptomic profiling to analyze gene expression changes.
• In vitro studies on neuronal proliferation, differentiation, and neurite outgrowth.
• Glycoproteomic analysis to study OGT-dependent protein networks.

Main Results:

• Loss of HCF-1 in neuronal lineages caused cortical disorganization, reduced GABAergic interneuron survival, and forebrain commissure defects.
• HCF-1 depletion dysregulated gene networks involved in neuronal differentiation, chromatin regulation, and axon guidance.
• In vitro, HCF-1 or OGT inhibition impaired neuronal proliferation, differentiation, and neurite outgrowth.

Conclusions:

• HCF-1 is a key regulator of neuronal differentiation and forebrain organization.
• Disruption of the HCF-1-OGT axis contributes to neurodevelopmental disorders.
• Findings provide mechanistic insights into HCF-1's role in neurodevelopment.