ERMN (Ermin) is a cytoskeletal regulatory protein essential for myelinogenesis and myelin maintenance in the central nervous system. During development, ERMN mediates cytoskeletal rearrangements critical for late-stage oligodendrocyte maturation and myelin sheath compaction 1. The gene functions downstream of myelin regulatory transcription factors in differentiating cells 2. Mechanistically, ERMN expression is regulated by folate metabolism and DNA methylation. Disrupted folate availability during anesthesia downregulates ERMN expression, compromising myelinogenesis; this effect is reversible through folic acid supplementation or direct ERMN expression 1. ERMN also participates in morphogenesis of branching structures and filopodium formation through actin filament organization [GO annotations]. Clinically, ERMN dysfunction associates with multiple neurological conditions. Reduced ERMN expression occurs in relapsing-remitting multiple sclerosis patients, potentially contributing to demyelination 3. Genetic variants in ERMN show significant association with autism spectrum disorders, with both deleterious mutations and methylation defects identified 4. ERMN is also implicated in postoperative cognitive dysfunction as a genetic risk marker 5. These findings suggest ERMN represents a convergence point linking developmental myelination, metabolic sensitivity, and neurodevelopmental/neurodegenerative disease pathogenesis.