Genetics

This blog post examines the genetic and biological mechanisms underlying multiple sclerosis (MS) and neuromyelitis optica spectrum disorder (NMOSD), two major inflammatory demyelinating diseases of the central nervous system. Drawing on the review by Ortiz and colleagues, it explores how HLA variants, immune-regulatory genes, genome-wide association findings, epigenetic mechanisms, and gene–environment interactions contribute to disease susceptibility. Particular attention is given to the distinct genetic profiles of MS and NMOSD, the role of variants affecting immune signaling and aquaporin-4-associated pathways, and the importance of ancestry and environmental exposure. Together, these findings illustrate how modern neurogenetics is improving understanding of disease mechanisms and supporting the development of more precise diagnostic and personalized therapeutic approaches.