NKX6-2 is a transcription factor with repressor activity that plays a critical developmental role in oligodendrocyte maturation and myelination 1. As a sequence-specific DNA-binding transcription factor, NKX6-2 regulates genes essential for myelin formation, including MBP and PLP1 23. The protein functions as part of a transcriptional network controlling oligodendrocyte differentiation; ectopic expression of NKX6-2 alongside SOX10 and OLIG2 efficiently converts human fibroblasts and neural progenitors into mature oligodendrocytes in vitro, with conversion efficiency reaching 70% 3. NKX6-2 is involved in regulating axon-glial interactions at myelin paranodes [UniProt]. Mutations in NKX6-2 cause spastic ataxia 8, an autosomal recessive hypomyelinating leukodystrophy with significant clinical heterogeneity 145. Affected individuals present with early-onset progressive spasticity, cerebellar ataxia, and widespread brain hypomyelination, with phenotypic severity ranging from neonatal onset with rapid progression to childhood-onset predominantly motor disease 5. NKX6-2 deficiency impairs oligodendrocyte maturation and causes widespread CNS hypomyelination and poor motor coordination 1. These findings establish NKX6-2 as essential for normal myelin development and support its inclusion in diagnostic panels for hypomyelinating leukodystrophy and spastic ataxia.