Leukodystrophy, Hypomyelinating, 15, also known as hld15, is related to pelizaeus-merzbacher disease and hypomyelinating leukodystrophy. An important gene associated with Leukodystrophy, Hypomyelinating, 15 is EPRS1 (Glutamyl-Prolyl-TRNA Synthetase 1). Affiliated tissues include brain and spinal cord, and related phenotypes are ataxia and developmental regression