Monarch Disease Ontology entry MONDO_0012125 (hypomyelinating leukodystrophy 2) can be described as follows. Any leukodystrophy in which the cause of the disease is a mutation in the GJC2 gene. Also known as: GJC2 leukodystrophy, HLD2, PMLD1, Pelizaeus-Merzbacher-like disease 1, Pelizaeus-Merzbacher-like disease due to GJC2 mutation, hypomyelinating leukodystrophy type 2, leukodystrophy caused by mutation in GJC2, leukodystrophy, hypomyelinating, type 2.