GDAP1 and Charcot-Marie-Tooth disease: Mutations in the gene GDAP1 (ganglioside-induced differentiation-associated protein 1) cause various forms of CMT: the most frequent recessively inherited demyelinating subtype CMT4A1, the axonal-recessive (AR)-CMT22, the intermediate-recessive subtype CMTRIA3, and the dominant subtype CMT2K4.