PMP22 and Charcot-Marie-Tooth disease type 1A: Duplication and deletion of a 1.4 Mbp-length 17p12 region including peripheral myelin protein 22 (PMP22; MIM 601097) cause CMT type 1A (CMT1A; MIM 118220) and hereditary neuropathy with liability to pressure palsies (HNPP; MIM 162500), respectively [3,4].