PMP22 and neuropathy, congenital hypomelinating: Charcot Marie tooth 1A (CMT 1A), Dejerine–Sottas neuropathy (DSN), congenital hypomyelinating neuropathy (CHN), and hereditary neuropathy with liability to pressure palsies (HNPP) are in a family of neuropathies resulting from a mutation of the PMP22 gene, which encodes the myelin protein 22 [128].