PMP22 and hereditary neuropathy with liability to pressure palsies: In addition, a variety of point mutations in the PMP22 gene has been identified in patients with a broad continuum of inherited neuropathies ranging from HNPP, CMT1E, infantile-onset severe dysmyelinating neuropathies similar to Dejerine-Sottas syndrome, to congenital hypomyelinating neuropathy6–10.