- Gene for hereditary neuropathy with liability to pressure palsies (HNPP) maps to chromosome 17 at or close to the locus for HMSN type 1. Mariman, E.C., Gabreëls-Festen, A.A., van Beersum, S.E., Jongen, P.J., Ropers, H.H., Gabreëls, F.J. Hum. Genet. (1993)