GNB4 and bile duct papillary neoplasm: From new genes that were just added, mutations were found in a significant proportions of them, pathogenic mutations were found in genes ATP7A, COX6A1 and DYNC1H1. Possibly pathogenic variants were found in four other genes: BICD2, GNB4, ITPR3 and PDK3. These results show that mutations in genes only recently described in IPN, may be responsible for more than 10 % of causes of inherited neuropathies which were etiologically clarified in this study.