PMID- 9361298 OWN - NLM STAT- MEDLINE DCOM- 19971210 LR - 20231213 IS - 0969-9961 (Print) IS - 0969-9961 (Linking) VI - 4 IP - 3-4 DP - 1997 TI - Connexin32 and X-linked Charcot-Marie-Tooth disease. PG - 221-30 AB - Mutations in the gap junction gene connexin32 (Cx32) cause the X-linked form of Charcot-Marie-Tooth disease, an inherited demyelinating neuropathy. More than 130 different mutations have been described, affecting all portions of the Cx32 protein. In transfected cells, the mutant Cx32 proteins encoded by some Cx32 mutations fall to reach the cell surface; other mutant proteins reach the cell surface, but only one of these forms functional gap junctions. In peripheral nerve, Cx32 is localized to incisures and paranodes, regions of noncompact myelin within the myelin sheath. This localization suggests that Cx32 forms "reflexive" gap junctions that allow ions and small molecules to diffuse directly across the myelin sheath, which is a thousandfold shorter distance than the circumferential pathway through the Schwann cell cytoplasm. Cx32 mutations may interrupt this shorter pathway or have other toxic effects, thereby injuring myelinating Schwann cells and their axons. FAU - Bone, L J AU - Bone LJ AD - Department of Neurology, University of Pennsylvania School of Medicine, Philadelphia 19104, USA. FAU - Deschenes, S M AU - Deschenes SM FAU - Balice-Gordon, R J AU - Balice-Gordon RJ FAU - Fischbeck, K H AU - Fischbeck KH FAU - Scherer, S S AU - Scherer SS LA - eng GR - NS08075/NS/NINDS NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PT - Review PL - United States TA - Neurobiol Dis JT - Neurobiology of disease JID - 9500169 RN - 0 (Connexins) SB - IM MH - Animals MH - Charcot-Marie-Tooth Disease/*genetics MH - Connexins/*genetics MH - Genetic Linkage/*genetics MH - Humans MH - X Chromosome/*genetics MH - Gap Junction beta-1 Protein RF - 82 EDAT- 1997/01/01 00:00 MHDA- 1997/11/15 00:01 CRDT- 1997/01/01 00:00 PHST- 1997/01/01 00:00 [pubmed] PHST- 1997/11/15 00:01 [medline] PHST- 1997/01/01 00:00 [entrez] AID - S0969-9961(97)90152-2 [pii] AID - 10.1006/nbdi.1997.0152 [doi] PST - ppublish SO - Neurobiol Dis. 1997;4(3-4):221-30. doi: 10.1006/nbdi.1997.0152.