Animal models for inherited peripheral neuropathies

Journal of Anatomy
Rudolf Martini

Abstract

Recent progress in human genetics and neurobiology has led to the identification of various mutations in particular myelin genes as the cause for many of the known inherited demyelinating peripheral neuropathies. Mutations in 3 distinct myelin genes, PMP22, P0, and connexin 32 cause the 3 major demyelinating subtypes of Charcot-Marie-Tooth (CMT) disease, CMT1A, CMT1B and CMTX, respectively. In addition, a reduction in the gene dosage of PMP22 causes hereditary neuropathy with liability to pressure palsies (HNPP), while particular point mutations in PMP22 and P0 cause the severe Dejerine-Sottas (DS) neuropathy. A series of spontaneous and genetically engineered rodent mutants for genes for the above-mentioned myelin constituents are now available and their suitability to serve as models for these still untreatable diseases is an issue of particular interest. The spontaneous mutants Trembler-J and Trembler, with point mutations in PMP22, reflect some of the pathological alterations seen in CMT1A and DS patients, respectively. Furthermore, engineered mutants that either over or underexpress particular myelin genes are suitable models for patients who are similarly compromised in the gene dosage of the corresponding genes. In addit...Continue Reading

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