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Charcot–Marie–Tooth syndrome

Author: NCBI, Posted on Monday, July 25 @ 17:35:51 IST by RxPG  

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Neurology

Charcot–Marie–Tooth disease (CMT) is named after its three discoverers, who first noted the disease around the turn of the century. It is the most common inherited peripheral neuropathy in the world, characterized by a slowly progressive degeneration of the muscles in the foot, lower leg, hand, and forearm and a mild loss of sensation in the limbs, fingers, and toes. Full expression of CMT's clinical symptoms generally occurs by age 30. CMT is not a fatal disease, however, and the disorder does not affect normal life expectancy.

CMT is a genetically heterogeneous disorder in which mutations in different genes can produce the same clinical symptoms. In CMT there are not only different genes but different patterns of inheritance. One of the most common forms of CMT is Type 1A. The gene for Type 1A CMT maps to chromosome 17 and is thought to code for a protein (PMP22) involved in coating peripheral nerves with myelin, a fatty sheath that is important for their conductance. Other types of CMT include Type 1B, autosomal-recessive, and X-linked.

The same proteins involved in the Type 1A and Type 1B CMT are also involved in a disease called Dejerine–Sottas Syndrome (DSS), in which similar clinical symptoms are presented, but they are more severe. Research into understanding the pathogenesis of CMT, through the use of animal models for the disease, should also give insight into DSS and may lead to therapies for both diseases

Reference: Genes and Disease, NCBI



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