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Clinical Chemistry 41: 1105-1108, 1995;
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Clinical Chemistry, Vol 41, 1105-1108, Copyright © 1995 by American Association for Clinical Chemistry

Detection of Charcot-Marie-Tooth type 1A duplication by the polymerase chain reaction

IP Blair, ML Kennerson and GA Nicholson
Molecular Medicine Laboratory, University of Sydney, NSW, Australia.

Charcot-Marie-Tooth disease type 1A (CMT1A) is a hereditary peripheral neuropathy with a genetic locus on chromosome 17p11.2. The majority of patients carry a duplicated DNA segment that encompasses the gene PMP22, which encodes a peripheral myelin protein. PMP22 is the crucial gene involved in the pathogenesis of CMT1A. Molecular diagnosis of CMT1A requires detection of this duplicated segment. Existing methods for detection of the duplication are laborious and time consuming. We have developed a set of polymorphic (AC)n repeat markers (contained within the duplication) for use in the polymerase chain reaction, which give a high probability of detecting three unique alleles in affected individuals. This test detected 85% of a panel of 52 CMT1A patients in which the duplication had previously been demonstrated.


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