Rapid Diagnosis of CMT1A Duplications and HNPP Deletions by Multiplex Microsatellite PCR

  • Choi, Byung-Ok (Department of Neurology and Ewha Medical Research Center, Ewha Womans University College of Medicine) ;
  • Kim, Joonki (Department of Biological Science, Kongju National University) ;
  • Lee, Kyung Lyong (Department of Biological Science, Kongju National University) ;
  • Yu, Jin Seok (Department of Biological Science, Kongju National University) ;
  • Hwang, Jung Hee (Department of Biological Science, Kongju National University) ;
  • Chung, Ki Wha (Department of Biological Science, Kongju National University)
  • Received : 2006.10.02
  • Accepted : 2006.12.06
  • Published : 2007.02.28

Abstract

Charcot-Marie-Tooth (CMT) disease and hereditary neuropathy with liability to pressure palsies (HNPP) are frequent forms of genetically heterogeneous peripheral neuropathies. Reciprocal unequal crossover between flanking CMT1A-REPs on chromosome 17p11.2-p12 is a major cause of CMT type 1A (CMT1A) and HNPP. The importance of a sensitive and rapid method for identifying the CMT1A duplication and HNPP deletion is being emphasized. In the present study, we established a molecular diagnostic method for the CMT1A duplication and HNPP deletion based on hexaplex PCR of 6 microsatellite markers (D17S921, D17S9B, D17S9A, D17S918, D17S4A and D17S2230). The method is highly time-, cost- and sample-saving because the six markers are amplified by a single PCR reaction and resolved with a single capillary in 3 h. Several statistical and forensic estimates indicated that most of these markers are likely to be useful for diagnosing the peripheral neuropathies. Reproducibility, as determined by concordance between independent tests, was estimated to be 100%. The likelihood that genotypes of all six markers are homozygous in randomly selected individuals was calculated to be $1.6{\times}10^{-4}$, which indicates that the statistical error rate for this diagnosis of HNPP deletion is only 0.016%.

Keywords

Charcot-Marie-Tooth Disease (CMT);CMT1A;Hereditary Neuropathy with Liability to Pressure Palsied (HNPP);Hexaplex PCR;Microsatellite;PMP22

Acknowledgement

Supported by : Korea Research Foundation, Ministry of Health and Welfare in Korea

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