title: [Detection of the PMP22 gene duplication in peripheral neuropathy patients: a study in Mexican population].
abstract: BACKGROUND
  Charcot-Marie-Tooth disease (CMT) is a neuropathy that affects sensory and motor nerves. The most common CMT subtype is CMT1A due to a PMP22 duplication of a 1.5 Mb fragment on the 17p11.2-p12. The development of a specific molecular technique that detects the PMP22 duplication is necessary for the diagnosis of CMT1A.
  
  
  OBJECTIVE
  To establish a routinary test for detection of the PMP22 gene duplication in Mexican population and to estimate the CMT1A frequency in patients clinically diagnosed as CMT.
  
  
  METHODS
  A cohort of 157 individuals clinically diagnosed as CMT were analyzed. The detection of the PMP22 gene duplication was performed using the comparative 2-ΔΔCT qPCR method.
  
  
  RESULTS
  The comparative 2-ΔΔCT method was sensitive and reliable for the detection of the PMP22 duplication. In order to validate the testing, data was compared with FISH results. Duplication of PMP22 was detected in 79 patients (50.3%). Although CMT1A frequency is different among populations, in Mexican patients it was similar with other populations such as United States, Australia, Finland, Sweden and Spain.
  
  
  CONCLUSIONS
  The qPCR technique is an accurate and inexpensive method for the diagnosis of CMT1A. This method can be routinely used in Mexico where CMT1A represents ≍ 50% of CMT cases. Molecular diagnosis of CMT1A is essential for the genetic counseling and treatment of patients.
authors.forename: Hernán
authors.initials: H
authors.lastname: Cortés
authors.forename: Óscar
authors.initials: Ó
authors.lastname: Hernández-Hernández
authors.forename: Teresa
authors.initials: T
authors.lastname: Bautista-Tirado
authors.forename: Rosa Elena
authors.initials: RE
authors.lastname: Escobar-Cedillo
authors.affiliation: Instituto Nacional de Rehabilitacion, SSA, Mexico DF, Mexico.
authors.forename: Jonathan J
authors.initials: JJ
authors.lastname: Magaña
authors.forename: Norberto
authors.initials: N
authors.lastname: Leyva-García
mesh_terms: D002607:Charcot-Marie-Tooth Disease / Q000208:ethnology / Q000235:genetics*; D002886:Chromosomes, Human, Pair 17 / Q000235:genetics; D005260:Female; D020440:Gene Duplication; D005787:Gene Frequency; D006801:Humans; D008297:Male; D008800:Mexico / Q000453:epidemiology; D025202:Molecular Diagnostic Techniques / Q000191:economics; D009185:Myelin Proteins / Q000235:genetics*; D016133:Polymerase Chain Reaction / Q000191:economics / Q000379:methods
chemical_list: D009185:Myelin Proteins; C073687:PMP22 protein, human