Mutational analysis and genotype/phenotype correlation in Turkish Charcot-Marie-Tooth Type I and HNPP patients

Bissar-Tadmouri N., Parman Y., Boutrand L., Deymeer F., Serdaroglu P., Vandenberghe A., ...Daha Fazla

CLINICAL GENETICS, cilt.58, sa.5, ss.396-402, 2000 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 58 Sayı: 5
  • Basım Tarihi: 2000
  • Doi Numarası: 10.1034/j.1399-0004.2000.580511.x
  • Dergi Adı: CLINICAL GENETICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.396-402
  • Anahtar Kelimeler: CMT1, Cx32, frameshift mutation, HNPP, PMP22, point mutation, polymorphism, Turkey, PERIPHERAL MYELIN PROTEIN-22, DEJERINE-SOTTAS-DISEASE, HEREDITARY NEUROPATHY, PRESSURE PALSIES, PMP22 GENE, POINT MUTATION, CHROMOSOME 17P11.2, CONNEXIN-32 GENE, DUPLICATION, LIABILITY
  • İstanbul Üniversitesi Adresli: Evet

Özet

The major Charcot-Marie-Tooth Type 1 (CMT1) locus, CMT1A, and Hereditary neuropathy with liability to pressure palsies (HNPP) cosegregate with a 1.5-Mb duplication and a 1.5-Mb deletion, respectively, in band 17p11.2. Point mutations in peripheral myelin gene 22 (PMP22), myelin protein zero (MPZ), and connexin 32 (Cx32) have been reported in CMT1, and in PMP22 in HNPP patients without deletion. We have screened 54 CMT1 patients, of variable clinical severity, and 25 HNPP patients from Turkey, with no duplication or deletion, for mutations in the PMP22 and Cx32 genes. A novel frameshift mutation affecting the second extracellular domain of PMP22 was found in an HNPP patient, while a point mutation in the second transmembrane domain of the protein was detected in a CMT1 patient. Two point mutations affecting different domains of Cx32 were identified in two CMTX patients. Another patient was found to carry a polymorphism in a non-conserved codon of the Cx32 gene. The clinical phenotypes of the patients correlate well with the effect of the mutation on the protein.