Spectrum of GJB2 Mutations in Turkey Comprises Both Caucasian and Oriental Variants: Roles of Parental Consanguinity and Assortative Mating

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Tekin M., Duman T., Bogoclu G., Incesulu A., Comak E., Ilhan I., ...Daha Fazla

HUMAN MUTATION, cilt.21, sa.5, 2003 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 21 Sayı: 5
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1002/humu.9137
  • Dergi Adı: HUMAN MUTATION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: assortative mating, connexin 26, consanguinity, deafness, GJB2, GJB6, mutation screening, CONNEXIN 26 GENE, SENSORINEURAL HEARING-LOSS, 35DELG MUTATION, CHILDHOOD DEAFNESS, FREQUENCY, POPULATION
  • Akdeniz Üniversitesi Adresli: Evet

Özet

Considerable differences exist for the spectrum of GJB2 mutations in different populations. Screening for the c.35delG mutation in 256 independent probands, 154 multiplex (familial) and 102 simplex (sporadic), coming from different regions of Turkey revealed 37 (14.5%) homozygotes. The allele frequency of c.35delG ranged from 5% to 53% in different cities. Parental consanguinity was noted in 34% of c.35delG homozygotes, yet it was 55% in c.35delG negatives (p= 0.034). Further screening for GJB2 mutations in multiplex families demonstrated the presence of c.167delT and L90P mutations as well as a novel complex mutation, c.236_ 239delTGCAinsAGATCCG, in single alleles, leading to compound heterozygosity with c.35delG. The homozygous E120del mutation was found in another case. The V27I polymorphism was detected in five alleles, one of which was associated with the E114G change. Assortative mating was a significant factor predicting to detect biallelic mutations in the GJB2 gene. These results confirm the overwhelming majority of c.35delG in the Turkish deaf individuals as well as the presence of other changes detected in Caucasian and Asian populations. c 2003 Wiley-Liss, Inc.