title: Cystic fibrosis patients from the Black Sea region: the 1677delTA mutation.
abstract: A 2 bp deletion in exon 10 of the CFTR gene, 1677delTA, which is very rare among CF chromosomes worldwide, was found to be a relatively common cause of cystic fibrosis in countries located in the region of the Black Sea. The frequency of the mutation was compared among cystic fibrosis patients from several populations, namely Bulgarians, Turks, Greek-Cypriots, Georgians, and Russians. The deletion is most common among Georgian CF patients and gradually declines in frequency in neighbouring populations. It is invariably related to a common polymorphic haplotype which is rare among normal chromosomes in Bulgaria but was found to be common in Turkey. The geographic gradient in the frequency of the mutation, along with findings on polymorphic haplotype distribution, suggest that the mutation is relatively young in evolutionary terms and spread as the result of west and south-bound migrations originating from Georgia. The 1677delTA mutation is related to a severe clinical phenotype with a high early mortality rate among homozygotes and possibly to an increased risk of meconium ileus.
authors.affiliation: Laboratory of Molecular Pathology, University Obstetrics and Gynaecology Hospital, Sofia, Bulgaria.
authors.forename: D
authors.initials: D
authors.lastname: Angelicheva
authors.forename: K
authors.initials: K
authors.lastname: Boteva
authors.forename: A
authors.initials: A
authors.lastname: Jordanova
authors.forename: A
authors.initials: A
authors.lastname: Savov
authors.forename: A
authors.initials: A
authors.lastname: Kufardjieva
authors.forename: A
authors.initials: A
authors.lastname: Tolun
authors.forename: M
authors.initials: M
authors.lastname: Telatar
authors.forename: A
authors.initials: A
authors.lastname: Akarsubaşi
authors.forename: F
authors.initials: F
authors.lastname: Köprübaşi
authors.forename: S
authors.initials: S
authors.lastname: Aydoğdu
mesh_terms: D002031:Bulgaria / Q000453:epidemiology; D003535:Cyprus / Q000453:epidemiology; D003550:Cystic Fibrosis / Q000208:ethnology* / Q000235:genetics / Q000473:pathology; D004252:DNA Mutational Analysis / Q000379:methods; D005260:Female; D016368:Frameshift Mutation; D005787:Gene Frequency; D005838:Genotype; D005846:Georgia (Republic) / Q000453:epidemiology; D006239:Haplotypes; D006801:Humans; D007223:Infant; D008297:Male; D017720:Molecular Epidemiology; D010641:Phenotype; D006178:Romani People / Q000235:genetics; D012426:Russia / Q000453:epidemiology; D017384:Sequence Deletion; D014421:Turkey / Q000453:epidemiology