Analysis of the modifying effects of TAP 1/2 genes on cystic fibrosis phenotype

Turk J Pediatr. Apr-Jun 2002;44(2):91-7.

Abstract

Phenotypic variability has been reported in cystic fibrosis (CF) patients. TAP1 and TAP2 genes are encoding "the transporter associated with antigen processing" proteins. The aim of the present study was to analyze the frequency of TAP 1/2 variants in the Turkish population and to investigate a possible modifying role of these variants in CF phenotype. Sixty-three CF patients of known genotypes and 100 healthy control subjects were analyzed. There was a significant difference in the frequencies at positions 333 and 637 of TAP 1 gene and at position 665 of TAP 2 gene between patients and controls. Comparison of TAP gene polymorphisms in 36 CF patients homozygous for AF508 mutation with control subjects revealed a significant difference at position 665 of TAP 2 gene. These findings may be useful to assess the predisposition and to predict severity of the disease. We demonstrated that TAP genes might have modifying effects on the CF phenotype.

MeSH terms

  • ATP Binding Cassette Transporter, Subfamily B, Member 2
  • ATP Binding Cassette Transporter, Subfamily B, Member 3
  • ATP-Binding Cassette Transporters / genetics*
  • Adolescent
  • Child
  • Child, Preschool
  • Cystic Fibrosis / epidemiology
  • Cystic Fibrosis / genetics*
  • Female
  • Gene Frequency
  • Genotype
  • Humans
  • Male
  • Phenotype
  • Polymerase Chain Reaction / methods
  • Polymorphism, Genetic
  • Turkey / epidemiology

Substances

  • ATP Binding Cassette Transporter, Subfamily B, Member 2
  • ATP Binding Cassette Transporter, Subfamily B, Member 3
  • ATP-Binding Cassette Transporters
  • TAP1 protein, human
  • TAP2 protein, human