title: The influence of promoter -202 A/C polymorphism (rs2854744) of the IGFBP-3 gene on erectile dysfunction risk and serum levels of IGF-I and IGFBP-3.
abstract: We studied whether the IGFBP-3 gene polymorphism rs2854744 is associated with erectile dysfunction.
  
  
  
  We investigated the association of this polymorphism with erectile dysfunction in 176 cases and 352 controls. We genotyped rs2854744 using polymerase chain reaction-restriction fragment length polymorphism. Circulating concentrations of IGF-I and IGFBP-3 were also measured.
  
  
  
  Allelic frequencies were 0.474 (A allele) and 0.526 (C allele) in men with erectile dysfunction, and 0.457 (A allele) and 0.543 (C allele) in normal controls (adjusted OR 1.74, 95% CI 0.82-2.43, p = 0.08). The frequency of the IGFBP-3 A-202C polymorphism genotype was 0.273 (CC), 0.506 (AC) and 0.221 (AA) in the case group, and 0.296 (CC), 0.494 (AC) and 0.210 (AA) in the control group (chi-square test p = 0.08). Neither the IGFBP-3 A-202C polymorphism nor serum IGF-I and IGFBP-3 levels were significantly associated with the risk of erectile dysfunction. Carriers of the AA genotype had the highest age adjusted serum IGFBP-3. This demonstrated a stepwise decrease in the presence of 1 or 2 copies of the C allele (mean ± SD 4,541 ± 796.2, 3,552 ± 642.4 and 3,314 ± 669.3 ng/ml, respectively). There was a positive correlation between serum IGFBP-3 and serum IGF-I concentrations (Spearman correlation coefficient r = 0.34, p for trend = 0.001).
  
  
  
  The IGFBP-3 gene A-202C polymorphism does not modulate the risk of erectile dysfunction.
authors.affiliation: Clinical Center for Urological Disease Diagnosis and Private Clinic Specialized in Urological and Andrological Genetics, Tehran, Iran. mersa_mum@hotmail.com
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Safarinejad
authors.forename: Nayyer
authors.initials: N
authors.lastname: Shafiei
authors.forename: Shiva
authors.initials: S
authors.lastname: Safarinejad
mesh_terms: D000328:Adult; D007172:Erectile Dysfunction / Q000235:genetics*; D006801:Humans; D018972:Insulin-Like Growth Factor Binding Protein 3 / Q000097:blood* / Q000235:genetics*; D007334:Insulin-Like Growth Factor I / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic / Q000235:genetics*
chemical_list: D018972:Insulin-Like Growth Factor Binding Protein 3; D007334:Insulin-Like Growth Factor I