title: Relationship of five type 2 diabetes candidate gene polymorphisms to the age at diagnosis of diabetes in the Slovakian population.
abstract: OBJECTIVE
  To examine the relationship between polymorphisms of five candidate genes for type 2 diabetes mellitus (T2DM) and the age at diagnosis of T2DM.
  
  
  METHODS
  538 Slovakian patients with T2DM were included and their age at diagnosis of T2DM retrieved from their medical records. Polymorphisms of genes encoding peroxisome proliferator activated receptor gamma (PPARG), PPARG-coactivator-1 (PGC1), insulin-receptor substrate 1 (IRS1), the subunit Kir 6.2 of the ATP-dependent potassium-channel (KCNJ11) and transcription factor 7-like 2 (TCF7L2) were detected by PCR-RFLP methods.
  
  
  RESULTS
  No significant relationship between the risk alleles of the examined gene polymorphisms to the lower mean age at diagnosis of T2DM was observed. The carriers of the TT-genotype of TCF7L2 rs7903146 polymorphism had significantly increased odds ratio for diagnosis of diabetes before the age of 40 years [OR 3.02 (1.34, 6.81), p = 0.008], in comparison with the CC/CT genotype carriers.
  
  
  CONCLUSIONS
  No significant association of PPARG, PGC1, IRS1, KCNJ11 and TCF7L2 gene polymorphisms and the age at diagnosis of T2DM was observed in the present study. Homozygotes for the risk allele of TCF7L2 had more frequently early onset of T2DM, before age of 40 years (Tab. 4, Ref. 15).
authors.affiliation: 4th Department of Internal Medicine, Faculty of Medicine, PJ Safarik University, Kosice, Slovakia.
authors.forename: M
authors.initials: M
authors.lastname: Kozarova
authors.forename: M
authors.initials: M
authors.lastname: Javorsky
authors.forename: A
authors.initials: A
authors.lastname: Stancakova
authors.forename: M
authors.initials: M
authors.lastname: Dobrikova
authors.forename: V
authors.initials: V
authors.lastname: Habalova
authors.forename: L
authors.initials: L
authors.lastname: Klimcakova
authors.forename: J
authors.initials: J
authors.lastname: Zidzik
authors.forename: J
authors.initials: J
authors.lastname: Haluskova
authors.forename: J
authors.initials: J
authors.lastname: Salagovic
authors.forename: I
authors.initials: I
authors.lastname: Tkac
mesh_terms: D017668:Age of Onset; D003924:Diabetes Mellitus, Type 2 / Q000175:diagnosis / Q000235:genetics*; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D018154:Slovakia