title: Association analysis of type 2 diabetes Loci in type 1 diabetes.
abstract: OBJECTIVE
  To search for a possible association of type 1 diabetes with 10 validated type 2 diabetes loci, i.e., PPARG, KCNJ11, WFS1, HNF1B, IDE/HHEX, SLC30A8, CDKAL1, CDKN2A/B, IGF2BP2, and FTO/RPGRIP1L.
  
  
  METHODS
  Two European population samples were studied: 1) one case-control cohort of 514 type 1 diabetic subjects and 2,027 control subjects and 2) one family cohort of 483 complete type 1 diabetic case-parent trios (total 997 affected). A total of 13 tag single nucleotide polymorphisms (SNPs) from the 10 type 2 diabetes loci were analyzed for type 1 diabetes association.
  
  
  RESULTS
  No association of type 1 diabetes was found with any of the 10 type 2 diabetes loci, and no age-at-onset effect was detected. By combined analysis using the Wellcome Trust Case-Control Consortium type 1 diabetes data, SNP rs1412829 in the CDKN2A/B locus bordered on significance (P = 0.039) (odds ratio 0.929 [95% CI 0.867-0.995]), which did not reach the statistical significance threshold adjusted for 13 tests (alpha = 0.00385).
  
  
  CONCLUSIONS
  This study suggests that the type 2 diabetes loci do not play any obvious role in type 1 diabetes genetic susceptibility. The distinct molecular mechanisms of the two diseases highlighted the importance of differentiation diagnosis and different treatment principles.
authors.affiliation: Departments of Pediatrics and Human Genetics, McGill University, Montreal, Québec, Canada.
authors.forename: Hui-Qi
authors.initials: HQ
authors.lastname: Qu
authors.forename: Struan F A
authors.initials: SF
authors.lastname: Grant
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Bradfield
authors.forename: Cecilia
authors.initials: C
authors.lastname: Kim
authors.forename: Edward
authors.initials: E
authors.lastname: Frackelton
authors.forename: Hakon
authors.initials: H
authors.lastname: Hakonarson
authors.forename: Constantin
authors.initials: C
authors.lastname: Polychronakos
mesh_terms: D017668:Age of Onset; D002648:Child; D002675:Child, Preschool; D002874:Chromosome Mapping; D015331:Cohort Studies; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics*; D003924:Diabetes Mellitus, Type 2 / Q000235:genetics*; D003937:Diagnosis, Differential; D005190:Family; D005260:Female; D006801:Humans; D008297:Male; D010375:Pedigree; D020641:Polymorphism, Single Nucleotide; D012016:Reference Values; D044465:White People / Q000235:genetics