title: Reevaluation of human leukocyte antigen DR-DQ haplotype and genotype in type 1 diabetes in the Japanese population.
abstract: OBJECTIVE
  This study aims at clarifying the human leukocyte antigen haplotypes and genotypes conferring susceptibility or resistance to type 1 diabetes in the Japanese population.
  
  
  METHODS
  The frequencies of human leukocyte antigen DR-DQ haplotypes and genotypes were compared between 83 type 1 diabetic patients, except for fulminant type 1 diabetes, and control subjects in the Japanese population. The patients were divided by onset age into four groups (ages 5-14, 15-29, 30-49, and 50-71 years); the haplotype frequency was compared between each group.
  
  
  RESULTS
  The frequencies of DRB1*0405-DQB1*0401 (DR4), DRB1*0802-DQB1*0302 (DR8), DRB1*0901-DQB1*0303 (DR9), and DRB1*1302-DQB1* 0604 (DR13) haplotypes were significantly higher in the patients than in the control subjects. The frequencies of DRB1* 1501-DQB1*0602 and DRB1*1502-DQB1*0601 haplotypes were significantly lower in the patients than in the controls. The frequencies of DR4/8, DR4/13, DR9/9, and DR9/13 genotypes were significantly higher in the patients than in the control subjects. The DR13 haplotype was the most frequent haplotype in the age group 30-49 years, whereas the other haplotypes but DR13 were the most frequent in the other age groups.
  
  
  CONCLUSIONS
  DR4, DR8, DR9, and DR13 haplotypes confer susceptibility to type 1 diabetes in Japanese patients.
authors.affiliation: Department of Endocrinology, Ichinomiya Municipal Hospital, Ichinomiya, Japan. katahira-0034@umin.net
authors.forename: Masahito
authors.initials: M
authors.lastname: Katahira
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Ishiguro
authors.forename: Satoko
authors.initials: S
authors.lastname: Segawa
authors.forename: Kaoru
authors.initials: K
authors.lastname: Kuzuya-Nagao
authors.forename: Iwao
authors.initials: I
authors.lastname: Hara
authors.forename: Tsuneo
authors.initials: T
authors.lastname: Nishisaki
mesh_terms: D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D005828:Genetics, Population; D005838:Genotype; D006683:HLA-DQ Antigens / Q000235:genetics*; D059866:HLA-DQ beta-Chains; D006684:HLA-DR Antigens / Q000235:genetics*; D059811:HLA-DRB1 Chains; D006239:Haplotypes; D006801:Humans; D007564:Japan; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics; D008875:Middle Aged
chemical_list: D006683:HLA-DQ Antigens; D059866:HLA-DQ beta-Chains; C069051:HLA-DQB1 antigen; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains; D008562:Membrane Glycoproteins