HLA-class II and class I genotypes among Japanese children with Type 1A diabetes and their families.

Abstract

OBJECTIVE:

To determine the HLA-DRB1, DQB1, DPB1, A, C, and B genotypes among Japanese children with autoimmune type 1 diabetes.

METHODS:

Four hundred and thirty patients who were GADAb and/or IA-2Ab-positive (Type 1A) were recruited from 37 medical centers as part of a nationwide multicenter collaborative study. DNA samples from 83 siblings of the children with Type 1A diabetes and 149 parent-child trios were also analyzed. A case-control study and a transmission disequilibrium test (TDT) were then performed.

RESULTS:

The susceptible and protective DRB1 and DQB1 alleles and haplotypes were confirmed. DPB1 alleles unique to the Japanese population and those common to multiple ethnic groups were also present. A linkage disequilibrium (LD) analysis showed both susceptible and protective haplotypes. The TDT did not reveal any alleles that were transmitted preferentially from the mother or father to children with Type 1A. Homozygosity for DRB1-09:01-DQB1-03:03 and heterozygosity for DRB1-04:05-DQB1-04:01 and DRB1-08:02-DQB1-03:02 were associated with an extremely high risk of Type 1A. A comparison of children with Type 1A and their parents and siblings suggested a dose effect of susceptible DRB1-DQB1 haplotypes and an effect of protective alleles on immunological pathogenesis. DRB1-09:01 appeared to be strongly associated with an early onset in preschool children with Type 1A diabetes.

CONCLUSIONS:

This study demonstrated the characteristic association of HLA-class II and class I genes with Type 1A diabetes among Japanese children. A TDT did not reveal the genomic imprinting of HLA-class II and class I genes in Type 1A diabetes.

• Authors: Shigetaka Sugihara, Tsutomu Ogata, Tomoyuki Kawamura, Tatsuhiko Urakami, Koji Takemoto, Nobuyuki Kikuchi, Noriyuki Takubo, Kohji Tsubouchi, Reiko Horikawa, Kisho Kobayashi, Yoshihito Kasahara, Tohru Kikuchi, Akemi Koike, Takahiro Mochizuki, Kanshi Minamitani, Ryuzo Takaya, Hiroshi Mochizuki, Aki Nishii, Ichiro Yokota, Zenro Kizaki, Tetsuo Mori, Naoto Shimura, Tokuo Mukai, Nobuo Matsuura, Takao Fujisawa, Kenji Ihara, Kitaro Kosaka, Rika Kizu, Toshikazu Takahashi, Satoshi Matsuo, Keiichi Hanaki, Yutaka Igarashi, Goro Sasaki, Shun Soneda, Shinichi Teno, Susumu Kanzaki, Hiroh Saji, Katsushi Tokunaga, Shin Amemiya, Japanese Study Group of Insulin Therapy for Childhood and Adolescent Diabetes (JSGIT)
• Journal: Pediatric diabetes (Pediatr Diabetes) Vol. 13 Issue 1 Pg. 33-44 (Feb 2012) ISSN: 1399-5448 [Electronic] Denmark
• PMID: 22128760 (Publication Type: Journal Article, Multicenter Study, Research Support, Non-U.S. Gov't)
• Copyright: © 2011 John Wiley & Sons A/S.

Topics

• Adolescent
• Asian People (genetics, statistics & numerical data)
• Child
• Child, Preschool
• DNA Mutational Analysis
• Diabetes Mellitus, Type 1 (classification, ethnology, genetics)
• Family
• Female
• Genes, MHC Class I (genetics)
• Genes, MHC Class II (genetics)
• Genotype
• Humans
• Infant
• Infant, Newborn
• Male