Islet autoantibodies are associated with HLA-DQ genotypes in Han Chinese patients with type 1 diabetes and their relatives

Tissue Antigens. 2007 Nov;70(5):369-75. doi: 10.1111/j.1399-0039.2007.00916.x.

Abstract

The objective of this study was to explore the relationship between islet autoantibodies of glutamic acid decarboxylase (GADA), islet antigen-2A (IA-2A), insulin autoantibody (IAA), and human leukocyte antigen (HLA)-DQ genotypes in type 1 diabetes (T1D) patients and their first-degree relatives (FDRs). Cross-sectional and case-control study. Four hundred and ninety-five T1D patients, 419 FDRs, and 376 control subjects in Han Chinese populations were recruited and tested for GADA and IA-2A, while 71 cases, all FDRs and 300 controls were tested for IAA. The 338 T1D patients (including 187 antibody-positive and 151 antibody-negative patients), 173 FDRs and 278 controls were genotyped for HLA-DQ with polymerase chain reaction sequencing-based method. Compared with the control, the frequency of DQA1*03-DQB1*0303, DQA1*05-DQB1*0201, and DQA1*03-DQB1*0401 haplotypes was higher (P < 0.05-0.01) but DQA1*0102-DQB1*0602 haplotype was lower (P < 0.01) in T1D patients. DQA1*03 allele was less in the FDRs than in their probands (P < 0.05). GADA was more prevalent in T1D patients carrying DQA1*05-DQB1*0201 or DQA1*03-DQB1*0401 haplotype (55.8% vs 41.0%, 65.5% vs 40.3%, P < 0.05-0.01), whereas IA-2A presented more in the patients carrying DQA1*03-DQB1*0303 haplotype (27.0% vs 7.9%, P < 0.05-0.01), both GADA and IA-2A showed frequently in the patients with DQA1*03-DQB1*0303/DQA1*05-DQB1*0201 haplotypes (34.5% vs 9.7%, P < 0.01). GADA positivity was lower in the patients with DQA1*0102-DQB1*0602 haplotype (16.7% vs 45.9%, P < 0.05). The frequency of IAA was not different between patients with and without susceptible DQ haplotypes (P > 0.05). GADA, IA-2A or IAA presented frequently in FDRs with DQA1*03-DQB1*0303 haplotype. The findings in the study indicate that some of specific HLA-DQA1/-DQB1 genotypes and haplotypes not only confer susceptibility to T1D but also are associated with the presence of the islet autoantibodies in the Han Chinese population.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Asian Continental Ancestry Group
  • Autoantibodies / genetics
  • Autoantibodies / immunology*
  • Case-Control Studies
  • Child
  • Child, Preschool
  • China
  • Cross-Sectional Studies
  • Diabetes Mellitus, Type 1 / genetics*
  • Diabetes Mellitus, Type 1 / immunology*
  • Family
  • Female
  • Gene Frequency / immunology
  • Genetic Predisposition to Disease / genetics*
  • Genotype
  • Glutamate Decarboxylase / genetics
  • Glutamate Decarboxylase / immunology
  • HLA-DQ Antigens / genetics*
  • HLA-DQ Antigens / immunology
  • HLA-DQ alpha-Chains
  • HLA-DQ beta-Chains
  • Humans
  • Insulin Antibodies / genetics
  • Insulin Antibodies / immunology
  • Male
  • Membrane Glycoproteins / genetics*
  • Membrane Glycoproteins / immunology
  • Middle Aged
  • Receptor-Like Protein Tyrosine Phosphatases, Class 8 / genetics
  • Receptor-Like Protein Tyrosine Phosphatases, Class 8 / immunology

Substances

  • Autoantibodies
  • HLA-DQ Antigens
  • HLA-DQ alpha-Chains
  • HLA-DQ beta-Chains
  • HLA-DQA1 antigen
  • HLA-DQB1 antigen
  • Insulin Antibodies
  • Membrane Glycoproteins
  • islet cell antibody
  • PTPRN protein, human
  • Receptor-Like Protein Tyrosine Phosphatases, Class 8
  • Glutamate Decarboxylase