Prevalence and HLA association of GAD65 antibodies in Hungarian schoolchildren

Hum Immunol. 2003 Jan;64(1):152-5. doi: 10.1016/s0198-8859(02)00686-9.

Abstract

Pancreas beta-cell autoantibodies are important tools in prediction of type 1 diabetes, however, background frequencies of these markers reveal considerable population-specific variations. The aim of current study was to determine the frequency of glutamic acid decarboxylase (65kD) antibodies (GADA) in healthy Hungarian schoolchildren (n = 2,664) and to correlate development of GADA with HLA DQ genotypes. GADA was determined using a radioligand assay (cut-off limit: 97.5th percentile); HLA DQ genotypes were identified with allele-specific polymerase chain reaction. Thirty-five children (1.3%) tested positive for GADA among which the proportion of girls was significantly higher when compared with boys (1.8% and 0.8%, p = 0.03). The study population was followed for 5.2 years and one girl in the whole cohort, who tested positive for GADA, has developed diabetes. HLA DQ2/DQ8 and DQ2/y genotypes (where y not equal DQB1*0302, *0301, *0602, *0603) were significantly more prevalent in the GADA positive group than in antibody negative children (17.1% vs 1.7%, p = 0.0003 and 25.7% vs 10.3%, p = 0.027, respectively). In conclusion, the prevalence of GADA in the Hungarian general population is in the middle of the range found in other Caucasian ethnic groups. Individuals carrying HLA DR3-DQ2 haplotype and females were more prone to develop GADA. We suggest that for future screening programs it is important to determine predictive value of islet-cell antibodies in populations with varying disease incidence.

MeSH terms

  • Adolescent
  • Autoantibodies / blood*
  • Child
  • Diabetes Mellitus, Type 1 / enzymology
  • Diabetes Mellitus, Type 1 / genetics
  • Diabetes Mellitus, Type 1 / immunology*
  • Female
  • Glutamate Decarboxylase / immunology*
  • HLA-DQ Antigens / genetics*
  • HLA-DR3 Antigen / genetics
  • Humans
  • Hungary / epidemiology
  • Isoenzymes / immunology*
  • Male
  • Polymerase Chain Reaction
  • Predictive Value of Tests
  • Prevalence

Substances

  • Autoantibodies
  • HLA-DQ Antigens
  • HLA-DR3 Antigen
  • Isoenzymes
  • Glutamate Decarboxylase
  • glutamate decarboxylase 2