Am J Epidemiol 2002; 156:787-796.
Copyright © 2002 by Johns
Hopkins Bloomberg School of Public Health
ORIGINAL CONTRIBUTIONS |
HLA-DQ Genotypes in Classic Type 1 Diabetes and in Latent Autoimmune Diabetes of the Adult
1 Department of Medicine, Varberg Hospital-Kungsbacka, Göteborg University, Göteborg, Sweden.
2 Department of Medicine, Skövde Central Hospital, Skövde, Sweden.
3 Department of Endocrinology, University Hospital, Malmö, Sweden.
4 Department of Clinical Chemistry, University Hospital, Malmö, Sweden.
5 Department of Epidemiology, University of Pittsburgh, Pittsburgh, PA.
In 1993–1996, islet autoantibodies, C-peptide, and HLA-DQ genotypes were evaluated in 345 insulin-treated diabetic patients of all ages from the Skaraborg Diabetes Registry 5–6 years after their diagnosis and in 216 control subjects from the Skaraborg County, Sweden, population. The aims of this study were to clarify the importance of age at diagnosis of diabetes for HLA-DQ associations in patients with classic type 1 diabetes and whether patients considered to have latent autoimmune diabetes of the adult differed in their human leukocyte antigen (HLA) associations. An abnormally low fasting C-peptide value was used as the definition of type 1 diabetes, found in 182 of 345 (53%) patients. No major associations between age at diagnosis and HLA susceptibility or protective genotypes were detected in type 1 diabetic patients. Among the 163 patients with preserved ß-cell function, the frequency of HLA protective genotypes was clearly decreased (5% vs. 42%) in the 46 of 163 with islet antibodies compared with the 117 of 163 antibody-negative patients. The authors conclude that there were no major effects of age at diagnosis on HLA-DQ associations in classic type 1 diabetic patients, whereas lack of HLA-DQ protective genotypes was a feature of patients with slow-progressing type 1 diabetes (latent autoimmune diabetes of the adult).
autoantibodies; C-peptide; diabetes mellitus, insulin-dependent; diabetes mellitus, non-insulin-dependent; HLA-DQ antigens; islets of Langerhans
Abbreviations: Abbreviations: Ab+, with islet antibodies; Ab–, without islet antibodies; CI, confidence interval; CPEP-LOW, fasting serum C-peptide level of less than or equal to 0.24 nmol/liter; CPEP-NORM, fasting serum C-peptide level of greater than 0.24 nmol/liter; HLA, human leukocyte antigen; LADA, latent autoimmune diabetes in the adult; OR, odds ratio; SD, standard deviation.
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