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HLA-A and DPB1 loci confer susceptibility to Graves' disease
1Department of Genetics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.
Insights
This study identifies specific Human Leukocyte Antigen (HLA) alleles associated with Graves' disease in Japan. HLA-A2 and DPB1*0501 alleles show a significant synergistic effect, increasing the risk of developing this autoimmune condition.
Area of Science:
- Immunogenetics
- Human Leukocyte Antigen (HLA) complex
- Autoimmune diseases
Background:
- Graves' disease is an autoimmune disorder affecting the thyroid gland.
- Human Leukocyte Antigen (HLA) genes are known to influence susceptibility to autoimmune diseases.
- Previous studies suggest a role for HLA alleles in Graves' disease pathogenesis, but specific associations require further investigation.
Purpose of the Study:
- To investigate the association between specific Human Leukocyte Antigen (HLA) alleles and the pathogenesis of Graves' disease in a Japanese population.
- To identify potential genetic risk factors within the HLA system contributing to Graves' disease development.
Main Methods:
- Serologic typing was used to examine HLA-A, B, C, DR, and DQ specificities.
- DNA typing utilizing the PCR-SSOP method was employed to analyze HLA-DPB1 alleles.
- Case-control study involving 76 Graves' disease patients and 317 healthy controls from the Japanese population.
Main Results:
- Increased frequencies of HLA-A2, B46, Cw11, and DPB1*0501 were observed in patients compared to controls.
- Statistically significant increases in HLA-A2 (p<0.02) and DPB1*0501 (p<0.002) were confirmed after applying corrected p-values.
- Individuals with both DPB1*0501 and HLA-A2 exhibited the highest odds ratio (OR) of 10.5 for developing Graves' disease, suggesting a synergistic effect.
Conclusions:
- The Human Leukocyte Antigen (HLA) class I allele HLA-A2 and the HLA class II allele DPB1*0501 are significantly associated with Graves' disease in the Japanese population.
- A synergistic interaction between HLA-A2 and DPB1*0501 appears to play a crucial role in the pathogenesis of Graves' disease.
- These findings highlight the importance of specific HLA alleles as genetic determinants in the development of Graves' disease.
Abstract:
To investigate HLA-linked genetic factors involved in the pathogenesis of Graves' disease, 76 patients and 317 healthy controls in the Japanese population were examined for HLA-A, B, C, DR, and DQ specificities by serologic typing and for HLA-DPB1 alleles by DNA typing by using the PCR-SSOP method. The frequencies of HLA-A2, B46, Cw11, and DPB1*0501 were increased and those of HLA-A24, B7, Bw52, and DR1 were decreased in the patients. The increased frequencies of HLA-A2 and DPB1*0501 in the patients were statistically significant when the corrected p value (pc) was applied (pc < 0.02 and pc < 0.002, respectively). ORs for a risk to develop the disease were calculated among individuals positive for DPB1*0501 and/or HLA-A2, and the highest OR (10.5) was observed in individuals possessed both DPB1*0501 and HLA-A2. This observation suggests a synergic involvement of a HLA class II allele (DPB1*0501) and an HLA class I allele (HLA-A2) in the pathogenesis of Graves' disease.