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Polymorphism of HLA-DMA and DMB alleles in patients with systemic lupus erythematosus
Jacques Morel1, Clarisse Da Silva Simoes, Odile Avinens
1Service d'Immunorhumatologie, Hôpital Lapeyronie, Montpellier, France. j-morel@chu-montpellier.fr
Insights
This study suggests HLA-DMA*0104 may be a novel susceptibility allele for systemic lupus erythematosus (SLE) in Caucasians. Further research is needed to confirm its role in SLE pathogenesis.
Area of Science:
- Immunogenetics
- Autoimmune Diseases
Background:
- Systemic lupus erythematosus (SLE) is a complex autoimmune disease with a significant genetic component.
- Human Leukocyte Antigen (HLA) genes are known to influence SLE susceptibility.
- The role of HLA-DM alleles in SLE pathogenesis remains underexplored in Caucasian populations.
Purpose of the Study:
- To investigate the association between specific HLA-DM alleles (HLA-DMA and HLA-DMB) and susceptibility to SLE.
- To evaluate the contribution of these alleles in a Caucasian cohort.
Main Methods:
- Oligotyping of polymerase chain reaction amplified genomic DNA was used to analyze HLA-DMA and DMB alleles.
- Study included 73 SLE patients, 147 general controls, and 86 HLA-DRB1 matched controls.
- Stratification by HLA-DRB1 genotypes was performed to refine the analysis.
Main Results:
- Significant presence of HLA-DMA*0103, DMA*0104, and DMB*0102 alleles observed in SLE patients compared to general controls.
- HLA-DMA*0104 was notably increased in SLE patients lacking known SLE-susceptibility HLA-DR alleles.
- No significant association found between HLA-DM phenotypes and clinical/biological SLE manifestations.
Conclusions:
- This is the first study to examine HLA-DM allele influence in a Caucasian SLE population.
- Results indicate HLA-DMA*0104 may be a novel susceptibility allele for SLE.
- Further investigation is warranted to elucidate the specific mechanisms of HLA-DM in SLE development.
Objective:
To evaluate the contribution of HLA-DM alleles to susceptibility to systemic lupus erythematosus (SLE) in a Caucasian population.
Methods:
HLA-DMA and DMB alleles were studied in 73 patients with SLE, 147 randomly selected controls, and 86 HLA-DRB1 genotype matched controls by oligotyping of polymerase chain reaction amplified genomic DNA with sequence-specific oligonucleotide probes.
Results:
There was a significant presence of HLA-DMA*0103, DMA*0104, and DMB*0102 in the SLE patients compared with the randomly selected controls. After stratification of patients and matched controls according to DRB1 genotypes, only HLA-DMA*0104 was increased in SLE patients negative for the SLE susceptibility HLA-DR alleles. For the patients and controls positive for HLA-DR allele-susceptibility for SLE, HLA-DMA*0103, DMA*0104, DMB*0102, and DMB*0103 alleles tended to be more frequent, but without reaching statistical significance. No correlation was found between HLA-DM phenotype frequencies and any clinical or biological manifestations of SLE.
Conclusion:
This is the first study evaluating the influence of HLA-DM in a Caucasian SLE population. Our results suggest that HLA-DMA*0104 may represent a novel allele of susceptibility to SLE.
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