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HLA-DR2 Frequency Increase in Severe Aplastic Anemia Patients is Mainly Attributed to the Prevalence of DR15 Subtype
Sergey I Kapustin1, Tamara I Popova, Anton A Lyschov
1Institute of Haematology and Transfusiology, Laboratory of Biochemistry, St.-Petersburg, Russia.
Abstract:
The association between severe aplastic anemia (AA) and DR2 antigen seems to be well established. However, since discrimination between two DR2-associated splits, namely DR15 and DR16, rarely was performed, it remains unclear whether one or both of these subvariants are responsible for AA susceptibility. In this study, we have analyzed the HLA-DR allelic distribution in a group of 37 AA patients of slavic origin from North-Western Russia. The experimental design included PCR-based amplification of DRB-specific sequences, followed by reverse dot-blot hybridization of the biotinylated PCR-product with the set of sequence-specific oligonucleotide probes. HLA-DRB alleles were identified by non-radioactive enzymatic reaction, then standard serological specificities of HLA-DR antigen were estimated according to the WHO nomenclature. Whereas DR15 subtype occurred more often in the patients (23.0% vs. 13.3%, p< 0.05), DR16 split did not show the same tendency. The results, show the overall predominance of HLA-DR2 specificity (DR15+DR16) did not reach statistical significance (24.4% vs.17.5%, p<0.2). Thus, we conclude that repeatedly reported DR2 frequency increase in AA patients is mainly attributed to the prevalence of DR15 subtype.
Insights
Severe aplastic anemia (AA) is linked to the DR2 antigen. This study found that the DR15 subtype, not DR16, is primarily responsible for increased AA susceptibility in Slavic populations.
Area of Science:
- Immunogenetics
- Hematology
Background:
- The association between severe aplastic anemia (AA) and the Human Leukocyte Antigen (HLA) DR2 antigen is recognized.
- However, the specific DR2 subtypes, DR15 and DR16, contributing to AA susceptibility have not been clearly defined.
Purpose of the Study:
- To investigate the allelic distribution of HLA-DRB genes in severe aplastic anemia patients of Slavic origin.
- To determine whether HLA-DR15 or HLA-DR16 is specifically associated with AA susceptibility.
Main Methods:
- Analysis of HLA-DRB allele distribution in 37 Slavic AA patients.
- Utilized PCR-based amplification and reverse dot-blot hybridization for HLA-DRB typing.
- Identified alleles using non-radioactive enzymatic reactions and WHO nomenclature.
Main Results:
- The DR15 subtype was found significantly more often in AA patients (23.0%) compared to controls (13.3%, p<0.05).
- No significant difference in the frequency of the DR16 subtype was observed between patients and controls.
- The overall DR2 (DR15+DR16) frequency did not reach statistical significance in the patient group (24.4% vs. 17.5%, p<0.2).
Conclusions:
- The increased frequency of HLA-DR2 in severe aplastic anemia patients is primarily driven by the DR15 subtype.
- This finding refines our understanding of the specific immunogenetic factors contributing to AA pathogenesis in Slavic populations.