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Published on: October 25, 2018
Anti-"Mi(a)" immunization is associated with HLA-DRB1*0901
Chen-Chung Chu1, Hsin-Tsung Ho, Hui-Lin Lee
1Transfusion Medicine Laboratory, Medical Research Department, Mackay Memorial Hospital, Taipei, Taiwan.
The HLA-DRB1*0901 allele is more common in individuals with anti-"Mi(a)" antibodies, suggesting a genetic link to the production of this irregular red blood cell antibody.
Area of Science:
- Immunogenetics
- Hematology
- Red Blood Cell Alloimmunization
Background:
- Anti-"Mi(a)" is a significant irregular red blood cell antibody in Taiwan.
- Understanding genetic predispositions for antibody production is crucial for transfusion medicine.
Purpose of the Study:
- To investigate the association between specific Human Leukocyte Antigen - DRB1 (HLA-DRB1) alleles and the production of anti-"Mi(a)" antibodies.
- To identify potential genetic risk factors for developing anti-"Mi(a)" alloimmunization.
Main Methods:
- A case-control study involving 68 anti-"Mi(a)" positive patients and 219 controls.
- HLA-DRB1 genotyping using sequence-based typing.
- Statistical analysis using Fisher's exact test to determine the significance of associations.
Main Results:
- The frequency of the HLA-DRB1*0901 allele was significantly higher in the anti-"Mi(a)" group (30%) compared to the control group (16%).
- An odds ratio of 2.27 (95% CI, 1.44-3.55; p = 0.0005) indicated a strong association between HLA-DRB1*0901 and anti-"Mi(a)" presence.
Conclusions:
- HLA-DRB1*0901 is significantly more prevalent in patients with anti-"Mi(a)" antibodies.
- This suggests that individuals with the DR9 phenotype may more effectively present "Mi(a)" antigen peptides, potentially leading to alloimmunization.
- Specific epitopes on MiIII glycophorin may preferentially bind to the DR9 molecule, warranting further investigation.
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