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HLA-DRB1 alleles and Jk(a) immunization.
Denis Reviron1, Isabelle Dettori, Virginie Ferrera
1Department of Human Polymorphism, EFS Alpes-Méditerranée, Marseille, France.
Transfusion
|June 7, 2005
Summary
Certain HLA-DRB1 alleles, specifically HLA-DRB1*0101, *0102, and *1001, are linked to an increased risk of Jk(a) immunization. This finding is crucial for understanding and preventing hemolytic transfusion reactions in transfusion medicine.
Area of Science:
- Immunogenetics
- Transfusion Medicine
- HLA Systems
Background:
- Anti-Jk(a) antibodies can cause hemolytic transfusion reactions.
- Jk(a+) blood transfusions in Jk(a-) recipients do not always lead to anti-Jk(a) development.
- Identifying genetic predispositions is key to understanding immunization.
Purpose of the Study:
- To identify specific Human Leukocyte Antigen - DRB1 (HLA-DRB1) alleles associated with Jk(a) immunization.
- To investigate the genetic factors influencing immune responses to the Jk(a) blood group antigen.
Main Methods:
- Genotyping using polymerase chain reaction and sequence-specific oligonucleotide probe hybridization/primers.
- Comparison of HLA-DRB1 allele frequencies between 20 Jk(a)-immunized patients and 200 southern European controls.
Main Results:
- HLA-DRB1*01 was significantly more frequent in immunized patients (55%) versus controls (17%).
- A common B1 chain sequence (F13/R71/A74) in HLA-DRB1*0101, *0102, and *1001 was overrepresented in patients (65%) compared to controls (19.5%).
- Odds ratios indicated a strong association between these alleles/sequences and Jk(a) immunization.
Conclusions:
- HLA-DRB1*0101, DRB1*0102, and DRB1*1001 alleles are associated with an increased risk of Jk(a) immunization.
- These alleles share a common DRB1 sequence, suggesting a role in the immune response.
- Findings contribute to understanding genetic predispositions in transfusion medicine.