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HLA class I peptide polymorphisms contribute to class II DQβ0603:DQα0103 antibody specificity.
Shih et al., Nat Commun 2024
DOI: 10.1038/s41467-024-44912-0
What’s New: The study identifies that peptides from the HLA class I heavy chain (amino acids 119-148) can bind to the HLA class II molecule DQβ0603:DQα0103, influencing antibody reactivity in a way that is dependent on the HLA-DM process and the specific amino acid sequence presented.
Importance: This discovery challenges the current understanding of antibody reactivity in transplant immunology, particularly for antibodies that do not align with known amino acid motifs. It highlights a novel aspect of HLA epitope matching that could affect transplant outcomes.
Contribution to Literature: The findings contribute to a more nuanced view of HLA antibody reactivity, suggesting that polymorphic HLA class I peptides presented by class II proteins can be involved in antibody binding. This insight could lead to improved epitope matching algorithms and better transplant success rates by considering these previously unrecognized interactions.