Related Experiment Video
Updated: Jun 28, 2025
08:07
Personalized Peptide Arrays for Detection of HLA Alloantibodies in Organ Transplantation
Published on: September 6, 2017
10.1K
Separating the Wheat from the Chaff among HLA-DQ Eplets.
Magali Devriese1,2, François A Lemonnier3, Julien Lion2
1Laboratoire d'Immunologie et Histocompatibilité, Hôpital Saint Louis, Paris, France.
Journal of Immunology (Baltimore, Md. : 1950)
|April 22, 2024
Summary
This study experimentally confirmed 24 of 29 unverified DQ eplets, crucial for understanding anti-HLA antibody reactivity in transplantation and improving organ transplant outcomes.
Area of Science:
- Immunology
- Transplantation immunology
- Molecular biology
Background:
- Anti-human leukocyte antigen (HLA) antibodies, particularly against the DQ locus, are significant contributors to organ transplant rejection.
- Eplets, specific amino acid epitopes on HLA molecules, are recognized by these antibodies and are identified using Luminex single antigen assays.
- The current HLA Eplet Registry contains 83 DQ eplets, but 66 lack experimental verification, hindering their clinical application in assessing eplet mismatch load for organ allocation.
Purpose of the Study:
- To experimentally validate 29 unverified DQ eplets to enhance the accuracy of eplet mismatch load assessment in transplantation.
- To confirm the reactivity of specific DQα and DQβ eplets using patient sera and engineered cell lines.
- To compare the performance of two commercial Luminex single antigen assays in identifying eplet reactivity.
Main Methods:
- Utilized serum adsorption techniques using human spleen mononuclear cells and murine cell clones expressing specific DQα-DQβ chain combinations to confirm eplet reactivity.
- Tested the reactivity of 29 previously unverified DQ eplets.
- Compared positive bead patterns from two commercially available Luminex single antigen assays.
Main Results:
- Successfully confirmed the reactivity of 24 out of 29 studied DQ eplets.
- Validated 7 DQα eplets (40E, 40ERV, 75I, 76 V, 129H, 129QS, 130A) and 17 DQβ eplets (including 3P, 23L, 45G, 56L, 57 V, 66DR, 66ER, 67VG, 70GT, 74EL, 86A, 87F, 125G, 130R, 135D, 167R, 185I).
- Could not confirm the reactivity of five eplets (66IT, 75S, 160D, 175E, 185T) based on the adsorption results.
Conclusions:
- The experimental validation of 24 DQ eplets significantly expands the repertoire of reliably identified epitopes involved in anti-HLA antibody responses.
- These confirmed eplets are critical for refining eplet mismatch calculations, potentially improving donor-recipient matching and long-term transplant survival.
- Further investigation may be needed for the five unconfirmed eplets to ascertain their clinical relevance in transplantation.
