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Minor H antigens: genes and peptides
1MRC Clinical Sciences Centre, Department of Immunology, Imperial College School of Medicine, Hammersmith Hospital, London, UK. elizabeth.simpson@csc.mrc.ac.uk
Summary
Minor histocompatibility (H) antigens are key targets in bone marrow transplants. Identifying their peptide epitopes aids in predicting and modulating immune responses like graft-versus-host disease.
Area of Science:
- Immunology
- Transplantation Biology
- Molecular Genetics
Background:
- Non-MHC histocompatibility (H) antigens are crucial in bone marrow transplantation.
- These antigens are significant targets for T-cell-mediated immune responses.
- Understanding their molecular identity is vital for transplant success.
Purpose of the Study:
- To review the evidence for non-MHC H antigens.
- To detail their molecular identity and MHC restriction.
- To discuss their role in T-cell responses and potential therapeutic modulation.
Main Methods:
- Review of existing evidence on non-MHC H antigens.
- Molecular identification of peptide epitopes, MHC restriction molecules, and encoding genes.
- Enumeration of T-cell responses using tetramer and ELISPOT assays.
Main Results:
- Identified peptide epitopes for human and murine minor H antigens.
- Detailed MHC restriction molecules and encoding genes.
- Established methods to enumerate T-cell responses to minor H antigens.
Conclusions:
- Molecular identification of minor H antigens enables precise analysis of immune responses (HVG, GVH, GVL).
- Potential exists for using minor H peptides to modulate immune responses in transplantation.
- Further research is needed to understand immunodominance factors for predicting transplant outcomes.