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HLA-G*0105N null allele encodes functional HLA-G isoforms
Magali Le Discorde1, Caroline Le Danff, Philippe Moreau
1Service de Recherches en Hémato-Immunologie, CEA-DSV-DRM, Institut d'Hématologie, Hôpital Saint-Louis, Paris 75010, France. teyssier@dsvidf.cea.fr
Biology of Reproduction
|April 9, 2005
Summary
The human leukocyte antigen (HLA)-G null allele, HLA-G*0105N, can still produce HLA-G proteins that maintain immune tolerance. These alternative HLA-G isoforms protect fetuses, tumors, and grafts from immune attack.
Area of Science:
- Immunology
- Genetics
- Molecular Biology
Background:
- The nonclassical human leukocyte antigen (HLA)-G plays a crucial role in immune tolerance.
- HLA-G is vital for maintaining pregnancy, enabling tumor immune evasion, and promoting graft acceptance.
- The HLA-G gene has 15 alleles, including the null allele HLA-G*0105N, which has a deletion preventing the synthesis of common HLA-G isoforms.
Purpose of the Study:
- To investigate whether the HLA-G*0105N null allele can produce functional HLA-G proteins.
- To determine if these alternative HLA-G isoforms can mediate immune tolerance.
Main Methods:
- Cloning of the genomic HLA-G*0105N DNA.
- Transfection of HLA-G*0105N DNA into an HLA-class I-positive human cell line.
- Assessment of HLA-G protein expression and functional activity against NK cell lysis.
Main Results:
- HLA-G proteins were detected in cells transfected with the HLA-G*0105N allele.
- These HLA-G proteins conferred protection against natural killer (NK) cell-mediated lysis.
- The findings suggest that alternative HLA-G isoforms can substitute for the canonical ones.
Conclusions:
- The HLA-G*0105N null allele can generate HLA-G isoforms that retain immune tolerogeneic functions.
- These alternative HLA-G molecules contribute to maternal-fetal tolerance, tumor immune escape, and allogeneic tissue acceptance.
- This highlights the adaptability of HLA-G in immune regulation.