The Journal of Experimental Medicine
ThymUS '08
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Published online 14 November 2005 doi:10.1084/jem.20051357
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 202, Number 10, 1349-1361
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ARTICLE

Avidity for antigen shapes clonal dominance in CD8+ T cell populations specific for persistent DNA viruses

David A. Price1, Jason M. Brenchley1, Laura E. Ruff1, Michael R. Betts2, Brenna J. Hill1, Mario Roederer3, Richard A. Koup2, Steven A. Migueles4, Emma Gostick5, Linda Wooldridge5, Andrew K. Sewell5, Mark Connors4, and Daniel C. Douek1

1 Human Immunology Section, Vaccine Research Center
2 Immunology Laboratory, Vaccine Research Center
3 Immunotechnology Section, Vaccine Research Center
4 Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
5 Nuffield Department of Clinical Medicine, University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, England, UK

CORRESPONDENCE David A. Price: davidprice{at}nih.gov OR Daniel C. Douek: ddouek{at}nih.gov

The forces that govern clonal selection during the genesis and maintenance of specific T cell responses are complex, but amenable to decryption by interrogation of constituent clonotypes within the antigen-experienced T cell pools. Here, we used point-mutated peptide–major histocompatibility complex class I (pMHCI) antigens, unbiased TCRB gene usage analysis, and polychromatic flow cytometry to probe directly ex vivo the clonal architecture of antigen-specific CD8+ T cell populations under conditions of persistent exposure to structurally stable virus-derived epitopes. During chronic infection with cytomegalovirus and Epstein-Barr virus, CD8+ T cell responses to immunodominant viral antigens were oligoclonal, highly skewed, and exhibited diverse clonotypic configurations; TCRB CDR3 sequence analysis indicated positive selection at the protein level. Dominant clonotypes demonstrated high intrinsic antigen avidity, defined strictly as a physical parameter, and were preferentially driven toward terminal differentiation in phenotypically heterogeneous populations. In contrast, subdominant clonotypes were characterized by lower intrinsic avidities and proportionately greater dependency on the pMHCI–CD8 interaction for antigen uptake and functional sensitivity. These findings provide evidence that interclonal competition for antigen operates in human T cell populations, while preferential CD8 coreceptor compensation mitigates this process to maintain clonotypic diversity. Vaccine strategies that reconstruct these biological processes could generate T cell populations that mediate optimal delivery of antiviral effector function.


Abbreviations used: pMHC, peptide-MHC; pMHCI, pMHC class I.


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