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Departments of
*
Sexually Transmitted Diseases and Immunology and
Molecular Pathology, University College London, London, United Kingdom;
Clinical Research Center Institute for Cancer Studies, University of Birmingham, Birmingham, United Kingdom; and
The Edward Jenner Institute for Vaccine Research, Compton, Berkshire, United Kingdom
We have applied a sensitive global analysis of TCR heterogeneity to compare clonal dynamics of CD4+ and CD8+ T cells in acute infectious mononucleosis. Using this approach, we are able to identify a broad representation of the total virus-specific population without the bias of in vitro culture and then to track their phenotype and fate by their unique molecular footprint. We demonstrate a large number of Ag-driven clones using different TCRs in the acute phase, all CD8+. The diverse large clones generated in the CD8 subset in response to this virus contrast with the complete lack of detectable clonal expansion in the CD4 compartment. Many of the same clones remain detectable in directly ex vivo CD8+ T cells for at least a year after resolution of infectious mononucleosis, although the clone size is reduced. Thus, memory CD8 cells following EBV infection persist at relatively high circulating frequency and represent a subset of the large range of clonotypes comprising the acute effectors. Separation of samples into CD45RA (naive) and CD45RO (memory) fractions shows the accumulation of identical CDR3 region defined clonotypes in both CD45RO and CD45RA fractions and sequencing confirms that dominant long-lived monoclonal expansions can reside in the CD45RA pool.
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