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Major TCR repertoire perturbation by immunodominant HLA-B*44:03 - restricted CMV - specific T cells

Attaf, Meriem, Malik, Amna, Severinsen, Mai C., Roider, Julia, Ogongo, Paul, Buus, Søren, Ndung'u, Thumbi, Leslie, Alasdair, Kløverpris, Henrik N., Matthews, Philippa C., Sewell, Andrew K. and Goulder, Philip 2018. Major TCR repertoire perturbation by immunodominant HLA-B*44:03 - restricted CMV - specific T cells. Frontiers in Immunology , 2539. 10.3389/fimmu.2018.02539

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Lack of disease during chronic human cytomegalovirus (CMV) infection depends on the maintenance of a high-frequency CMV-specific T cell response. The composition of the T cell receptor (TCR) repertoire underlying this response remains poorly characterised, especially within African populations in which CMV is endemic from infancy. Here we focus on the immunodominant CD8+ T cell response to the immediate-early 2 (IE-2)-derived epitope NEGVKAAW (NW8) restricted by HLA-B*44:03, a highly prevalent response in African populations, which in some subjects represents >10% of the circulating CD8+ T cells. Using pMHC multimer staining and sorting of NW8-specific T cells, the TCR repertoire raised against NW8 was characterised here using high-throughput sequencing in 20 HLA-B*44:03 subjects. We found that the CD8+ T cell repertoire raised in response to NW8 was highly skewed and featured preferential use of a restricted set of V and J gene segments. Furthermore, as often seen in immunity against ancient viruses like CMV and Epstein-Barr virus (EBV), the response was strongly dominated by identical TCR sequences shared by multiple individuals, or “public” TCRs. Finally, we describe a pair “superdominant” TCR clonotypes, which were germline or nearly germline-encoded and produced at remarkably high frequencies in certain individuals, with a single CMV-specific clonotype representing up to 17% of all CD8+ T cells. Given the magnitude of the NW8 response, we propose that this major skewing of CMV-specific immunity leads to massive perturbations in the overall TCR repertoire in HLA-B*44:03 individuals

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Publisher: Frontiers Media
ISSN: 1664-3224
Date of First Compliant Deposit: 18 December 2018
Date of Acceptance: 15 October 2018
Last Modified: 05 Nov 2019 03:46

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