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. 1996 Apr;70(4):2490–2496. doi: 10.1128/jvi.70.4.2490-2496.1996

Unusually high frequency of Epstein-Barr virus genetic variants in Papua New Guinea that can escape cytotoxic T-cell recognition: implications for virus evolution.

J M Burrows 1, S R Burrows 1, L M Poulsen 1, T B Sculley 1, D J Moss 1, R Khanna 1
PMCID: PMC190093  PMID: 8642677

Abstract

Cytotoxic T lymphocytes (CTLs) which recognize viral antigens in association with human leukocyte antigens (HLAs) play an important role in controlling persistent virus infections. These viruses use several mechanisms to evade the immune response, including mutations that affect either T-cell receptor recognition or binding of viral epitopes to the HLA. It has recently been proposed that the distribution of HLA frequencies and the specific CTL response may influence the long-term evolution of Epstein-Barr virus (EBV) by selecting variants which lack immunodominant CTL epitopes. To test this hypothesis, we have studied EBV isolates from two genetically distinct Papua New Guinea (PNG) populations, residing in coastal and highland regions, for polymorphism within seven viral CTL epitope sequences restricted through several class I HLAs. Surprisingly, all EBV isolates analyzed displayed identical amino acid substitutions within HLA A11-, B35- and B8-restricted CTL epitope sequences which completely abrogated CTL recognition and binding of synthetic peptides to HLA molecules. Furthermore, these substitutions revealed no correlation with the contemporary distribution of HLAs in the different PNG populations, which argues for a minimal influence of immune pressure. The sequence homology between EBV isolates from coastal and highland PNG suggests that the virus may have had a single origin and, more importantly, that these isolates are genetically distinct from those present in a Caucasian population.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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