Previous Article | Next Article ![]()
Journal of Virology, February 2000, p. 1801-1809, Vol. 74, No. 4
CRC Institute for Cancer
Studies1 and Department of
Pathology,2 University of Birmingham,
Edgbaston, Birmingham B15 2TT, United Kingdom
Received 7 September 1999/Accepted 22 November 1999
Cytotoxic T-lymphocyte (CTL) responses to Epstein-Barr virus (EBV)
tend to focus on a few immunodominant viral epitopes; where these
epitope sequences are polymorphic between EBV strains, host CTL
specificities should reflect the identity of the resident strain. In
studying responses in HLA-B27-positive virus carriers, we identified 2 of 15 individuals who had strong CTL memory to the pan-B27 epitope
RRIYDLIEL (RRIY) from nuclear antigen EBNA3C but whose endogenous EBV
strain, isolated in vitro, encoded a variant sequence RKIYDLIEL (RKIY)
which did not form stable complexes with B27 molecules and which was
poorly recognized by RRIY-specific CTLs. To check if such individuals
were also carrying an epitope-positive strain (either related to or
distinct from the in vitro isolate), we screened DNA from freshly
isolated peripheral blood mononuclear cells for amplifiable virus
sequences across the EBNA3C epitope, across a different region of
EBNA3C with type 1-type 2 sequence divergence, and across a polymorphic
region of EBNA1. This showed that one of the unexplained RRIY
responders carried two distinct type 1 strains, one with an RKIY and
one with an RRIY epitope sequence. The other responder carried an
RKIY-positive type 1 strain and a type 2 virus whose epitope sequence
of RRIFDLIEL was antigenically cross-reactive with RRIY. Of 15 EBV-seropositive donors analyzed by such assays, 12 appeared to be
carrying a single virus strain, one was coinfected with distinct type 1 strains, and two were carrying both type 1 and type 2 viruses. This
implies that a small but significant percentage of healthy virus
carriers harbor multiple, perhaps sequentially acquired, EBV strains.
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Cytotoxic T-Lymphocyte Responses to a Polymorphic Epstein-Barr
Virus Epitope Identify Healthy Carriers with Coresident Viral
Strains
*
Corresponding author. Mailing address: CRC Institute
for Cancer Studies, University of Birmingham, Vincent Dr., Edgbaston, Birmingham B15 2TT, United Kingdom. Phone: 44-121-414-4492. Fax: 44-121-414-4486. E-mail: a.b.rickinson{at}bham.ac.uk.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»