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CD8+ T cell-based strong selective pressure on multiple simian immunodeficiency virus targets in macaques possessing a protective MHC class I haplotype

Author:
Trang Thi Thu Hau, Midori Nakamura-Hoshi, Yoshiaki Kanno, Takushi Nomura, Masako Nishizawa, Sayuri Seki, Hiroshi Ishii, Ai Kawana-Tachikawa, William W. Hall, Lan Anh Nguyen Thi, Tetsuro Matano, Hiroyuki Yamamoto
Source:
Biochemical and biophysical research communications 2019 v.512 no.2 pp. 213-217
ISSN:
0006-291X
Subject:
CD8-positive T-lymphocytes, Human immunodeficiency virus, Macaca mulatta, Simian immunodeficiency virus, alleles, antigens, haplotypes, major histocompatibility complex, mutation, nucleotide sequences, virus replication
Abstract:
In human immunodeficiency virus (HIV) and simian immunodeficiency virus (SIV) infections, host major histocompatibility complex class I (MHC-I) genotypes have a great impact on viral replication and MHC-I-associated viral genome mutations are selected under CD8+ T-cell pressure. Association of MHC-I genotypes with HIV/SIV control has been investigated at MHC-I allele levels but not fully at haplotype levels. We previously established groups of rhesus macaques sharing individual MHC-I haplotypes. In the present study, we compared viral genome diversification after SIV infection in macaques possessing a protective MHC-I haplotype, 90-010-Id, with those possessing a non-protective MHC-I haplotype, 90-010-Ie. These two MHC-I haplotypes are associated with immunodominant CD8+ T-cell responses targeting similar regions of viral Nef antigen. Analyses of viral genome sequences and antigen-specific T-cell responses showed four and two candidates of viral CD8+ T-cell targets associated with 90-010-Id and 90-010-Ie, respectively, in addition to the Nef targets. In these CD8+ T-cell target regions, higher numbers of mutations were detected at the setpoint after SIV infection in macaques possessing 90-010-Id than those possessing 90-010-Ie. These results indicate higher selective pressure on overall CD8+ T-cell targets associated with the protective MHC-I haplotype, suggesting a pattern of HIV/SIV control by multiple target-specific CD8+ T-cell responses.
Agid:
6334555