Molecular imprint of exposure to naturally occurring genetic variants of human cytomegalovirus on the T cell repertoire.

Molecular imprint of exposure to naturally occurring genetic variants of human cytomegalovirus on the T cell repertoire.
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DOI:
10.1038/srep03993
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发表时间:
2014-02-10
期刊:
影响因子:
4.6
通讯作者:
Khanna R
Khanna R
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Smith C;Gras S;Brennan RM;Bird NL;Valkenburg SA;Twist KA;Burrows JM;Miles JJ;Chambers D;Bell S;Campbell S;Kedzierska K;Burrows SR;Rossjohn J;Khanna R

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在临床环境中暴露于疱疹病毒的自然发生的变体可以对抗病毒免疫产生显著影响。在这里,我们已经评估了在人类巨细胞病毒(CMV)感染的T细胞库的变体肽-MHC复合物的分子印记,并证明与CMV的遗传变异的主要共同感染是一致的发展株特异性T细胞免疫随后出现的交叉反应性病毒特异性T细胞。交叉反应性CMV特异性T细胞表现出高度保守的公共T细胞库,而针对特定遗传变异的T细胞则表现出每个个体所特有的寡克隆库。T细胞识别足迹和pMHC-I结构分析显示,交叉反应性T细胞适应pMHC复合物中的改变,其中更广泛的足迹集中在肽表位的核心上。这些发现提供了新的分子洞察力,如何感染自然发生的遗传变异的持久性人类疱疹病毒印记的演变的抗病毒T细胞库。
Exposure to naturally occurring variants of herpesviruses in clinical settings can have a dramatic impact on anti-viral immunity. Here we have evaluated the molecular imprint of variant peptide-MHC complexes on the T-cell repertoire during human cytomegalovirus (CMV) infection and demonstrate that primary co-infection with genetic variants of CMV was coincident with development of strain-specific T-cell immunity followed by emergence of cross-reactive virus-specific T-cells. Cross-reactive CMV-specific T cells exhibited a highly conserved public T cell repertoire, while T cells directed towards specific genetic variants displayed oligoclonal repertoires, unique to each individual. T cell recognition foot–print and pMHC-I structural analyses revealed that the cross-reactive T cells accommodate alterations in the pMHC complex with a broader foot-print focussing on the core of the peptide epitope. These findings provide novel molecular insight into how infection with naturally occurring genetic variants of persistent human herpesviruses imprints on the evolution of the anti-viral T-cell repertoire.
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