适应HIV-1的人类白细胞抗原I类
Yuka Kawashima1, Katja Pfafferott, John Frater
1Division of Viral Immunology, Center for AIDS Research, Kumamoto University, 2-2-1 Honjo, Kumamoto 860-0811, Japan.
Nature
|February 27, 2009
概括
人类免疫缺陷病毒 (HIV) 迅速适应人类白细胞抗原 (HLA) 免疫反应. 这种由宿主-病原体共同进化驱动的病毒进化,挑战了HLA类型和HIV控制之间的既定关联.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 遗传学 是一个遗传学.
背景情况:
- 人类免疫缺陷病毒 (HIV) 流行病为研究宿主-病原体共同进化的研究提供了一个独特的模型.
- 人类白细胞抗原 (HLA) 分子在向CD8(+) T细胞呈现HIV衍生的表位上发挥着关键作用,影响病毒控制.
- 特定的HLA基因,包括HLA-B*57,HLA-B*27和HLA-B*51,与更好的HIV感染控制有关,但病毒突变可能导致免疫逃逸.
研究的目的:
- 研究艾滋病毒在对人类白细胞抗原 (HLA) 压力的反应中对人口水平的适应.
- 分析特定HLA等位基因的流行率与不同全球队列中相应的HIV脱离突变的频率之间的相关性.
主要方法:
- 来自9个国际研究队伍的2800多名受试者的病毒序列和HLA等位基因的分析.
- 统计相关性分析,以评估HLA等位基因频率和HIV表位突变频率之间的关系.
主要成果:
- 在TAFTIPSI表位 (P = 0.0001) 中,观察到HLA-B*51的流行率与其相关逃生突变 (I135X) 的频率之间存在显著的相关性 (P = 0.0001).
- 在由HLA-B*57和HLA-B*27限制的14个明确的CD8(+) T细胞表位中,表位变异频率与各自限制HLA等位基因的流行率一致相关 (P < 0.0001).
- 这些发现表明,艾滋病毒在人口层面上对HLA进行了实质性的适应.
结论:
- 艾滋病毒在不同的人群中对HLA免疫压力表现出显著的适应.
- 这种病毒适应可能会破坏特定的HLA等位基因对HIV控制的保护作用.
- 由艾滋病毒适应驱动的不断变化的免疫学格局对疫苗开发构成了挑战.
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