Predicting antigenic variants of influenza A/H3N2 viruses.

Predicting antigenic variants of influenza A/H3N2 viruses.
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DOI:
10.3201/eid1008.040107
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发表时间:
2004-08
影响因子:
11.8
通讯作者:
Chen JS
Chen JS
中科院分区:
医学2区
文献类型:
--
作者:
Lee MS;Chen JS

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对基于流感血凝素蛋白氨基酸变化的模型进行了比较,以预测甲型/H3N2流感病毒的抗原变异株。 当疫苗抗原与流行病毒在血凝素蛋白上具有高度相似性时,现有的灭活流感疫苗可提供保护。已提出血凝素蛋白中的五个抗原位点,并且在这五个抗原位点中已确定了131个氨基酸位置。此外,在血凝素蛋白中,分别有20个、18个和32个氨基酸位置被确定为小鼠单克隆抗体结合位点、正选择密码子和差异显著的密码子。我们研究了这些氨基酸位置以预测雪貂中甲型/H3N2流感病毒的抗原变异株。结果表明,基于五个抗原位点中氨基酸变化数量的模型最适合预测抗原变异株(一致性 = 83%)。本研究中描述的方法可用于预测疫苗在人体内诱导的交叉反应抗体应答,这可能会进一步改进疫苗株的选择。
Models based on amino acid changes in influenza hemagglutinin protein were compared to predict antigenic variants of influenza A/H3N2 viruses. Current inactivated influenza vaccines provide protection when vaccine antigens and circulating viruses share a high degree of similarity in hemagglutinin protein. Five antigenic sites in the hemagglutinin protein have been proposed, and 131 amino acid positions have been identified in the five antigenic sites. In addition, 20, 18, and 32 amino acid positions in the hemagglutinin protein have been identified as mouse monoclonal antibody–binding sites, positively selected codons, and substantially diverse codons, respectively. We investigated these amino acid positions for predicting antigenic variants of influenza A/H3N2 viruses in ferrets. Results indicate that the model based on the number of amino acid changes in the five antigenic sites is best for predicting antigenic variants (agreement = 83%). The methods described in this study could be applied to predict vaccine-induced cross-reactive antibody responses in humans, which may further improve the selection of vaccine strains.
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