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Molecular epidemiological study of human coronavirus OC43 in Shanghai from 2009-2016



Molecular epidemiological study of human coronavirus OC43 in Shanghai from 2009-2016



Zhonghua Yu Fang Yi Xue Za Zhi 52(1): 55-61



目的: 分析上海2009年11月至2016年4月人冠状病毒(HCoV)流行特征,以及HCoV-OC43基因型分布和变异变迁规律。 方法: 收集2009年11月至2016年4月期间上海7家哨点医院感染科急性呼吸道感染患者的临床资料和呼吸道样本,包括咽拭子、痰、鼻咽抽吸物和肺泡灌洗液,共6 059例。采用HCoV通用引物对患者样本进行检测并测序分型。HCoV-OC43阳性样本进一步采用特异性引物对刺突蛋白、依赖RNA的RNA聚合酶(RDRP)和核衣壳蛋白全基因进行扩增和测序,并通过全基因序列构建进化树对HCoV-OC43进行基因分型和进化分析。 结果: 共检出HCoV 63株(1.04%),其中HCoV-OC43检出数最多,为34株,其后依次是HCoV-229E和HCoV-HKU1,检出数分别为18和10株,而HCoV-NL63、重症急性呼吸综合征冠状病毒(SARS-CoV)和中东呼吸综合征冠状病毒(MERS-CoV)均未检出。29例HCoV-OC43阳性样本获得刺突蛋白、RDRP和核衣壳蛋白全基因序列,根据进化树分析显示,其中27例为D型,2例为B型,而其他基因型E、F、G均未检出,其中D型为主导基因型。进一步分析与HCoV-OC43进入宿主和中和抗体产生相关的刺突蛋白发现,刺突蛋白重要的功能结构域——N端结构域(NTD)和受体结合结构域(RBD)含有较多氨基酸变异和阳性选择位点,并伴有氨基酸插入/缺失。13个阳性选择位点均位于NTD或RBD,其中10个位于NTD,3个位于RBD。 结论: 2009—2016年,上海流行的HCoV主要为HCoV-OC43,其中D型为优势基因型。刺突蛋白的NTD区和RBD区是HCoV-OC43进化过程中的高变区域,伴有氨基酸替换、氨基酸插入/缺失。.

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PMID: 29334709


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