Cell Host & Microbe:解析H7N9的传播

2013-09-24 佚名 生物通

来自中科院生物物理研究所,扬州大学等处的研究人员发表了题为“Sequential Reassortments Underlie Diverse Influenza H7N9 Genotypes in China”的文章,通过对病毒基因组进行测序,揭示了类似H7N9这样的A型禽流感病毒的传播途径,并从中整合出了这种病原体的进化历史。 这一研究成果公布在9月19日Cell出版社旗下Cell Hos

来自中科院生物物理研究所,扬州大学等处的研究人员发表了题为“Sequential Reassortments Underlie Diverse Influenza H7N9 Genotypes in China”的文章,通过对病毒基因组进行测序,揭示了类似H7N9这样的A型禽流感病毒的传播途径,并从中整合出了这种病原体的进化历史。

这一研究成果公布在9月19日Cell出版社旗下Cell Host & Microbe杂志上,指出两个基因重组事件也许就是导致这种病毒遗传多样性的原因所在。【原文下载

文章的通讯作者是生物物理所“百人计划”入选者蒋太交研究员,以及扬州大学兽医学院彭大新教授,前者主要从事计算生物学和系统医学方面的研究,后者主要研究方向包括两个:病原的分子致病机理与免疫机制,以及疫苗和诊断试剂的研制与应用(具体简介见下)。

今年3月起,我国华东地区陆续出现系列人流感样病例,被证实为首次人感染H7N9禽流感病毒。自此全球卫生官员一直密切关注着事态的进展。到7月止,共计发现了超过130例感染病例,其中约五分之一夺取了病患的生命。

此前大多数感染情况主要出现在与感染家禽直接接触感染的病例,研究也表明这种病毒在人传人的传播进程仍然属于低效的。但是科学家们也表示说,只要有一个突变,就有可能帮助病毒克服这一障碍,例如8月7日《英国医学杂志》发表一则研究报告称,最新研究发现H7N9禽流感有人与人之间传播的证据。世卫组织总干事陈冯富珍也表示,现时仍需保持警觉,有研究证实病毒在秋冬期间较为活跃,可能出现更多病例,强调世卫将会与内地紧密合作。

这些都强调出了找到禽流感遗传可变性以及进化历程的重要性,为此在最新这项研究中,研究人员针对新出现的H7N9病毒,以及另外一个病毒株,H9N2展开了研究,收集了来自人类,家禽和野生鸟类的共计87个分离样品,进行测序研究。

他们的研究结果表明,H7N9可能与其它亚型进行超过一次的融合——首先在野生鸟类中,然后再在家养鸟类发生重组。这些基因重组在流感病毒中很常见,这也是导致新菌种出现的原因之一。

文章作者蒋太交研究员表示,“深入了解新型H7N9病毒如何产生的,是制定合适监控措施,防控病毒,以及其它潜在禽流感病毒的关键所在”。

H7N9是一种在家禽中具有低致病性禽流感病毒,病毒表面糖蛋白hemagglutinin (HA)负责宿主受体结合,是病毒宿主“跳跃”的主要决定因素。近期的研究证实,禽流感H5N1病毒HA发生Q226L 置换赋予了其人类受体结合能力,同时大大减小了与禽类受体结合的能力。因此,观察到流感病毒的受体转换引起了人们对于人类流感大流行的担忧。值得注意的是,除了上海较早期的一种病毒分离株SH-H7N在226位点保留了谷氨酰胺,在大多数的分离病毒株,例如在安徽省发现的AH-H7N9中均观察到有天然存在的Q226L 置换。这些研究发现使得科学家们推测,AH-H7N9谱系病毒有可能获得了高亲和力人类受体结合特性。

此外,荷兰伊拉斯谟大学的研究人员也利用被最早报道的两个H7N9病毒株进行分析,并与流感病毒H3N2与H1N1,以及禽流感病毒H5N1与H7N7对比。结果发现,与其他禽流感病毒相似的是,H7N9病毒感染下呼吸道比感染上呼吸道更容易,不过不同之处在于,H7N9病毒在下呼吸道中黏附上皮细胞的数量要多得多,这一特点与H7N9病毒表现出的高致病性相一致。

这种感染模式在禽流感病毒中尚属首次发现。这说明H7N9病毒具有在人际间有效传播并导致严重肺炎从而引起大流行的潜在可能。

原文下载

Aiping Wu1,Chunhu Su,Dayan Wang,Yousong Peng,Mi Liu1,Sha Hua1,Tianxian Li,George F. Gao,Hong Tang,Jianzhu Chen,Xiufan Liu,Yuelong Shu,Daxin Peng, Sequential Reassortments Underlie Diverse Influenza H7N9 Genotypes in China.Cell Host & Microbe.2013 Sep 19

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    2013-11-03 维他命
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    2014-07-06 hongbochen
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    2013-10-22 xjy02
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