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Cell Rep:道高一尺,魔高一丈!HIV可以逃避CRISPR/Cas9治疗

2016-04-08 何嫱 生物通微信

当前CRISPR/Cas9已被成功改造成基因组定点编辑工具。因此,如何利用CRISPR/Cas9系统对HIV-1病毒基因进行高效靶向修饰,从而达到治疗HIV-1感染病患的目的成为了国内外许多实验室的研究热点。 HIV是一种有效和狡猾的逆转录病毒。一旦HIV将其DNA导入宿主细胞基因组,它就有一段很长的潜伏期,并能保持休眠状态潜伏很多年。虽然医生可以调制相匹配的抗逆转录病毒药物鸡尾酒,

当前CRISPR/Cas9已被成功改造成基因组定点编辑工具。因此,如何利用CRISPR/Cas9系统对HIV-1病毒基因进行高效靶向修饰,从而达到治疗HIV-1感染病患的目的成为了国内外许多实验室的研究热点。

HIV是一种有效和狡猾的逆转录病毒。一旦HIV将其DNA导入宿主细胞基因组,它就有一段很长的潜伏期,并能保持休眠状态潜伏很多年。虽然医生可以调制相匹配的抗逆转录病毒药物鸡尾酒,来抑制病毒,但是如果停止治疗病毒又会再度复活。为了使潜伏性HIV变得完全无害,美国麻省大学医学院的研究人员利用Cas9 / CRISPR——一种强大的基因编辑工具,开发出一种新型技术,有可能将潜在病毒的DNA从被感染细胞中去除。

Thumbnail image of Figure 1. Opens large image

然而,根据发表在4月7日《Cell Reports》杂志上的一项研究,在将CRISPR/Cas9用作有效的抗病毒药物之前,或许还需要对这一基因编辑平台进行稍微的调整。利用CRISPR/Cas9突变细胞DNA内HIV-1的研究人员发现,尽管单突变可以抑制病毒复制,一些也可以导致意外的抵抗。研究人员认为,靶向多个病毒DNA区域对于有效实现CRISPR/Cas9的潜在抗病毒能力或许是必要的。

一旦进入到细胞中,HIV的RNA基因组会转变为DNA,与细胞DNA缠绕在一起。由此可以编程CRISPR/Cas9来靶向一段DNA序列,切割病毒DNA。问题是,HIV极擅长携带新突变存活及旺盛生长,因此尽管许多的病毒被这种靶向方法所杀死,逃避CRISPR/Cas9治疗的HIV会变得更难靶向。

论文的资深作者、麦吉尔大学艾滋病中心副教授、犹太综合医院Lady Davis研究所的高级研究员梁晨(Chen Liang,音译)说:“当我们测序逃脱HIV的病毒RNA时,惊讶地发现病毒的大多数突变都恰好排列在Cas9切割DNA的位点,这直接表明了这些突变是修复断裂DNA时细胞非同源末端连接机器所介导,而非病毒逆转录酶的错误所致。”

“一些突变很小,只有单核苷酸,但这一突变改变了序列,使得Cas9不再能够识别它。这样的突变不会损伤病毒,因此这些抵抗病毒仍然可以复制。”

这项由麦吉尔大学、蒙特利尔大学、中国医学科学院和北京协和医学院的研究人员协作完成的研究,为希望将CRISPR/Cas9用作为一种抗病毒药物的人提供了一个警示故事。梁晨不认为这些努力是徒劳的,因为有一些策略可以克服这一限制。例如,利用CRISPR/Cas9或Cas9以外的其他酶来靶向多个位点。一旦确定了一种解决方案,下一个障碍将是找到一些方法向患者递送治疗物。

梁晨说:“不仅是HIV-1,CRISPR/Cas9为许多其他的病毒找到一种治愈方法带来了新希望。朝着这一目标,我们还有一条漫长的路要走,有许多的障碍和限制需要我们去克服,但我们有信息将会获得成功。”

原始出处:

Zhen Wang, Qinghua Pan, Patrick Gendron, Weijun Zhu, Fei Guo, Shan Cen, Mark A. Wainberg, Chen Liang.CRISPR/Cas9-Derived Mutations Both Inhibit HIV-1 Replication and Accelerate Viral Escapehttp://dx.doi.org/10.1016/j.celrep.2016.03.042 

PDF (2 MB)

Zhu W, Lei R, Le Duff Y, Li J, Guo F, Wainberg MA, Liang C. The CRISPR/Cas9 system inactivates latent HIV-1 proviral DNA. Retrovirology. 2015 Feb 27;12:22.

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    2016-08-24 维他命
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2016, time=2016-04-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1341229, encodeId=56c31341229e9, content=<a href='/topic/show?id=e9c45226b3' target=_blank style='color:#2F92EE;'>#CRISPR/Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=51, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5226, encryptionId=e9c45226b3, topicName=CRISPR/Cas9)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=7eeb2500172, createdName=haouestc, createdTime=Sun Apr 10 06:36:00 CST 2016, time=2016-04-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1365001, encodeId=e50913650013f, content=<a href='/topic/show?id=3f66412ebd' target=_blank style='color:#2F92EE;'>#Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4127, encryptionId=3f66412ebd, topicName=Cas9)], attachment=null, 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createdAvatar=http://api.medsci.cn/resource/upload/20150519/IMG555B5CBF061469051.jpg, createdBy=af1f1622088, createdName=wssgxyj, createdTime=Fri Apr 08 20:24:00 CST 2016, time=2016-04-08, status=1, ipAttribution=)]
    2016-04-14 李继凯

    文章值得

    0

  5. 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2016, time=2016-04-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1341229, encodeId=56c31341229e9, content=<a href='/topic/show?id=e9c45226b3' target=_blank style='color:#2F92EE;'>#CRISPR/Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=51, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5226, encryptionId=e9c45226b3, topicName=CRISPR/Cas9)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=7eeb2500172, createdName=haouestc, createdTime=Sun Apr 10 06:36:00 CST 2016, time=2016-04-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1365001, encodeId=e50913650013f, content=<a href='/topic/show?id=3f66412ebd' target=_blank style='color:#2F92EE;'>#Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4127, encryptionId=3f66412ebd, topicName=Cas9)], attachment=null, 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createdAvatar=http://api.medsci.cn/resource/upload/20150519/IMG555B5CBF061469051.jpg, createdBy=af1f1622088, createdName=wssgxyj, createdTime=Fri Apr 08 20:24:00 CST 2016, time=2016-04-08, status=1, ipAttribution=)]
    2016-04-14 李继凯

    不错,好好学习

    0

  6. 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2016, time=2016-04-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1341229, encodeId=56c31341229e9, content=<a href='/topic/show?id=e9c45226b3' target=_blank style='color:#2F92EE;'>#CRISPR/Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=51, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5226, encryptionId=e9c45226b3, topicName=CRISPR/Cas9)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=7eeb2500172, createdName=haouestc, createdTime=Sun Apr 10 06:36:00 CST 2016, time=2016-04-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1365001, encodeId=e50913650013f, content=<a href='/topic/show?id=3f66412ebd' target=_blank style='color:#2F92EE;'>#Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4127, encryptionId=3f66412ebd, topicName=Cas9)], attachment=null, 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createdAvatar=http://api.medsci.cn/resource/upload/20150519/IMG555B5CBF061469051.jpg, createdBy=af1f1622088, createdName=wssgxyj, createdTime=Fri Apr 08 20:24:00 CST 2016, time=2016-04-08, status=1, ipAttribution=)]
    2016-04-10 yuandd
  7. 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2016, time=2016-04-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1341229, encodeId=56c31341229e9, content=<a href='/topic/show?id=e9c45226b3' target=_blank style='color:#2F92EE;'>#CRISPR/Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=51, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5226, encryptionId=e9c45226b3, topicName=CRISPR/Cas9)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=7eeb2500172, createdName=haouestc, createdTime=Sun Apr 10 06:36:00 CST 2016, time=2016-04-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1365001, encodeId=e50913650013f, content=<a href='/topic/show?id=3f66412ebd' target=_blank style='color:#2F92EE;'>#Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=57, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4127, encryptionId=3f66412ebd, topicName=Cas9)], attachment=null, 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  8. 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    2016-04-10 respect
  9. 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    2016-04-10 yaanren
  10. 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    2016-04-08 wssgxyj

    真刺激!

    0

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