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Plant Cell Physiol:新方法让CRISPR/Cas9高效地敲除拟南芥中的靶基因

2016-12-11 佚名 生物谷

在一项新的研究中,来自日本名古屋大学转化生物分子研究所的两名生物学家Hiroki Tsutsui和Tetsuya Higashiyama开发出一种新的载体(一种转运遗传信息的载体),从而允许高效地和可遗传地敲除模式植物拟南芥中的靶基因。相关研究结果近期发表在Plant and Cell Physiology期刊上,论文标题为“pKAMA-ITACHI vectors for highly effi



在一项新的研究中,来自日本名古屋大学转化生物分子研究所的两名生物学家Hiroki Tsutsui和Tetsuya Higashiyama开发出一种新的载体(一种转运遗传信息的载体),从而允许高效地和可遗传地敲除模式植物拟南芥中的靶基因。相关研究结果近期发表在Plant and Cell Physiology期刊上,论文标题为“pKAMA-ITACHI vectors for highly efficient CRISPR/Cas9-mediated gene knockout in Arabidopsis thaliana”。

基因组工程涉及对宿主基因组的一部分进行特异性修饰,即移除、添加和改变宿主基因组中的DNA序列片段。迄今为止,CRISPR/Cas9系统因其简易性、多功能性和高效性而成为一种最为流行的基因操纵方法之一。

然而,对拟南芥而言,CRISPR/Cas9的突变诱导效率在某种程度上一直都比较低。这是因为诱导基因突变的Cas9是在细胞的发育阶段后期被激活的。因此,为了获得所需的靶基因被敲除的植物物种,人们就需要大量的时间、精力和植物物种。

CRISPR/Cas9系统由两个关键的分子组成:一种被称作向导RNA(gRNA)的RNA片段和一种被称作Cas9的核酸酶。Cas9是一种分子剪刀,能够在基因组特定位点上切割DNA的双链,这样就能够在该位点上添加或移除DNA序列。另一方面,gRNA是一种事先设计好的位于一种更长的RNA骨架内的RNA片段(大约长20个碱基)。这种RNA骨架结合到DNA上,这样这种事先设计好的RNA序列引导Cas9到基因组的特定部分,因此Cas9就能够在靶位点上进行切割。

Tsutsui说,“通过使用RPS5A基因---在植物细胞的胚胎发育初期表达---的启动子,我们能够诱导Cas9高效地敲除植物卵细胞中的基因。这个RPS5A启动子在卵细胞中是有活性的,因此我们决定将这个分子工具称为pKAMA-ITACHI Red(pKIR)载体。相对于在植物中经常使用的35S启动子,该分子工具能够高效地编辑植物基因组。”

Higashiyama说,“通过能够高效地敲除拟南芥中的靶基因,我们将这种工具视为一种阐明植物基因功能的有前途的方法。我们希望我们能够利用这种方法进行欧洲油菜等作物基因组编辑,从而加快它们的生长和培育出多种植物品种。”

这种CRISPR/Cas9系统通过敲除一种特定的基因来研究它的功能。在拟南芥中,由于Cas9是在细胞的发育阶段后期表达的,因此基因敲除的程度依据组织的不同而存在差异。因此,这种基因组突变效率相对较低。

比如,当利用植物中一种经常使用的35S启动子在拟南芥中表达Cas9时,尽管在叶子中观察到大量的基因敲除,但是在花朵中仅检测到少量基因敲除。这提示着靶基因的敲除突变效率在花朵的生殖细胞中相对较低。因此,这种敲除突变很难传递到下一代的子细胞中。

为了解决这个问题,Higashiyama团队决定在植物卵细胞和胚胎发育早期期间的细胞中表达Cas9以便提高靶基因敲除效率。

Higashiyama团队首先试图敲除PDS3基因,其中已知该基因负责合成植物中的叶绿素。若缺乏叶绿素,植物变成一种白化物种。通过利用pKIR表达Cas9,Tsutsui成功地观察到PDS3基因被敲除,这可通过产生一种白化植物加以证明。

Tsutsui也研究了当PDS3基因被敲除时,它对叶绿素在花茎中的合成数量的影响。当利用35S启动子表达Cas9时,叶绿素数量与野生型中观察到的数量仅有微量的差别。另一方面,当利用pKIR诱导Cas9表达时,叶绿素数量显著下降,这提示着该基因被高效地敲除。

Higashiyama团队也发现pKIR载体成功地敲除拟南芥中的其他基因,如AGAMOUS、DUO1和ADH1。

为了容易地鉴定出携带CRISPR/Cas9基因的植物物种,含有Cas9的种子利用红色荧光加以标记。

Higashiyama团队发现利用pKIR载体表达Cas9对拟南芥基因组进行高效编辑的方法能够敲除早期发育阶段期间的细胞中的基因,并且诱导能够传递到下一代的子细胞中的突变。

Tsutsui说,“这种pKIR方法允许我们研究可能具有重叠功能的基因簇。在此之前,我们不得不通过让现存的突变株进行杂交产生多种基因敲除植物来研究重叠的基因功能,这非常耗费时间。利用我们的相对低成本的方法,我们能够快速地获得突变株,从而应当能够研究未被鉴定出的基因簇的功能。”

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likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5211, encryptionId=755d5211a0, topicName=CRISPR)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=583c133, createdName=yuandd, createdTime=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1313177, encodeId=05e713131e78c, content=<a href='/topic/show?id=64dd9996046' target=_blank style='color:#2F92EE;'>#靶基因#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=100, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=99960, encryptionId=64dd9996046, topicName=靶基因)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=69cb413, createdName=chengjn, createdTime=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1341246, encodeId=2bc0134124618, content=<a href='/topic/show?id=e9c45226b3' target=_blank style='color:#2F92EE;'>#CRISPR/Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, 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=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=)]
  4. [GetPortalCommentsPageByObjectIdResponse(id=1903169, encodeId=23a51903169d8, content=<a href='/topic/show?id=e1b0583884b' target=_blank style='color:#2F92EE;'>#新方法#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=63, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=58388, encryptionId=e1b0583884b, topicName=新方法)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c22f171, createdName=kord1982, createdTime=Sun Aug 13 07:58:00 CST 2017, time=2017-08-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1869675, encodeId=a32b18696e548, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=49, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, createdName=zhaozhouchifen, createdTime=Fri Nov 10 05:58:00 CST 2017, time=2017-11-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1788792, encodeId=97601e88792b8, content=<a href='/topic/show?id=866d1421e4c' target=_blank style='color:#2F92EE;'>#Physio#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=63, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=14217, encryptionId=866d1421e4c, topicName=Physio)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c689267, createdName=cmj8wellington, createdTime=Tue Oct 31 08:58:00 CST 2017, time=2017-10-31, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1959934, encodeId=55251959934d2, content=<a href='/topic/show?id=dbe6445416' target=_blank style='color:#2F92EE;'>#CEL#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=59, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4454, encryptionId=dbe6445416, topicName=CEL)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3ff68, createdName=维他命, createdTime=Fri Dec 30 00:58:00 CST 2016, time=2016-12-30, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1789137, encodeId=ecb51e8913705, content=<a href='/topic/show?id=0c8814344f5' target=_blank style='color:#2F92EE;'>#plant#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=14344, encryptionId=0c8814344f5, topicName=plant)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=8f5b299, createdName=xuyu, createdTime=Sat Jul 15 08:58:00 CST 2017, time=2017-07-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1950120, encodeId=08a119501200c, content=<a href='/topic/show?id=f98b15504d8' target=_blank style='color:#2F92EE;'>#RISPR/Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=72, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=15504, encryptionId=f98b15504d8, topicName=RISPR/Cas9)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=e1cc90, createdName=rebeccajiejie, createdTime=Wed Jun 14 11:58:00 CST 2017, time=2017-06-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=162393, encodeId=13b016239371, content=做的不错, beContent=null, objectType=article, channel=null, level=null, likeNumber=94, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=19061994286, createdName=1e1b1150m51(暂无匿称), createdTime=Tue Dec 13 09:18:02 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1275963, encodeId=80d212e596323, content=<a href='/topic/show?id=755d5211a0' target=_blank style='color:#2F92EE;'>#CRISPR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5211, encryptionId=755d5211a0, topicName=CRISPR)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=583c133, createdName=yuandd, createdTime=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1313177, encodeId=05e713131e78c, content=<a href='/topic/show?id=64dd9996046' target=_blank style='color:#2F92EE;'>#靶基因#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=100, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=99960, encryptionId=64dd9996046, topicName=靶基因)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=69cb413, createdName=chengjn, createdTime=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1341246, encodeId=2bc0134124618, content=<a href='/topic/show?id=e9c45226b3' target=_blank style='color:#2F92EE;'>#CRISPR/Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, 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=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=)]
    2016-12-30 维他命
  5. [GetPortalCommentsPageByObjectIdResponse(id=1903169, encodeId=23a51903169d8, content=<a href='/topic/show?id=e1b0583884b' target=_blank style='color:#2F92EE;'>#新方法#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=63, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=58388, encryptionId=e1b0583884b, topicName=新方法)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c22f171, createdName=kord1982, createdTime=Sun Aug 13 07:58:00 CST 2017, time=2017-08-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1869675, encodeId=a32b18696e548, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=49, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, 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level=null, likeNumber=72, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=15504, encryptionId=f98b15504d8, topicName=RISPR/Cas9)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=e1cc90, createdName=rebeccajiejie, createdTime=Wed Jun 14 11:58:00 CST 2017, time=2017-06-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=162393, encodeId=13b016239371, content=做的不错, beContent=null, objectType=article, channel=null, level=null, likeNumber=94, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=19061994286, createdName=1e1b1150m51(暂无匿称), createdTime=Tue Dec 13 09:18:02 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1275963, encodeId=80d212e596323, content=<a href='/topic/show?id=755d5211a0' target=_blank style='color:#2F92EE;'>#CRISPR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5211, encryptionId=755d5211a0, topicName=CRISPR)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=583c133, createdName=yuandd, createdTime=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1313177, encodeId=05e713131e78c, content=<a href='/topic/show?id=64dd9996046' target=_blank style='color:#2F92EE;'>#靶基因#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=100, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=99960, encryptionId=64dd9996046, topicName=靶基因)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=69cb413, createdName=chengjn, createdTime=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1341246, encodeId=2bc0134124618, content=<a href='/topic/show?id=e9c45226b3' target=_blank style='color:#2F92EE;'>#CRISPR/Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, 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=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=)]
    2017-07-15 xuyu
  6. [GetPortalCommentsPageByObjectIdResponse(id=1903169, encodeId=23a51903169d8, content=<a href='/topic/show?id=e1b0583884b' target=_blank style='color:#2F92EE;'>#新方法#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=63, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=58388, encryptionId=e1b0583884b, topicName=新方法)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c22f171, createdName=kord1982, createdTime=Sun Aug 13 07:58:00 CST 2017, time=2017-08-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1869675, encodeId=a32b18696e548, content=<a href='/topic/show?id=fd764459a8' target=_blank style='color:#2F92EE;'>#Cell#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=49, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4459, encryptionId=fd764459a8, topicName=Cell)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=524d95, 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level=null, likeNumber=72, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=15504, encryptionId=f98b15504d8, topicName=RISPR/Cas9)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=e1cc90, createdName=rebeccajiejie, createdTime=Wed Jun 14 11:58:00 CST 2017, time=2017-06-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=162393, encodeId=13b016239371, content=做的不错, beContent=null, objectType=article, channel=null, level=null, likeNumber=94, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=19061994286, createdName=1e1b1150m51(暂无匿称), createdTime=Tue Dec 13 09:18:02 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1275963, encodeId=80d212e596323, content=<a href='/topic/show?id=755d5211a0' target=_blank style='color:#2F92EE;'>#CRISPR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5211, encryptionId=755d5211a0, topicName=CRISPR)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=583c133, createdName=yuandd, createdTime=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1313177, encodeId=05e713131e78c, content=<a href='/topic/show?id=64dd9996046' target=_blank style='color:#2F92EE;'>#靶基因#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=100, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=99960, encryptionId=64dd9996046, topicName=靶基因)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=69cb413, createdName=chengjn, createdTime=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1341246, encodeId=2bc0134124618, content=<a href='/topic/show?id=e9c45226b3' target=_blank style='color:#2F92EE;'>#CRISPR/Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, 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=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=)]
  7. 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style='color:#2F92EE;'>#CRISPR/Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, 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=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=)]
    2016-12-13 1e1b1150m51(暂无匿称)

    做的不错

    0

  8. 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style='color:#2F92EE;'>#CRISPR/Cas9#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, 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=Tue Dec 13 07:58:00 CST 2016, time=2016-12-13, status=1, ipAttribution=)]
    2016-12-13 yuandd
  9. 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  10. 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在一项新的研究中,来自美国冷泉港实验室(CSHL)的一个研究团队利用一种简单而又强大的调整两种流行的番茄植物品种中的基因的CRISPR/Cas9基因组编辑方法,开发出一种快速的方法使得它们比当前的商业品种早两个星期开花和结出成熟的果实。相关研究结果于2016年12月5日在线发表在Nature Genetics期刊上,论文标题为“Variation in the flowering gene SEL

Cell:首次利用CRISPR/Cas9系统鉴定出寄生虫必需基因

在一项新的研究中,来自美国怀特海德研究所的研究人员在顶复门(Apicomplexa)---导致疟疾、巴贝西虫病、隐孢子虫病和弓形虫病的单细胞寄生虫门---中进行首次全基因组筛选。这一筛选有助认识大量的未被研究过的寄生虫基因组,并且揭示为所有顶复门寄生虫所共有的一种蛋白。相关研究结果于2016年9月1日在线发表在Cell期刊上,论文标题为“A Genome-wide CRISPR Screen

PLoS Pathog:利用CRISPR/Cas9有望靶向清除多种疱疹病毒感染

大多数成年人携带着多种疱疹病毒。在初始的急性感染后,这些病毒在它们的宿主体内建立终生感染,并导致唇疱疹、角膜炎、生殖器疱疹、带状疱疹、传染性单核细胞增多症和其他疾病。一些疱疹病毒还能够导致人们患上癌症。在潜伏性感染阶段,这些病毒长时间地保持潜伏状态,但是保持偶尔重新激活的能力。这种重新激活有可能导致人们患病。一项新的研究提示着利用CRISPR/Cas9基因组编辑技术攻击疱疹病毒DNA能够抑制病

JNCI:重磅!科学家利用CRISPR/Cas9技术使癌症突变失活

由于在许多生物医学和生物技术领域均有着广泛的应用,“基因魔剪”CRISPR/Cas9或将完全打开癌症研究领域的大门;日前一项刊登在国际杂志Journal of the National Cancer Institute上的研究报告中,来自德国德累斯顿工业大学 (Dresden University of Technology)等机构的研究人员通过研究发现,扮演癌症驱动子的突变或许能够被靶向作用并且

Science:利用改进的CRISPR/Cas9系统高效和特异性地实现单碱基突变

 在一项新的研究中,利用一种引入DNA单个核苷酸变化的脱氨酶,来自日本神户大学的研究人员构建出一种改进的CRISPR/Cas9工具,从而避免产生有害的双链断裂,使得利用CRISPR/Cas9技术引入的附带突变最小化,而且也不需要加入DNA模板。相关研究结果于2016年8月4日在线发表在Science期刊上,论文标题为“Targeted nucleotide editing using

利用CRISPR/Cas9系统治疗HBV感染取得突破性进展

乙型肝炎病毒(HBV),简称乙肝病毒,是一种DNA病毒,属于嗜肝DNA病毒科(Hepadnavividae),可导致肝硬化和肝癌的发生,给全球带来严重的疾病负担。据世界卫生组织(WHO)报道,全球有20多亿人曾受到过乙型肝炎病毒(HBV)感染,大约3.5亿至4亿人罹患慢性乙肝病毒(HBV)感染,在亚洲和非洲发病率尤其高。我国的乙肝病毒感染率约60%-70%;乙肝表面抗原携带率约占总人口的7.1

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