Cell再发关闭CRISPR-Cas9新方法

2016-12-30 MEI bio360

12 月 8 日,在 Cell 发表的一项研究中,研究人员发现了CRISPR - Cas9活性的第一个已知的“关闭开关”。最近一个研究团队又发现了一种关闭CRISPR-Cas9的新方法,解决了CRISPR-Cas9基因编辑方法的潜在问题。团队利用噬菌体蛋白,允许更精确的基因编辑,并给予研究人员停用整个系统的可操作性。详情已经发表在12 月 29 日的 Cell 杂志上。CRISPR-Cas9 是科

12 月 8 日,在 Cell 发表的一项研究中,研究人员发现了CRISPR - Cas9活性的第一个已知的“关闭开关”。最近一个研究团队又发现了一种关闭CRISPR-Cas9的新方法,解决了CRISPR-Cas9基因编辑方法的潜在问题。团队利用噬菌体蛋白,允许更精确的基因编辑,并给予研究人员停用整个系统的可操作性。详情已经发表在12 月 29 日的 Cell 杂志上。

CRISPR-Cas9 是科学家用来编辑基因组的一种方法。 Cas9 是一种酶,它剪掉DNA片段,以便它们可以被替换。 CRISPR-Cas9 系统天然存在于细菌中,是一种对抗噬菌体,仅靶向细菌的病毒的方法。它能够切割和储存病毒DNA切片,以使细菌在将来能够识别噬菌体。 研究人员利用这一系统来修饰基因组和修复遗传疾病。 然而,CRISPR-Cas9 偶尔也会出错。 在过去,科学家没有办法停用该系统,导致未来人类试验的安全问题。

来自加州大学旧金山分校的研究人员研究了使CRISPR-Cas9 系统失活的可能方法。 CRISPR-Cas9 主要是细菌与病毒作斗争的方法,但团队观察到了被感染的细菌。 如果噬菌体感染细菌并插入其 DNA,Cas9 便会尝试将其切下,即使它将靶向细菌自己的基因组。 由于病毒需要有一个活的宿主,所以这将不利于病毒。 研究团队推测,一些噬菌体具有用于失活 Cas9 的抗 CRISPR 蛋白。 在筛选了以这种方式感染的细菌后,研究小组发现了两种抗CRISPR蛋白,称为AcrIIA2 和 AcrIIA4。 两种蛋白质都能够抑制 Cas9 酶。 AcrIIA2 和AcrIIA4 可用于失活 Cas9,关闭整个 CRISPR-Cas9 系统。

该团队的研究结果将使科学家更好地控制基因编辑。 如果CRISPR-Cas9系统开始犯错,研究人员可以停用它。 系统可以临时或永久关闭, 这将使该技术更安全地用于最终的人体试验。

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    2017-03-12 维他命
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    2017-01-01 yuandd
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    2017-01-01 respect
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    2017-01-01 yaanren
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    2016-12-30 明月清辉

    不明觉厉啊

    0

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为了利用CRISPR-Cas9基因编辑系统切割基因,人们必需设计一种与靶基因的DNA相匹配的RNA序列。大多数基因具有上百个这样的在基因组中的活性和独特性上存在差异的序列。因此,寻找最佳的序列很难通过手工实现。一种新的“CrispRGold”程序有助科学家们鉴定出最为高效的和最为特异性的RNA序列。这种程序是由德国马克斯-德尔布吕克分子医学中心科学家Klaus Rajewsky教授领导的一个研究团

盘点:生物谷推荐:5月必看的重磅级研究

5月转眼就快要过去了,这个月又有哪些研究值得我们深读一下呢?小编将根据本月新闻的点击量、研究领域、热度筛选出了5月份值得一看的突破性研究。 【1】Science Cell子刊:丁胜突破性成果!利用特殊药物将皮肤细胞成功转化为心脏和大脑细胞 doi:10.1126/science.aaf1502 近日,来自格莱斯顿研究所(Gladstone Institutes)的科学家们利用一种组合

Nature:重磅!首次利用CRISPR-Cas9对非分裂细胞进行基因编辑

在一项新的研究中,来自美国沙克研究所的研究人员发现基因编辑的圣杯---首次能够在基因组的靶位点上将DNA插入到非分裂细胞(non-dividing cell)中,其中非分裂细胞占成年器官和组织中的大多数。他们证实这种技术能够部分恢复失明的啮齿类动物的视觉反应。它将为基础研究和多种治疗视网膜疾病、心脏疾病和神经疾病等疾病的方法打开新的途径。相关研究结果于2016年11月16日在线发表