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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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在一项新的研究中,来自美国麻省理工学院(MIT)的研究人员设计出一种方法在人细胞的DNA中记录复杂的历史事件,从而允许他们通过对这种DNA进行测序从中找回过去事件的“记忆”。相关研究结果于2016年8月18日在线发表在Science期刊上,论文标题为“Continuous genetic recording with self-targeting CRISPR-Cas in hum

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

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