庄小威PNAS发表研究新成果:新方法助力单细胞RNA分析

2016-11-26 叶予 生物通

本文转载自生物通,原标题“著名学者庄小威发表研究新成果 新方法助力单细胞RNA分析”。系统性分析单细胞的RNA丰度和空间定位,有助于我们理解细胞和发育生物学的许多方面。单分子荧光原位杂交(smFISH)是在单细胞中研究RNA拷贝数和空间定位的有力武器。去年四月,哈佛大学著名学者庄小威(Xiaowei Zhuang)教授在Science杂志发布了高度多重化的smFISH成像技术——MERFISH。这

本文转载自生物通,原标题“著名学者庄小威发表研究新成果 新方法助力单细胞RNA分析”。

系统性分析单细胞的RNA丰度和空间定位,有助于我们理解细胞和发育生物学的许多方面。单分子荧光原位杂交(smFISH)是在单细胞中研究RNA拷贝数和空间定位的有力武器。去年四月,哈佛大学著名学者庄小威(Xiaowei Zhuang)教授在Science杂志发布了高度多重化的smFISH成像技术——MERFISH。这种突破性技术能在单细胞水平上实现空间分辨的高度多重化RNA分析。

现在,庄小威团队找到了提高MERFISH性能的好办法。他们在美国国家科学院院刊PNAS杂志上发表文章,详细介绍了一种特殊的样本处理方法。文章指出,高度多重化的单分子FISH可以在单细胞中实现空间分辨的基因表达图谱分析。然而,FISH探针脱靶结合和细胞自体荧光带来的背景,限制了该技术的一些重要应用,特别是在多重化程度更高、成像短RNA和组织样本的时候。

为此,研究人员开发了一种清理样本的方法。首先他们鉴定了FISH探针与细胞组分的脱靶结合,这是FISH背景的一个主要来源。为了去除这种背景,研究人员将样本嵌入聚丙烯酰胺,把RNA锚定在聚丙烯酰胺基质中,随后清除细胞的蛋白和脂质。这些蛋白和脂质也是细胞自体荧光的来源。

研究人员在清理过的样本中通过MERFISH检测了130个RNA的拷贝数。研究显示,样本清理使探针脱靶结合和细胞自体荧光的背景显著减少,但没有造成明显的RNA损失。这种处理不仅改善了MERFISH的检测效率和检测极限,还允许MERFISH拓展到四色通道,让检测通量大大提升。研究人员还用这种方法对小鼠脑部的复杂组织样本进行了MERFISH分析。


原始出处

Jeffrey R. Moffitta,b,1, Junjie Haoa,b,1, Dhananjay Bambah-Mukkua,c, Tian Lua,b, Catherine Dulaca,c, and Xiaowei Zhuanga,b,d,2.High-performance multiplexed fluorescence in situ hybridization in culture and tissue with matrix imprinting and clearing.PNAS.2016

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    2017-06-12 wgx306
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    2017-05-28 drwjr
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    2016-11-26 明月清辉

    厉害了我的姐

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