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MEGAclearTM Transcription Clean-Up Kit

Company: Thermo Fisher Scientific
Catalog#: AM1908
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Ectopic Gene Expression in Macrophages Using in vitro Transcribed mRNA
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Date:
2018-05-20
[Abstract]  Macrophages are immune cells that contribute to host defense through various mechanisms including phagocytosis and antigen presentation. Their antimicrobial capacity is subverted by clinically important intracellular pathogens such as Mycobacterium tuberculosis. The study of host-pathogen interactions using these cells is therefore of considerable interest. Such studies often seek to express tagged proteins to characterize their activities, localizations, and protein-protein interactions. Here, we describe a robust method for transient protein expression in macrophages using mRNA lipoplex transfections. [摘要]  巨噬细胞是通过包括吞噬作用和抗原呈递在内的多种机制促成宿主防御的免疫细胞。 它们的抗菌能力被临床上重要的细胞内病原体诸如结核分枝杆菌(Mycobacterium tuberculosis)所破坏。 因此使用这些细胞进行宿主 - 病原体相互作用的研究具有相当大的意义。 这样的研究通常试图表达标记的蛋白质来表征它们的活性,定位和蛋白质 - 蛋白质相互作用。 在这里,我们描述了使用mRNA脂质复合物转染在巨噬细胞中瞬时蛋白质表达的稳健方法。

【背景】典型的实现蛋白质表达的方法,包括使用阳离子聚合物转染DNA,核转染和病毒转导(Zhang等人,2009)在巨噬细胞中特别困难,因为这些细胞具有对 各种危险信号如胞质DNA。 因此,用于外源基因递送的常规方法导致差的转染效率和细胞死亡。 我们推论,正如最近的报道(Van De Parre等人,2004; McLenachan等人,2004)所述,转染mRNA而不是DNA,将是实现巨噬细胞中蛋白质表达的更好的替代方案 。,2013)。 我们能够实现高转染效率而不损失巨噬细胞活力(Koster等人,2017)。 我们的方法不需要昂贵的设备,可以适应表达外源性和内源性蛋白质。

A Protocol for Production of Mutant Mice Using Chemically Synthesized crRNA/tracrRNA with Cas9 Nickase and FokI-dCas9
Author:
Date:
2017-06-05
[Abstract]  The clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 (Cas9) system is the most widely used genome editing tool. A common CRISPR/Cas9 system consists of two components: a single-guide RNA (sgRNA) and Cas9. Both components are required for the introduction of a double-strand break (DSB) at a specific target sequence. One drawback of this system is that the production of sgRNA in the laboratory is laborious since it requires cloning of an sgRNA sequence, in vitro transcription reaction and sgRNA purification. An alternative to targeting Cas9 activity by sgRNA is to target it with two small RNAs: CRISPR RNA (crRNA) and trans-activating crRNA (tracrRNA). Both of these small RNAs can be chemically synthesized which makes the production of ... [摘要]  聚类规则间隔短回文重复(CRISPR)/ CRISPR相关蛋白9(Cas9)系统是使用最广泛的基因组编辑工具。一个常见的CRISPR / Cas9系统由两个组成部分组成:单导RNA(sgRNA)和Cas9。在特定靶序列引入双链断裂(DSB)需要两种成分。该系统的一个缺点是实验室中sgRNA的生产是费力的,因为它需要在体外​​转录反应和sgRNA纯化之间克隆sgRNA序列。通过sgRNA靶向Cas9活性的替代方案是用两种小RNA:CRISPR RNA(crRNA)和反式激活性crRNA(tracrRNA)进行靶向。这两种小RNA可以化学合成,这使得与sgRNA相比,这些RNA的产生不那么困难。 CRISPR / Cas9系统的另一个缺点是已经报告了脱靶效应。然而,已经开发了改进形式的Cas9以最小化离靶效应。例如,仅当两个引导RNA在规定的距离内结合相对的链时,切口酶型Cas9(nCas9)和FokI结构域融合的催化无活性的Cas9(FokI-dCas9; fCas9)才诱导DSB。在本协议中,我们描述了使用结合crRNA,tracrRNA和Cas9修饰形式的CRISPR / Cas9系统来生产突变小鼠的实验系统。该方法不仅有利于制备用于基因组编辑系统的试剂,而且可以降低脱靶效应的风险。

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