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OwlTM EasyCastTM B1A Mini Gel Electrophoresis Systems

Company: Thermo Fisher Scientific
Catalog#: OwlTM EasyCastTM B1A
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Dense sgRNA Library Construction Using a Molecular Chipper Approach
Author:
Date:
2017-06-20
[Abstract]  Genetic screens using single-guide-RNA (sgRNA) libraries and CRISPR technology have been powerful to identify genetic regulators for both coding and noncoding regions of the genome. Interrogating functional elements in noncoding regions requires sgRNA libraries that are densely covering, and ideally inexpensive, easy to implement and flexible for customization. We present a Molecular Chipper protocol for generating dense sgRNA libraries from genomic regions of interest. This approach utilizes a combination of random fragmentation and a Type III restriction enzyme to derive a dense coverage of sgRNA library from input DNA. [摘要]  使用单导向RNA(sgRNA)文库和CRISPR技术的遗传筛选功能强大可以识别基因组编码区和非编码区的遗传调控因子。 在非编码区域中询问功能元件需要密集覆盖的sgRNA文库,理想的便宜,易于实现和灵活定制。 我们提出了一个分子切片方案从感兴趣的基因组区域产生密集的sgRNA文库。 该方法利用随机断裂和III型限制酶的组合从输入DNA导出sgRNA文库的致密覆盖。
【背景】使用化脓性链球菌(sp)的基因组编辑Cas9和sgRNA文库是通过产生双重缺失功能序列改变来筛选哺乳动物细胞功能性遗传调节因子的有力工具(Wiedenheft et al。,2012; Mali et al。,2013; Koike-Yusa等,2014; Shalem等,2014; Wang等,2014; Zhou等,2014)。 Cas9结合sgRNA,其可被设计为将Cas9靶向基因组中定义的基因座。 Cas9的核酸酶活性切割靶DNA位点,导致双链DNA断裂,在通过非同源末端连接途径进行DNA修复时,经常导致感兴趣的基因座短缺失。
CRISPR-Cas9系统强大的基因组编辑能力导致使用sgRNA文库来询问蛋白质编码基因以及非编码区域。通过sgRNA富集功能筛选,报告了几种用于蛋白质编码基因和/或有限数量的非编码基因的sgRNA文库,以鉴定调控特定细胞功能的基因和网络(Koike-Yusa等,2014; ...

Differential Salt Fractionation of Nuclei to Analyze Chromatin-associated Proteins from Cultured Mammalian Cells
Author:
Date:
2017-03-20
[Abstract]  Nucleosomes are the core units of cellular chromatin and are comprised of 147 base pairs (bp) of DNA wrapped around an octamer of histone proteins. Proteins such as chromatin remodelers, transcription factors, and DNA repair proteins interact dynamically with chromatin to regulate access to DNA, control gene transcription, and maintain genome integrity. The extent of association with chromatin changes rapidly in response to stresses, such as immune activation, oxidative stress, or viral infection, resulting in downstream effects on chromatin conformation and transcription of target genes. To elucidate changes in the composition of proteins associated with chromatin under different conditions, we adapted existing protocols to isolate nuclei and fractionate cellular chromatin using a ... [摘要]  核小体是细胞染色质的核心单元,由包裹在组蛋白的八聚体周围的147个碱基对(bp)的DNA组成。蛋白质如染色质重组体,转录因子和DNA修复蛋白质与染色质动态相互作用以调控DNA的接触,控制基因转录和维持基因组完整性。与染色质结合的程度响应于诸如免疫激活,氧化应激或病毒感染等应激而迅速变化,导致对染色质构象和靶基因转录的下游作用。为了阐明在不同条件下与染色质相关蛋白质组成的变化,我们调整了现有的方案来分离核,并使用盐浓度的梯度分离细胞染色质。可以通过蛋白质印迹或质谱法评估不同盐部分中特定蛋白质的存在,从而了解与染色质相关的程度。

背景 由于与DNA或组蛋白的电荷相互作用,许多染色质相关蛋白在低盐条件下是不溶的。由于盐破坏了基于电荷的蛋白质DNA和蛋白质 - 蛋白质的相互作用,染色质相关蛋白质随着NaCl浓度的增加而变得更加可溶(Teves和Henikoff,2012)。与DNA强烈结合的蛋白质预期用高盐洗脱,而松散结合的蛋白质(例如转录因子)将用低盐洗脱。我们特别关心病毒感染如何改变与细胞染色质相关的因素的组成。核复制病毒,例如腺病毒,单纯疱疹病毒和爱泼斯坦 - 巴尔病毒,可以显着改变感染期间宿主染色质的出现(Avgousti等人,2016; Lam等人, ,2010; Simpson-Holley等人,2005; ...

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