| Screening Method for CRISPR/Cas9 Inhibition of a Human DNA Virus: Herpes Simplex Virus
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Author:
Date:
2020-09-05
[Abstract] The efficiency of cleavage of individual CRISPR/Cas9-sgRNAs remains difficult to predict based on the CRISPR target sequence alone. Different intracellular environments (dependent on cell type or cell cycle state for example) may affect sgRNA efficiency by altering accessibility of genomic DNA through DNA modifications such as epigenetic marks and DNA-binding proteins (e.g., histones) as well as alteration of the chromatin state of genomic DNA within the nucleus.
We recently reported a multi-step screening method for the identification of efficient sgRNAs targeting the Herpes simplex virus (HSV-1) genome and reported a differential mechanism for viral inhibition by CRISPR-Cas9 in the latent versus lytic phase. The screening platform detailed in this protocol allows ...
[摘要] [摘要 ] 单独基于CRISPR靶序列仍难以预测单个CRISPR / Cas9-sgRNA的切割效率。不同的细胞内环境（例如，取决于细胞类型或细胞周期状态）可能会通过DNA修饰（例如表观遗传标记和DNA结合蛋白（例如组蛋白））和染色质状态的改变来改变基因组DNA的可及性，从而影响sgRNA效率。核内基因组DNA的标记。
我们recen TLY 报道的多步骤方法筛选用于有效sgRNAs靶向的识别的单纯疱疹病毒（HSV-1）的基因组，并报告为在潜对裂解病毒相抑制CRISPR-Cas9的差动机构。该协议中详述的筛选平台允许在无细胞系统中以及在病毒靶细胞（例如人包皮成纤维细胞）的背景下逐步测试切割效率，然后对CRISPR / sgRNA的作用进行功能测试病毒蛋白的表达，复制，和再活化。该策略可以容易地应用于其他靶细胞，例如多能干细胞衍生的人感觉神经元或其他人DNA病毒。
背景 ] 单纯疱疹病毒（HSV）是的一种嗜神经性DNA病毒疱疹病毒科家族引起终身和无法治愈感染在大多数人群的，并可能导致显著发病率和死亡率（Liesegang环等人，1989; Roizman 等人。，2013） ...
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| A Method to Convert mRNA into a Guide RNA (gRNA) Library without Requiring Previous Bioinformatics Knowledge of the Organism
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Author:
Date:
2017-05-20
[Abstract] While the diversity of species represents a diversity of special biological abilities, many of the genes that encode those special abilities in a variety of species are untouched, leaving an untapped gold mine of genetic information; however, despite current advances in genome bioinformatics, annotation of that genetic information is incomplete in most species, except for well-established model organisms, such as human, mouse, or yeast. A guide RNA (gRNA) library using the clustered regularly interspersed palindromic repeats (CRISPR)/Cas9 (CRISPR-associated protein 9) system can be used for the phenotypic screening of uncharacterized genes by forward genetics. The construction of a gRNA library usually requires an abundance of chemically synthesized oligos designed from annotated genes; ...
[摘要] 虽然物种的多样性代表着特殊的生物学能力的多样性，但许多编码这些特殊能力的基因却是不变的，留下了未开发的遗传信息金矿;然而，尽管基因组生物信息学方面取得了进展，但除了成熟的模型生物体，如人，小鼠或酵母，遗传信息的注释在大多数物种中是不完全的。使用聚簇常规散布的回文重复序列（CRISPR）/ Cas9（CRISPR相关蛋白9）系统的引导RNA（gRNA）文库可用于通过正向遗传学对非特异性基因的表型筛选。 gRNA文库的构建通常需要从注释基因设计的大量化学合成寡核苷酸;如果想在没有目标DNA序列的先验知识的情况下将mRNA转换成gRNA，那么主要的挑战就是发现原始邻近基序（PAM）侧翼的序列并切出20-bp片段。最近，我开发了基于分子生物学技术将mRNA转化为gRNA文库（Arakawa，2016）（图1）。我在这里描述了如何从mRNA构建gRNA文库的详细协议。
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图1.将mRNA转化为gRNA文库构建的方法（Sanjana等人，2014）。总结了该方法的方案。在步骤中详细描述了D-O的每个步骤。 ...
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