| Dual sgRNA-based Targeted Deletion of Large Genomic Regions and Isolation of Heritable Cas9-free Mutants in Arabidopsis
|
|
Author:
Date:
2020-10-20
[Abstract] CRISPR/Cas9 system directed by a gene-specific single guide RNA (sgRNA) is an effective tool for genome editing such as deletions of few bases in coding genes. However, targeted deletion of larger regions generate loss-of-function alleles that offer a straightforward starting point for functional dissections of genomic loci. We present an easy-to-use strategy including a fast cloning dual-sgRNA vector linked to efficient isolation of heritable Cas9-free genomic deletions to rapidly and cost-effectively generate a targeted heritable genome deletion. This step-by-step protocol includes gRNA design, cloning strategy and mutation detection for Arabidopsis and may be adapted for other plant species.
[摘要] [摘要] CRISPR/Cas9由基因特异性单导RNA（sgRNA）引导的系统是一种有效的基因组编辑工具，如编码基因中少部分碱基的删除。然而，大区域的靶向缺失产生功能缺失等位基因，这为基因组基因座的功能解剖提供了一个直接的起点。我们提出了一个简单易用的策略，包括一个快速克隆双sgRNA载体，有效分离可遗传的Cas9游离基因组缺失，以快速且经济有效地产生靶向遗传基因组缺失。该方法包括拟南芥的gRNA设计、克隆策略和突变检测，可适用于其他植物。
[背景] ...
|
|
|
| TetR Regulated in vivo Repression Technology to Identify Conditional Gene Silencing in Genetically Engineerable Bacteria Using Vibrio cholerae Murine Infections as Model System
|
|
Author:
Date:
2020-10-05
[Abstract] Investigation of bacterial gene regulation upon environmental changes is still a challenging task. For example, Vibrio cholerae, a pathogen of the human gastrointestinal tract, faces diverse transient conditions in different compartments upon oral ingestion. Genetic reporter systems have been demonstrated to be extremely powerful tools to unravel gene regulation events in complex conditions, but so far focused mainly on gene induction. Herein, we describe the TetR-controlled recombination-based in vivo expression technology TRIVET, which allows detection of gene silencing events. TRIVET resembles a modified variant of the in vivo expression technology (IVET) as well as recombination-based in vivo expression technology (RIVET), which were used to ...
[摘要] [摘要]研究细菌基因对环境变化的调控仍然是一项艰巨的任务。例如，人胃肠道的病原体霍乱弧菌在口服后会在不同的隔室中遇到各种短暂的状况。事实证明，遗传报告系统是揭示复杂条件下基因调控事件的极有力工具，但到目前为止，它主要集中在基因诱导上。在本文中，我们描述了基于TetR控制的重组的体内表达技术TRIVET，该技术可检测基因沉默事件。TRIVET类似于体内表达技术（IVET）以及基于重组的体内变异体 表达技术（RIVET），用于鉴定宿主定殖过程中几种细菌的条件基因诱导。像它的前辈一样，TRIVET是一个基于单细胞的报告系统，可以通过耐药谱的表型变化以时空方式分析细菌基因的阻遏。简而言之，无启动子的tetR （编码转录阻遏物TetR）可通过转座子诱变随机地整合到细菌基因组中，或通过同源重组在目标启动子的下游特异性整合到细菌基因组中。的TetR导致的去阻遏的转录表达的减少的TetR控制解离TNPR，这反过来又导致切除ö F A Ñ抗生素抗性盒（也称为RES-盒）和改变的电阻曲线可观察到的通过划线上氨苄青霉素和卡那霉素板。然后可以将这种改变量化为抗性和非抗性分离株之间的比例。此外，新引入的第二报道基因，promot erless ...
|
|
|
| Assembly of Genetic Circuits with the Mammalian ToolKit
|
|
Author:
Date:
2020-03-05
[Abstract] The ability to rapidly assemble and prototype cellular circuits is vital for biological research and its applications in biotechnology and medicine. The Mammalian ToolKit (MTK) is a Golden Gate-based cloning toolkit for fast, reproducible and versatile assembly of large DNA vectors and their implementation in mammalian models. The MTK consists of a curated library of characterized, modular parts that can be assembled into transcriptional units and further weaved into complex circuits. These circuits are easily repurposed and introduced in mammalian cells by different methods.
[摘要] [摘要 ] 快速组装和原型细胞电路的能力对于生物学研究及其在生物技术和医学中的应用至关重要。哺乳动物工具箱（MTK）是基于金门大桥的克隆工具箱，用于快速，可复制和通用的大型DNA载体组装及其在哺乳动物模型中的实现。MTK由精选的，模块化的零件组成的精选库组成，这些零件可以组装成转录单位，并进一步编织成复杂的电路。这些电路很容易重新利用，并通过不同的方法引入哺乳动物细胞。
[背景 ] 分子克隆是现代生物技术与重新利用重组DNA导入多种基因电路可以表示目的的频谱的能力的标志。但是，探索遗传电路构建中可能存在的排列的主要局限性在于能否对电路设计进行快速原型设计，测试和实施改进。为了实现这一目标，需要从常规的克隆方法（如Gibson克隆（Akama-Garren 等人，2016）或限制性酶切消化）中加快从设计遗传回路到将其递送至细胞的时间。我们设计了一个框架，在该框架中，传统的基因电路被分解成其组成部分，以便人们可以轻松地交换这些组成部分，以快速组装出巨大的组合，从而评估每次迭代如何影响功能。受早期克隆工具包迭代的启发（Weber 等人，2011 a和2011b ; Duportet 等人，2014; Lee 等人，2015; Martella 等人，2017;Pérez-González 等人，2017; Halleran 等人，2017）等人，2018年; ...
|
|
|