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Autoclaves - Prestige Medical - Classic 126 Extendable

Company: Prestige Medical
Catalog#: 210004
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Genome Editing in Diatoms Using CRISPR-Cas to Induce Precise Bi-allelic Deletions
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2017-12-05
[Abstract]  Genome editing in diatoms has recently been established for the model species Phaeodactylum tricornutum and Thalassiosira pseudonana. The present protocol, although developed for T. pseudonana, can be modified to edit any diatom genome as we utilize the flexible, modular Golden Gate cloning system. The main steps include how to design a construct using Golden Gate cloning for targeting two sites, allowing a precise deletion to be introduced into the target gene. The transformation protocol is explained, as are the methods for screening using band shift assay and/or restriction site loss. [摘要]  最近为三角褐指藻(Phaeodactylum tricornutum)和海绵假丝酵母(Thalassiosira pseudonana)建立了硅藻基因组编辑。 目前的协议,虽然开发的 T。 pseudonana ,可以修改编辑任何硅藻基因组,因为我们利用灵活,模块化的金门克隆系统。 主要步骤包括如何设计构建使用金门克隆靶向两个网站,允许一个精确的删除被引入目标基因。 解释转化方案,以及使用带移位测定和/或限制性位点丢失进行筛选的方法。

【背景】CRISPR-Cas正在迅速成为分子研究的一个关键方法。基于在细菌和古细菌中发现的病毒防御机制,CRISPR-Cas诱导基因组中精确位置的双链断裂(DSBs)。它涉及使用与CRISPR ...

Evaluation of Plasmid Stability by Negative Selection in Gram-negative Bacteria
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Date:
2017-05-05
[Abstract]  Plasmid stability can be measured using antibiotic-resistance plasmid derivatives by positive selection. However, highly stable plasmids are below the sensitivity range of these assays. To solve this problem we describe a novel, highly sensitive method to measure plasmid stability based on the selection of plasmid-free cells following elimination of plasmid-containing cells. The assay proposed here is based on an aph-parE cassette. When synthesized in the cell, the ParE toxin induces cell death. ParE synthesis is controlled by a rhamnose-inducible promoter. When bacteria carrying the aph-parE module are grown in media containing rhamnose as the only carbon source, ParE is synthesized and plasmid-containing cells are eliminated. Kanamycin resistance (aph) is ... [摘要]  可以通过阳性选择使用抗生素抗性质粒衍生物来测量质粒稳定性。然而,高度稳定的质粒低于这些测定的灵敏度范围。为了解决这个问题,我们描述了一种新颖的,高度灵敏的方法来测量质粒稳定性,这是基于在含有质粒的细胞消除后,无质粒细胞的选择。这里提出的检测方法是基于aph-parE 盒式磁带。当细胞合成时,ParE毒素诱导细胞死亡。 ParE合成由鼠李糖诱导型启动子控制。当携带 aph-parE 模块的细菌生长在含有鼠李糖作为唯一碳源的培养基中时,合成ParE,消除含有质粒的细胞。进一步使用卡那霉素抗性( aph )来证实在鼠李糖生长的细菌中不存在质粒。

背景 通过使用抗生素抗性质粒衍生物的阳性选择测定质粒稳定性。携带研究质粒的​​细胞在选择性抗生素(Gerdes等人,1985; del Solar等人,1987)的存在下被阳性选择。这种技术的主要缺点是其灵敏度;高度稳定的质粒低于这些测定的敏感性。为了解决这个问题,已经描述了依靠直接选择无质粒细胞例如 - 四环素系统的替代方法(Bochner等人,1980; Maloy和Nunn,1981; Garcia-Quintanilla 等人,2006)。 - ...

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