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NuncTM Biobanking and Cell Culture Cryogenic Tubes, 1.8mL

NuncTM Biobanking and Cell Culture Cryogenic Tubes

Company: Thermo Fisher Scientific
Catalog#: 368632
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CRISPR/Cas9 Editing of the Bacillus subtilis Genome
Author:
Date:
2017-04-20
[Abstract]  A fundamental procedure for most modern biologists is the genetic manipulation of the organism under study. Although many different methods for editing bacterial genomes have been used in laboratories for decades, the adaptation of CRISPR/Cas9 technology to bacterial genetics has allowed researchers to manipulate bacterial genomes with unparalleled facility. CRISPR/Cas9 has allowed for genome edits to be more precise, while also increasing the efficiency of transferring mutations into a variety of genetic backgrounds. As a result, the advantages are realized in tractable organisms and organisms that have been refractory to genetic manipulation. Here, we describe our method for editing the genome of the bacterium Bacillus subtilis. Our method is highly efficient, resulting in ... [摘要]  大多数现代生物学家的基本过程是研究生物体的遗传操作。尽管许多不同的方法用于编辑细菌基因组已经在实验室中使用了数十年,但CRISPR / Cas9技术对细菌遗传学的适应使得研究人员能够以无与伦比的设施来操纵细菌基因组。 CRISPR / Cas9允许基因组编辑更精确,同时也提高将突变转移到各种遗传背景的效率。因此,在遗传操作难以处理的易处理生物和生物体中实现了这些优点。在这里,我们描述了我们编辑枯草芽孢杆菌细菌基因组的方法。我们的方法是高效的,导致精确,无标记的突变。此外,在产生编辑质粒之后,可以将突变快速导入几个遗传背景,大大增加可进行遗传分析的速度。

枯草芽孢杆菌是高度易处理的革兰氏阳性菌。遗传研究适用于使用多种载体通过同源重组快速有效地引入突变。尽管有许多不同的方法来引入B突变。 subtilis,每种方法都有其局限性。一种简单而简单的方法,用于在B中进行突变。枯草芽孢杆菌是基因破坏,其中将质粒整合到感兴趣的基因内(Vagner等人,1998)。主要的局限性包括:1)扰乱操纵子的极地作用的潜力; 2)引进和保留外来DNA; 3)一旦使用抗生素耐药性盒,如果在其他突变的背景下研究给定的突变,则研究者必须使用不同的盒;和4)该方法限于靶向整个基因,并且不能产生更精确的点突变。 ...

Mouse Model of Dengue Virus Infection with Serotypes 1 and 2 Clinical Isolates
Author:
Date:
2016-12-05
[Abstract]  Dengue is a global public health threat caused by infection with any of the 4 related dengue virus serotypes (DENV1-4). Clinical manifestations range from self-limiting febrile illness, known as dengue fever (DF), to life-threatening severe diseases, such as dengue hemorrhagic fever (DHF) or dengue shock syndrome (DSS). Most cases of DHF/DSS are associated with secondary heterotypic infections through a phenomenon that is described as antibody-dependent enhancement of infection (ADE). There are an estimated 400 million human infections and several hundred thousand cases of severe dengue occurring yearly. At present, however, there are no approved antiviral drugs against DENV infection. The lack of a suitable animal model has hampered the evaluation of novel antiviral candidates for DENV ... [摘要]  登革热是由4种相关登革热病毒血清型(DENV1-4)的任一种感染引起的全球公共卫生威胁。临床表现的范围从自限性发热疾病,称为登革热(DF),到危及生命的严重疾病,如登革热出血热(DHF)或登革热休克综合征(DSS)。大多数DHF/DSS病例通过描述为抗体依赖性增强感染(ADE)的现象与继发性异型感染相关。估计每年有4亿人感染和数十万例严重登革热病例。然而,目前,还没有批准的抗DENV感染的抗病毒药物。缺乏合适的动物模型阻碍了DENV感染的新抗病毒候选物的评价。由于DENV在免疫活性小鼠中不良地建立感染,已将AG129小鼠(缺乏I型和II型IFN [干扰素]受体)和小鼠适应的DENV2株应用于能够繁殖人类感染的几种主要病理的登革动物模型。最近,我们开发了具有临床分离株DENV1和DENV2的新的小鼠模型,其将用于药物测试和登革热发病机理研究(Watanabe等人,2016)。在这里我们描述建立临床分离株的登革热小鼠模型的细节;从体外材料制备到体内病毒感染。值得注意的是,由于DENV在小鼠中的感染性在病毒株之间不同,不是所有临床分离株都可以诱导严重的登革热。
关键字:登革热病毒,致命的小鼠模型,临床病毒,病毒感染的抗体依赖性增强,药物测试

[背景] 为了克服DENV在啮齿动物细胞中不能很好复制的缺点,多年来已经进行了许多努力来开发模拟人类登革热感染的小动物模型。近交小鼠模型系统允许实验可变性最小化,并且遗传工程小鼠模型能够再现动物中登革热临床症状的一些方面。过去的研究显示,用DENV2临床分离物感染的AG129小鼠(缺乏I型和II型IFN受体)感染瘫痪的迹象,这是中枢神经系统受累的病症,在人类病例中是罕见的(Shresta等人。,2004)。或者,产生可在AG129小鼠中诱导人类DHF/DSS样疾病的小鼠适应的DENV2毒株,并已用于登革热研究(Shresta等人,2006; ...

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