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Lab-Line Bench Top Orbit Environ Shaker Incubator

Company: Biostad
Catalog#: 3527
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A Sensitive and Specific PCR-based Assay to Quantify Hepatitis B Virus Covalently Closed Circular (ccc) DNA while Preserving Cellular DNA
Author:
Date:
2021-04-20
[Abstract]  

Hepatitis B virus (HBV) is the major cause of liver diseases and liver cancer worldwide. After infecting hepatocytes, the virus establishes a stable episome (covalently closed circular DNA, or cccDNA) that serves as the template for all viral transcripts. Specific and accurate quantification of cccDNA is difficult because infected cells contain abundant replicative intermediates of HBV DNA that share overlapping sequences but arranged in slightly different forms. HBV cccDNA can be detected by Southern blot or qPCR methods which involve enzymatic digestion. These assays are laborious, have limited sensitivity, or require degradation of cellular DNA (which precludes simple normalization). The method described in this protocol, cccDNA inversion quantitative (cinq)PCR, instead uses a series

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[摘要]  [摘要]乙型肝炎病毒(HBV)是全球范围内肝脏疾病和肝癌的主要原因。感染肝细胞后,病毒建立起稳定的附加体(共价闭合的环状DNA或cccDNA),作为所有病毒转录本的模板。cccDNA的特异性和准确定量非常困难,因为被感染的细胞含有丰富的HBV DNA复制中间体,这些中间体共享重叠序列,但排列形式略有不同。HBV cccDNA可以通过涉及酶消化的Southern印迹或qPCR方法进行检测。这些测定费力,灵敏度有限或需要细胞DNA降解(无法进行简单的标准化)。该协议中描述的方法cccDNA反向定量(cinq)PCR,而是使用一系列限制性酶介导的水解和连接反应,将cccDNA转化为反向线性扩增子,该扩增子无法从其他形式的HBV DNA扩增或检测到。重要的是,细胞DNA在样品制备过程中仍可定量,从而可以进行标准化并显着提高精确度。另外,第二线性片段(源自酶消化HBV DNA基因组的单独区域,并以所有形式的HBV DNA存在)可用于同时定量总HBV水平。

图形摘要:

HBV的cccDNA和总HBV DNA的选择性检测使用cinqPCR (转载自涂等人,2020一)。


[背景]乙型肝炎病毒(HBV)是一种小的有包膜病毒,其encapsidates一个部分双链环状DNA基因组,所谓松弛环状(RC)的DNA。感染人肝细胞后,核衣壳被转运至细胞核,其中rcDNA基因组被转化为共价闭合的环状(ccc)DNA。这种游离形式是高度稳定的,并保持慢性HBV感染(Tu等人,2020b ...

Ciliary Assembly/Disassembly Assay in Non-transformed Cell Lines
Author:
Date:
2018-03-20
[Abstract]  The primary cilium is a non-motile sensory organelle whose assembly and disassembly are closely associated with cell cycle progression. The primary cilium is elongated from the basal body in quiescent cells and is resorbed as the cells re-enter the cell cycle. Dysregulation of ciliary dynamics has been linked with ciliopathies and other human diseases. The in vitro serum-stimulated ciliary assembly/disassembly assay has gained popularity in addressing the functions of the protein-of-interest in ciliary dynamics. Here, we describe a well-tested protocol for transfecting human retinal pigment epithelial cells (RPE-1) and performing ciliary assembly/disassembly assays on the transfected cells. [摘要]  主要纤毛是一种非运动感觉细胞器,其装配和拆卸与细胞周期进程密切相关。 初级纤毛在静止细胞中从基体拉长并随着细胞重新进入细胞周期而被吸收。 睫状动力失调与纤毛病和其他人类疾病有关。 体外血清刺激的睫状体装配/分解测定已经在解决睫状动力学中感兴趣的蛋白质的功能方面受到欢迎。 在这里,我们描述了转染人视网膜色素上皮细胞(RPE-1)和对转染细胞进行睫状体装配/分解测定的充分测试的方案。

【背景】初级纤毛是毛发样感觉细胞器,其在G 0 / G 1期出现,并且在细胞周期的S期之前分解(Tucker等, et al。,1979)。先前的研究已经证实,某些未转化的细胞类型(即,甚至是RPE-1细胞,3T3成纤维细胞和小鼠胚胎成纤维细胞[MEFs])可以被饿死以诱导静止和睫状体形成。随后的血清再次添加触发双相睫状体吸收,其在刺激后2小时和24小时达到峰值(Tucker等人,1979; Li等人,2011) 。该现象为文献中常用的血清刺激的睫状体组装/分解测定奠定了基础,以鉴定参与睫状体组装和拆卸的蛋白质(Pugacheva等人,2007; ...

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