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Sodium azide

叠氮化钠

Company: Sigma-Aldrich
Catalog#: 71289
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Single-molecule Analysis of DNA Replication Dynamics in Budding Yeast and Human Cells by DNA Combing
Author:
Date:
2017-06-05
[Abstract]  The DNA combing method allows the analysis of DNA replication at the level of individual DNA molecules stretched along silane-coated glass coverslips. Before DNA extraction, ongoing DNA synthesis is labeled with halogenated analogues of thymidine. Replication tracks are visualized by immunofluorescence using specific antibodies. Unlike biochemical and NGS-based methods, DNA combing provides unique information on cell-to-cell variations in DNA replication profiles, including initiation and elongation. Finally, this assay can be used to monitor the effect of DNA lesions on fork progression, arrest and restart. [摘要]  DNA梳理方法允许在沿着硅烷涂覆的玻璃盖玻片拉伸的单个DNA分子的水平上分析DNA复制。在DNA提取前,进行的DNA合成用胸苷的卤化类似物标记。使用特异性抗体通过免疫荧光可视化复制轨迹。与生物化学和基于NGS的方法不同,DNA梳理提供了DNA复制谱中细胞间细胞变化的独特信息,包括引发和延长。最后,该测定可用于监测DNA损伤对叉进展,停止和重新启动的影响。

背景 在称为复制起点的真核染色体上的数千个位点处启动DNA合成。原始激活遵循由检查点激酶和染色质的表观遗传修饰(Prioleau和MacAlpine,2016)控制的定义良好的复制计时程序。复制叉在正常S阶段经常停顿。叉停止是由多个事件引起的,例如DNA损伤,紧密结合的蛋白质复合物和高表达基因的转录(Tourriere和Pasero 2007; Zeman and Cimprich,2013)。真核生物已经制定了不同的策略来应对这种复制压力,包括修复机制来重新启动捕获的叉子和激活休眠复制起源以抢救终末抓捕的叉。
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Assessment of Human Dendritic Cell Antigen Uptake by Flow Cytometry
Author:
Date:
2013-11-20
[Abstract]  Antigen uptake by dendritic cells is the first key step towards induction of antigen-specific T-cell responses. This flow cytometry-based protocol describes the analysis of dendritic cell uptake of soluble antigens through two different mechanisms: non-specific macropinocytosis (using Lucifer Yelloy CH), and receptor-mediated endocytosis (using DQTM Ovalbumin). The protocol is generated based on data presented in Olivar et al. (2013). [摘要]  树突状细胞的抗原摄取是诱导抗原特异性T细胞应答的第一个关键步骤。 这种基于流式细胞术的方案描述了通过两种不同的机制分析树突状细胞摄取可溶性抗原:非特异性大细胞增多症(使用Lucifer Yelloy CH)和受体介导的内吞作用(使用DQ TM 卵清蛋白) 。 该方案是基于Olivar等人(2013)中提供的数据产生的。

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