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Exonuclease III

公司名称: Promega
产品编号: M1811
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Centromere Chromosome Orientation Fluorescent in situ Hybridization (Cen-CO-FISH) Detects Sister Chromatid Exchange at the Centromere in Human Cells
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2018-04-05
[Abstract]  Human centromeres are composed of large tandem arrays of repetitive alpha satellite DNA, which are often sites of aberrant rearrangement in cancers (Mitelman et al., 1997; Padilla-Nash et al., 2001). To date, annotation of the human centromere repetitive sequences remains incomplete, greatly hindering in-depth functional studies of these regions essential for chromosome segregation. In order to monitor sister chromatid exchange happening at the centromere (C-SCE) due to recombination and mutagenic events, I have applied the Chromosome-Orientation Fluorescence in situ ... [摘要]  人类着丝粒由重复的α卫星DNA的大串联阵列组成,这些细胞通常是癌症中异常重排的位点(Mitelman等人,1997; Padilla-Nash等人 >,2001)。迄今为止,对人类着丝粒重复序列的注释仍然不完整,极大地妨碍了这些区域对染色体分离至关重要的深入功能研究。为了监测由于重组和诱变事件而在着丝粒(C-SCE)上发生姊妹染色单体交换,我将染色体定位荧光原位杂交(CO-FISH)技术应用于着丝粒( Cen-CO-FISH)在人类细胞中的表达。这种基于杂交的方法包括(1)通过单轮复制掺入核苷酸类似物,(2)新合成的DNA链的酶消化和(3)单链探针的后续杂交,在不存在变性步骤的情况下。所产生的信号允许基于DNA的5'-3'方向性差异地标记每个姊妹染色单体,并评估指示C-SCE的异常染色模式。应用于人类着丝粒的Cen-CO-FISH方法揭示,人类着丝粒确实在循环细胞中发生重组,导致C-SCE,并且在经历衰老的癌细胞系和原代细胞中着丝粒不稳定性增强(Giunta和Funabiki,2017)。在这里,我介绍了人类细胞中Cen-CO-FISH方法的制备,实验程序和数据采集的详细方案。它还包括该技术的概念性概述,以及代表性图像和评分准则的示例。 Cen-CO-FISH是促进着丝粒重复探索的有用工具。

【背景】人类基因组计划于2003年标记为完成,但它遗漏了超过10%的人类重复DNA(de ...

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