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Proteinase K

来自Tritirachium album的蛋白酶K.

Company: Sigma-Aldrich
Catalog#: P4850
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Robust Generation of Knock-in Cell Lines Using CRISPR-Cas9 and rAAV-assisted Repair Template Delivery
Author:
Date:
2017-04-05
[Abstract]  The programmable Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)-associated nuclease 9 (Cas9) technology revolutionized genome editing by providing an efficient way to cut the genome at a desired location (Ledford, 2015). In mammalian cells, DNA lesions trigger the error-prone non-homologous end joining (NHEJ) DNA repair mechanism. However, in presence of a DNA repair template, Homology-Directed Repair (HDR) can occur leading to precise repair of the lesion site. This last process can be exploited to enable precise knock-in changes by introducing the desired genomic alteration on the repair template. In this protocol we describe the delivery of long repair templates (> 200 nucleotides) using recombinant Adeno Associated Virus (rAAV) for CRISPR-Cas9-based knock-in of a ... [摘要]  可编程集群定期间隔短回归度(CRISPR)相关核酸酶9(Cas9)技术通过提供在所需位置切割基因组的有效方式,彻底改变了基因组编辑(Ledford,2015)。 在哺乳动物细胞中,DNA损伤触发易发生非同源末端连接(NHEJ)DNA修复机制。 然而,在DNA修复模板的存在下,可以发生同源性定向修复(HDR),导致病变部位的精确修复。 可以利用最后的方法,通过在修复模板上引入所需的基因组改变来实现精确的敲入变化。 在本协议中,我们描述了使用重组腺相关病毒(rAAV)在人细胞系中进行基于CRISPR-Cas9的C-末端标签序列敲入的长修复模板(> 200个核苷酸)的递送。

尽管有关CRISPR-Cas9产生的敲门模型系统的大量报告,敲门砖报告仍然落后。由于许多应用,产生敲入细胞系仍然是基因组编辑的明显目标。敲入改变的引入通常依赖于修复模板DNA的存在,并且在位点特异性双链(ds)DNA断裂被引入接近改变位点的基因组中后,HDR修复机制的激活。不同的模板可以传送到修复机器,范围从含有广泛同源区域和可选选择盒的经典线性化载体到约200个核苷酸的单链(ss)DNA寡核苷酸(Chen等人, ...

TUNEL Assay in Kiwifruit Stigmatic Arms
Author:
Date:
2015-04-05
[Abstract]  Terminal deoxynucleotidyl transferase-mediated dUTP nick end labelling (TUNEL) is a method for detecting DNA fragmentation by labelling the 3' terminal end of nucleic acids. This method can be used both in animal and plant tissues. In animal tissues, the use of Proteinase K is sufficient for permeabilizing the cells and to obtain optimal labelling, but in plant tissues, the presence of the cell wall, does not allow proper labelling. For this reason, we carried out several modifications to the original TUNEL protocol (ApoAlert® DNA Fragmentation Assay Kit, Clontech) to obtain an optimal labelling. These modifications were additional treatments with cellulase, Triton X-100 and Proteinase K. Also, we describe the optimization of the positive controls by adjusting the units of ... [摘要]  末端脱氧核苷酸转移酶介导的dUTP缺口末端标记(TUNEL)是通过标记核酸的3'末端来检测DNA断裂的方法。该方法可以在动物和植物组织中使用。在动物组织中,蛋白酶K的使用足以使细胞透化并获得最佳标记,但是在植物组织中,细胞壁的存在不允许适当的标记。因此,我们对原始TUNEL方案(ApoAlert DNA Fragmentation Assay Kit,Clontech)进行了几个修改,以获得最佳标记。这些修饰是用纤维素酶,Triton X-100和蛋白酶K的另外处理。此外,我们通过调节所用的DNase的单位描述阳性对照的优化。用于复染的PI浓度也被特别调节以避免过度的背景噪声,并因此正确地观察标记的和未标记的核。该工作还描述了以不干扰TUNEL标记的方式收集,存储和包括样品(特别是污点臂)的附加方案。

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