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Calcium Acetate

公司名称: Sigma-Aldrich
产品编号: C1000
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High Resolution Melting Temperature Analysis to Identify CRISPR/Cas9 Mutants from Arabidopsis
Author:
Date:
2018-07-20
[Abstract]  CRISPR/Cas9 made targeted mutagenesis and genome editing possible for many plant species. One of the ways that the endonuclease is used for plant genetics is the creation of loss-of-function mutants, which typically result from erroneous DNA repair through non-homologous end joining (NHEJ) pathway. The majority of erroneous repair events results in single-bp insertion or deletion. While single-bp insertions or deletions (indels) effectively destroy the function of protein-coding genes through frameshift, detection is difficult due to the small size shift. High-resolution melting temperature ... [摘要]  CRISPR / Cas9可以对许多植物物种进行定向诱变和基因组编辑。 内切核酸酶用于植物遗传学的方法之一是产生功能丧失突变体,其通常由通过非同源末端连接(NHEJ)途径的错误DNA修复引起。 大多数错误的修复事件导致单bp插入或缺失。 虽然单bp插入或缺失(插入缺失)通过移码有效地破坏蛋白质编码基因的功能,但由于小的移位,检测很困难。 高分辨率熔解温度分析允许快速检测,并且在PCR扩增感兴趣区域后不需要任何额外的移液步骤。 在该方案中,我们将描述分析潜在的纯合突变体所需的步骤。

【背景】CRISPR / Cas9核酸酶是一种核糖核蛋白,能够在特定的22个核苷酸序列上切割DNA双链。与其他核酸酶(例如锌指核酸酶和转录激活因子样效应核酸酶(TALEN))相比,CRISPR / Cas9系统的主要优点在于序列特异性由RNA赋予,并且不需要针对每种靶序列的单独蛋白质。这大大降低了成本,单个构造可以定位多达32个目标。由于这种低成本和高效率,CRISPR / Cas9系统现在广泛用于许多植物物种(Baltes和Voytas,2015; Belhaj et al。,2015)。

当CRISPR / Cas9诱导的双链DNA断裂被NHEJ途径错误修复时,修复的序列最常导致小插入缺失,其中一个bp插入缺失是最常见的(Ma et al。,2015; ...

Detection and Analysis of Circular RNAs by RT-PCR
Author:
Date:
2018-03-20
[Abstract]  Gene expression in eukaryotic cells is tightly regulated at the transcriptional and posttranscriptional levels. Posttranscriptional processes, including pre-mRNA splicing, mRNA export, mRNA turnover, and mRNA translation, are controlled by RNA-binding proteins (RBPs) and noncoding (nc)RNAs. The vast family of ncRNAs comprises diverse regulatory RNAs, such as microRNAs and long noncoding (lnc)RNAs, but also the poorly explored class of circular (circ)RNAs. Although first discovered more than three decades ago by electron microscopy, only the advent of high-throughput RNA-sequencing (RNA-seq) ... [摘要]  真核细胞中的基因表达在转录和转录后水平受到严格调控。 mRNA转录,mRNA转录和mRNA翻译等后转录过程由RNA结合蛋白(RBPs)和非编码(nc)RNAs控制。大量的ncRNA家族包含多种调控RNA,如microRNAs和长的非编码(lnc)RNAs,但也是探索不足的一类环状RNAs。虽然三十多年前电子显微镜首次发现,但只有高通量RNA测序(RNA-seq)的出现和创新生物信息学管道的开发已经开始允许系统鉴定circRNA(Szabo和Salzman,2016;熊猫,2017b;熊猫等,2017c)。然而,通过RNA测序鉴定的真正的circRNA的验证需要其他分子生物学技术,包括常规或定量(q)聚合酶链反应(PCR)和Northern印迹分析(Jeck和Sharpless,2014)的逆转录(RT)。使用不同引物的环状RNA的RT-qPCR分析已被广泛用于检测,验证和有时定量circRNA(Abdelmohsen等人,2015和2017; Panda等人, ,2017b)。如在此详述的,设计为跨越循环RNA后接连接序列的分歧引物可以特异性扩增circRNA而不是对应的线性RNA。总之,使用不同引物的RT-PCR分析允许直接检测和定量circRNA。

【背景】CircRNAs是共价闭合的,缺少5'或3'末端的单链RNA。虽然它们的起源知之甚少,但它们可以通过称为反向剪接的过程从前体mRNA产生(Panda等人,2017d; ...

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