{{'Search' | translate}}
 

GeneJET PCR Purification Kit

Company: Thermo Fisher Scientific
Catalog#: K0701
Bio-protocol()
Company-protocol()
Other protocol()

Rolling Circle Amplification to Screen Yam Germplasm for Badnavirus Infections and to Amplify and Characterise Novel Badnavirus Genomes
Author:
Date:
2018-01-05
[Abstract]  Since the first discovery of badnaviruses (family Caulimoviridae, genus Badnavirus) in yam (Dioscorea spp.) germplasm in the 1970s (Harrison and Roberts, 1973), several hundred partial badnavirus reverse transcriptase (RT)-ribonuclease H (RNaseH) sequences have been characterised (Kenyon et al., 2008; Bousalem et al., 2009), but only a few complete Dioscorea bacilliform virus (DBV) genome sequences have been reported (Phillips et al., 1999; Seal and Muller, 2007; Bömer et al., 2016 and 2017; Sukal et al., 2017; Umber et al., 2017). We have optimised a workflow involving total nucleic acid extractions and rolling circle amplification (RCA) combined with restriction enzyme analysis for the detection ... [摘要]  自二十世纪七十年代山药(Dioscorea spp。)种质中首次发现坏病毒属(家庭花椰菜科,属于病毒属)之后(Harrison和Roberts, 1973),已经表征了数百个部分坏死病毒逆转录酶(RT) - 核糖核酸酶H(RNaseH)序列(Kenyon等人,2008; Bousalem等人,2009年),但仅有少数几种完整的Dioscorea杆状病毒(DBV)基因组序列已被报道(Phillips等,1999; Seal和Muller,2007;Bömer等, 2016和2017; Sukal等人,2017; Umber等人,2017)。我们优化了总核酸提取和滚环扩增(RCA)结合限制性酶分析的工作流程,以检测和扩增山药种质中存在的DBV。我们已经使用这种方法成功地揭示了三种新型附加体阴性坏死病毒(Bömer等人,2016年)。我们提出这是变性梯度凝胶电泳的补充方法,其能够快速指示坏死病毒多样性以及在宿主基因组中鉴定潜在整合的坏死病毒序列(Turaki等人,2017年) )。在这里,我们描述了一步一步的方案来筛选山药种质的坏死病毒感染使用RCA作为一个有效的研究工具,在扩增和表征的新型坏死病毒基因组。

【背景】RCA是经常用于扩增环状DNA病毒基因组的序列无关的策略(Rector等人,2004)。 Phi29聚合酶介导的RCA技术用于(i)检测新型病毒; ...

Method for Multiplexing CRISPR/Cas9 in Saccharomyces cerevisiae Using Artificial Target DNA Sequences
Author:
Date:
2017-09-20
[Abstract]  Genome manipulation has become more accessible given the advent of the CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) editing technology. The Cas9 endonuclease binds a single stranded (single guide) RNA (sgRNA) fragment that recruits the complex to a corresponding genomic target sequence where it induces a double stranded break. Eukaryotic repair systems allow for the introduction of exogenous DNA, repair of existing mutations, or deletion of endogenous gene products. Targeting of Cas9 to multiple genomic positions (termed ‘multiplexing’) is achieved by the expression of multiple sgRNAs within the same nucleus. However, an ongoing concern of the CRISPR field has been the accidental targeting of Cas9 to alternative (‘off-target’) DNA locations within a genome. We ... [摘要]  鉴于CRISPR(集群定期间隔短回归重复)编辑技术的出现,基因组操纵变得更加易于使用。 Cas9核酸内切酶将募集复合物的单链(单向导)RNA(sgRNA)片段结合到相应的基因组靶序列,引发双链断裂。真核修复系统允许引入外源DNA,修复现有突变或内源基因产物的缺失。通过在同一核内表达多个sgRNA来实现Cas9对多个基因组位置的定位(称为“多重”)。然而,CRISPR领域的持续关注是将Cas9意外地定位到基因组内的替代(“脱靶”)DNA位置。我们将安装的人造Cas9靶序列的使用(称为人造基因座上的Cas9复制)描述为允许(i)与单个sgRNA复用的酵母基因组中的用途; (ii)减少/消除可能的脱靶效应,以及(iii)精确控制预定目标序列的放置。
【背景】CRISPR(集群定期间隔回归重复)机制已经在原核生物中演变为具有很高精度编辑任何基因组的能力的原始适应性免疫系统(Jinek等,2012; Sorek等,2013)。这种生物技术需要使用来自化脓性链球菌(或othologous物种)的内切核酸酶(Cas9),单个RNA'引导'序列和外源供体DNA(如果需要)。仅在短短几年内,CRISPR / ...

Comments