The Double Nickase Plasmid features a U6 promoter for sgRNA expression, a 20 nt targeting sequence, and a gRNA scaffold to guide Cas9n. It includes a CBh promoter for Cas9n (D10A) and puromycin resistance, GFP for transfection verification, and nuclear localization signals (NLS). The 2A peptide allows co-expression of Cas9n and Puro from a single promoter, enabling precise genome editing with reduced off-target effects.
The Double Nickase Plasmid features a U6 promoter for sgRNA expression, a 20 nt targeting sequence, and a gRNA scaffold to guide Cas9n. It includes a CBh promoter for Cas9n (D10A) and puromycin resistance, GFP for transfection verification, and nuclear localization signals (NLS). The 2A peptide allows co-expression of Cas9n and Puro from a single promoter, enabling precise genome editing with reduced off-target effects.
Cas9n Nickase gRNA Plasmid Targeting: Dual gRNA plasmids create single-strand nicks at precise DNA sequences for efficient genome editing using Cas9n Nickase.
This image illustrates the Cas9n Nickase mechanism used for precise genome editing. Two plasmids (Plasmid 1 and Plasmid 2) are shown, each containing a targeted DNA sequence. The system utilizes single-guide RNAs (sgRNA) to direct Cas9n Nickase to specific genomic locations, represented by the blue and pink DNA strands. The sgRNA scaffold aids in guiding Cas9n to the 20 nucleotide (nt) target sequence on the DNA. Cas9n makes single-strand cuts at NCC and NGG sites, enabling precise gene modifications without creating double-strand breaks.
The Double Nickase Plasmid features a U6 promoter for sgRNA expression, a 20 nt targeting sequence, and a gRNA scaffold to guide Cas9n. It includes a CBh promoter for Cas9n (D10A) and puromycin resistance, GFP for transfection verification, and nuclear localization signals (NLS). The 2A peptide allows co-expression of Cas9n and Puro from a single promoter, enabling precise genome editing with reduced off-target effects.
人类ARFGAP1基因编码ADP-核糖基化因子GTP酶激活蛋白1(ARF GTPase-activating protein 1),这是一种与高尔基体相关的调控因子,能够加速ARF家族小GTP酶的GTP水解,从而协调囊泡出芽与包被动态;通过调节COPI依赖的逆行运输以及内体—高尔基体转运,ARFGAP1促进膜曲率形成、货物分选并维持高尔基体结构完整性,将ARF信号与更广泛的分泌与回收通路联系起来;在蛋白质稳态与细胞器运输受扰的情境中(包括涉及囊泡运输与蛋白质处理的神经退行性疾病相关机制),ARFGAP1介导的转运失衡已受到研究关注;对ARFGAP1进行基因编辑可在人体细胞系统中通过敲除/敲入模型、互作网络绘制以及转运实验等手段,用于开展关于ARF通路调控、囊泡生物发生与高尔基体功能的机制研究。
ARFGAP1 双切酶质粒(h2)由一对匹配的质粒组成,专为在 human 细胞系中对 ARFGAP1 位点进行高特异性编辑而设计。每个质粒分别表达Cas9 D10A切口酶和针对ARFGAP1内不同DNA链的独特sgRNA。当这两种切口酶被引导至相邻但位于DNA链相反侧的位点时,会产生错位的单链切口,从而共同形成错位双链断裂,这需要两个引导RNA在靶位点上协同发挥作用。由此产生的DNA断裂通过内源性细胞修复途径(最常见的是非同源末端连接(NHEJ))得到修复,从而导致插入或缺失,进而破坏ARFGAP1的功能。通过要求双sgRNA在靶位点结合,双切口方法提高了编辑特异性,并为需要对靶向精度进行额外控制的应用提供了互补的CRISPR策略。