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.
PRDX1 编码过氧化还原蛋白1(peroxiredoxin 1,PRX I),这是一种位于细胞质、依赖巯基的过氧化物酶,可将过氧化氢和有机氢过氧化物还原,以维持细胞氧化还原稳态。PRX I 通过缓冲活性氧(ROS)水平,影响由过氧化物介导的信号转导,并支持调控增殖、凋亡和应激反应的氧化还原敏感通路,包括 MAPK 和 NF-κB 信号。PRX I 还可通过过氧化还原蛋白–硫氧还蛋白系统参与蛋白巯基的氧化还原调控,并在氧化应激条件下影响细胞骨架动态和 DNA 损伤应答。PRDX1 的表达失衡或氧化状态异常与炎症信号改变、代谢重塑以及肿瘤生物学相关,因此在研究与氧化应激相关疾病过程的机制时具有重要意义。
PRX I 双切酶质粒(h)由一对匹配的质粒组成,专为在 human 细胞系中对 PRDX1 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PRDX1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PRDX1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。