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 MAX 基因编码 Max 蛋白,这是一种碱性螺旋-环-螺旋(bHLH)亮氨酸拉链型转录因子,可与 MYC 家族蛋白形成二聚体,从而调控依赖 E-box 的基因表达程序,进而控制细胞生长、代谢、核糖体生物发生以及细胞周期进程。Max 也可与 MXD/MNT 伙伴形成抑制性复合物,对 MYC 驱动的转录激活起到制衡作用,并帮助维持转录稳态。通过这些依赖情境的激活型与抑制型二聚体,MAX 在 MYC/MAX/MAD 网络信号中发挥功能,并与染色质调控相互作用,从而塑造谱系特异性与刺激特异性的转录输出。MAX 活性异常或 MYC–MAX 轴受破坏与增殖失调及致癌性转录状态相关,因此 MAX 常被用于肿瘤生物学、代谢适应与转录调控研究。
Max 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 MAX 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MAX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MAX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。