类似ASO的DNA酶的化学进化,用于在细胞中有效和延长的基因沉默
Yingyu Liu1, Sheyu Zhang1, Meiqi Zhang1,2
1Hangzhou Institute of Medicine (HIM), Chinese Academy of Sciences, Hangzhou, Zhejiang 310000, China.
Nucleic acids research
|March 4, 2025
概括
化学修饰的DNA酶,灵感来自于反意义的寡核酸药物,精确地沉默引起疾病的信使RNA (mRNA). 这些增强的DNA酶表现出更好的稳定性,并有效地减少结肠癌细胞中的瘤性MYC,提供了一种新的治疗基因沉默方法.
科学领域:
- 分子生物学分子生物学
- 奥利冈核酸治疗药物 治疗药物
- 基因沉默是一种基因沉默.
背景情况:
- 反感性寡核酸 (ASOs) 和小干扰RNA (siRNA) 是已建立的基因沉默疗法,针对信使RNA (mRNA).
- 分裂RNA的DNA酶 (DNAzymes) 提供精确的等位基因特异性RNA抑制,但需要优化用于治疗.
研究的目的:
- 通过结合在成功的ASO药物中发现的修改来化学进化10-23DNA酶.
- 为了提高DNA酶的催化效率,细胞内稳定性和治疗潜力,用于基因沉默.
主要方法:
- 将ASO类修饰物 (2'-, 2'-O-甲基, 2'-O-甲氧乙基,酸骨干) 纳入10-23DNA酶中.
- 对结构化RNA标的DNA酶活性,细胞内稳定性和基因沉默功效 (eGFP,c-MYC) 的评估.
- 在结肠癌细胞中评估细胞效应 (细胞循环停止,细胞亡) 和裂解精度 (RACE-PCR,桑格测序).
主要成果:
- 类似ASO的DNA酶证明了结构化RNA标的高效分裂和长时间的细胞内稳定性.
- 观察到外源性EGFP和内源性瘤性c-MYCmRNA和蛋白质水平的下调.
- 在结肠癌细胞中,c-MYC下调导致细胞循环停止,增殖减少和亡增加.
- 精确的,特定于位点的mRNA裂变被证实具有最小的RNase H激活.
结论:
- 化学进化的10-23DNAzymes将ASO优势与DNAzyme催化剂的多功能性合并.
- 这些类似ASO的DNA酶代表了一种具有治疗潜力的强大新型基因抑制剂.
- 这项研究标志着治疗性DNA酶的发展取得了重大进展.
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