沉默突变显示了RAS Q61癌症的治疗脆弱性
Yoshihisa Kobayashi1,2,3, Chhayheng Chhoeu4, Jiaqi Li5
1Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA. yoshikob@ncc.go.jp.
Nature
|March 3, 2022
概括
研究人员发现一种无声的KRAS突变 (G60G) 对于癌症中的功能性KRAS (Q61K) 瘤基因产生至关重要. 这一发现揭示了一种新的治疗策略,通过干扰拼接来准RAS(Q61) 癌症.
科学领域:
- 癌症学
- 分子生物学
- 遗传学
背景情况:
- 在人类癌症中,RAS家族蛋白质是关键的瘤基因,KRAS (G12C) 抑制剂显示出临床疗效.
- 现有的疗法没有针对G12C以外的NRAS,HRAS或KRAS变体,因此留下了大量未满足的需求.
- RAS蛋白的功能状态与转录后的修改,如替代拼接密切相关.
研究的目的:
- 阐明一种功能性KRAS (Q61K) 变体的产生机制.
- 确定由RAS ((Q61) 突变驱动的癌症的新疗法标.
- 探索沉默突变在瘤基因激活和潜在治疗干预中的作用.
主要方法:
- 使用分子生物学技术研究了无声KRAS G60G突变在KRAS ((Q61K) 蛋白质生产中的作用.
- 分析了与KRAS突变相关的替代拼接事件和过早的蛋白质终止.
- 设计和测试针对突变特异性抗意义寡核酸,以向异常拼接增强剂 (ESE) 基因,以抑制异常拼接.
主要成果:
- 通过防止神秘拼接位的形成和替代拼接,需要一个静音的KRAS G60G突变来产生功能性的KRAS ((Q61K).
- 在三个独立的胰腺癌队列中,KRAS ((Q61K) 和G60G/ A59A静态突变被发现是一致的.
- 针对ESE基因的反意义寡核酸选择性抑制了RAS ((Q61) 功能,在体外和体内表现出治疗效果.
结论:
- 这项研究揭示了RAS ((Q61K) 瘤基因激活的新型依赖拼接机制.
- 这项研究通过向异常拼接来确定RAS(Q61) 癌症的突变选择性治疗策略.
- 这些发现表明,利用拼接漏洞可能是治疗其他基因驱动的癌症的有希望的方法.
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