DDX41解决了G-四重复合,以保持红色素基因组完整性,并防止cGAS介导的细胞死亡
Honghao Bi1,2, Kehan Ren1,2, Pan Wang1,2
1Department of Pathology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
Nature communications
|August 5, 2025
概括
有害的DDX41变体与髓状瘤有关. 这项研究揭示了DDX41可以解决G-四重复合体,保持红色素体基因组的稳定性,并抑制cGAS-STING通路.
科学领域:
- 遗传学 是一个遗传学.
- 血液学 血液学 血液学
- 分子生物学分子生物学
背景情况:
- 生殖系DDX41变种是最常见的骨髓瘤 (MNs) 的遗传原因.
- DDX41在MN病原发生中的确切作用仍然在很大程度上是未知的.
- 在特定的造血系中DDX41的功能需要阐明.
研究的目的:
- 调查DDX41在红色形成中的作用及其对髓状瘤的影响.
- 确定DDX41变体对MN发展有所贡献的分子机制.
- 探索DDX41,G-四复合体和基因组稳定性之间的关系.
主要方法:
- 产生Ddx41淘汰赛小鼠模型用于红色素形成研究.
- 分析G-四重复 (G4) 形成和与DDX41.1.一起定位的分析.
- 评估基因组不稳定性,p53激活和cGAS-STING通路的参与.
- 利用人类诱导多能干细胞 (iPSC) 衍生的骨髓器官和患者数据.
主要成果:
- DDX41对于红细胞形成至关重要,但对于其他造血系来说是不可或缺的.
- 缺少DDX41导致G-四重复积累,损害了红色球体基因组的稳定性.
- G4的积累触发了p53的上调,并激活了cGAS-STING通路,从而导致致命性.
- DDX41作为G4溶解酶,其功能在MN相关突变中受损.
结论:
- DDX41是一种关键的G4溶解酶,对于维持红色素体基因组稳定性而言是必不可少的.
- 功能受损的DDX41导致G4积累和cGAS-STING先天免疫通路的激活.
- 这项研究澄清了DDX41在红色素形成中的作用,并提供了对MN病变的洞察.
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