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端粒SUMO水平影响APB形成路径和ALT效率的选择

Rongwei Zhao¹, Allison Wivagg¹, Rachel M Lackner²

¹Department of Biology, Carnegie Mellon University, Pittsburgh, PA 15213, USA.

bioRxiv : the preprint server for biology

|February 3, 2025

概括

替代延长端粒 (ALT) 途径癌症通过新核或融合形成ALT端粒相关的PML体 (APB). 高SUMO水平促进APB核化,增强ALT活动.

科学领域:

细胞生物学细胞生物学
遗传学是一个遗传学.
癌症研究癌症研究

背景情况:

许多癌症都使用替代延长端粒 (ALT) 途径来维持端粒.
ALT端粒DNA合成发生在与ALT端粒相关的PML体 (APBs) 中,但它们的形成机制尚不清楚.

研究的目的:

阐明APB形成的机制.
调查SUMOylation在APB组装和ALT活动中的作用.

主要方法:

利用时间延迟成像和CRISPR敲门技术来追踪内源性前兆细胞白血病 (PML) 蛋白质动态.
研究了在APB形成中对SUMO和SUMO相互作用动机 (SIMs) 的要求.
评估了SUMO水平对BLM招聘和端粒DNA合成的影响.

主要成果:

证明APB通过两种不同的途径形成:在端粒中新核化或与先前存在的PML体融合.
证实核化和融合途径都取决于SUMO-SIM相互作用.
观察到APB核化与SUMO水平升高和DNA基酶BLM的增强招募相关,导致端粒DNA合成增加.
表明增加端粒中的SUMO水平进一步促进了APB核化,BLM丰富和端粒DNA合成.

结论:

端粒中的高SUMO水平通过核化依赖的途径促进APB的形成.
这种由SUMO驱动的核化增强了ALT活性,这表明ALT阳性癌症的潜在治疗标.

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