DEK oncoprotein participates in heterochromatin replication via SUMO-dependent nuclear bodies.

DEK oncoprotein participates in heterochromatin replication via SUMO-dependent nuclear bodies.
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DOI:
10.1242/jcs.261329
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发表时间:
2023-12-01
影响因子:
4
通讯作者:
--
中科院分区:
生物学2区
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--
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染色质结构的正确遗传是维持基因组功能和细胞身份以及防止细胞转化的关键。 DEK 是一种保守的非组蛋白染色质蛋白,已被认为具有促进肿瘤的特性,其过度表达与各种癌症类型的不良预后相关。在细胞水平上,DEK 显示出多效性功能,影响分化、细胞凋亡和干细胞性,但特征性的致癌机制仍然难以捉摸。在这里,我们报告了 DEK 体的鉴定,DEK 的焦点组装体通常发生在特定但未识别的异染色质复制位点,仅发生在 S 期晚期。在这些体内,DEK 直接定位于活性复制体附近,这与异染色质早期成熟的功能一致。在突变和生化分析的支持下,高通量 siRNA 筛选将 SUMO 确定为 DEK 体形成的调节因子,将 DEK 与控制染色质状态和细胞命运的复杂 SUMO 蛋白网络联系起来。这项工作结合并完善了我们之前关于 DEK 作为异染色质完整性和促进应激下复制的重要因素的数据,并描绘了进一步研究的途径,以揭示 DEK 对癌症发展的贡献。 人类癌蛋白 DEK 形成受 SUMO 途径调节的核体,并定位于组成型异染色质复制的活性位点。
The correct inheritance of chromatin structure is key for maintaining genome function and cell identity and preventing cellular transformation. DEK, a conserved non-histone chromatin protein, has recognized tumor-promoting properties, its overexpression being associated with poor prognosis in various cancer types. At the cellular level, DEK displays pleiotropic functions, influencing differentiation, apoptosis and stemness, but a characteristic oncogenic mechanism has remained elusive. Here, we report the identification of DEK bodies, focal assemblies of DEK that regularly occur at specific, yet unidentified, sites of heterochromatin replication exclusively in late S-phase. In these bodies, DEK localizes in direct proximity to active replisomes in agreement with a function in the early maturation of heterochromatin. A high-throughput siRNA screen, supported by mutational and biochemical analyses, identifies SUMO as one regulator of DEK body formation, linking DEK to the complex SUMO protein network that controls chromatin states and cell fate. This work combines and refines our previous data on DEK as a factor essential for heterochromatin integrity and facilitating replication under stress, and delineates an avenue of further study for unraveling the contribution of DEK to cancer development. The human oncoprotein DEK forms nuclear bodies that are regulated by the SUMO pathway and localize to active sites of constitutive heterochromatin replication.
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