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酪氨酰-DNA磷酸二酯酶2(Tdp2)修复DNA-蛋白质交联并防止双链断裂。

Tyrosyl-DNA phosphodiesterase 2 (Tdp2) repairs DNA-protein crosslinks and protects against double strand breaks .

作者信息

Anticevic Ivan, Otten Cecile, Popovic Marta

机构信息

DNA Damage Group, Laboratory for Molecular Ecotoxicology, Department for Marine and Environmental Research, Institute Ruder Boskovic, Zagreb, Croatia.

出版信息

Front Cell Dev Biol. 2024 Aug 20;12:1394531. doi: 10.3389/fcell.2024.1394531. eCollection 2024.

Abstract

DNA-protein crosslinks pose a significant challenge to genome stability and cell viability. Efficient repair of DPCs is crucial for preserving genomic integrity and preventing the accumulation of DNA damage. Despite recent advances in our understanding of DPC repair, many aspects of this process, especially at the organismal level, remain elusive. In this study, we used zebrafish as a model organism to investigate the role of TDP2 (Tyrosyl-DNA phosphodiesterase 2) in DPC repair. We characterized the two orthologs in zebrafish using phylogenetic, syntenic and expression analysis and investigated the phenotypic consequences of silencing in zebrafish embryos. We then quantified the effects of and silencing on cellular DPC levels and DSB accumulation in zebrafish embryos. Our findings revealed that is the main ortholog during embryonic development, while both orthologs are ubiquitously present in adult tissues. Notably, the ortholog is phylogenetically closer to human TDP2. Silencing of , but not , resulted in the loss of Tdp2 activity in zebrafish embryos, accompanied by the accumulation of DPCs and DSBs. Our findings contribute to a more comprehensive understanding of DPC repair at the organismal level and underscore the significance of TDP2 in maintaining genome stability.

摘要

DNA-蛋白质交联对基因组稳定性和细胞活力构成了重大挑战。高效修复DNA-蛋白质交联对于维持基因组完整性和防止DNA损伤积累至关重要。尽管我们对DNA-蛋白质交联修复的理解最近取得了进展,但这一过程的许多方面,尤其是在生物体水平上,仍然难以捉摸。在本研究中,我们使用斑马鱼作为模式生物来研究TDP2(酪氨酰-DNA磷酸二酯酶2)在DNA-蛋白质交联修复中的作用。我们通过系统发育、共线性和表达分析对斑马鱼中的两个直系同源物进行了表征,并研究了在斑马鱼胚胎中沉默的表型后果。然后,我们量化了沉默对斑马鱼胚胎中细胞DNA-蛋白质交联水平和双链断裂积累的影响。我们的研究结果表明,在胚胎发育过程中是主要的直系同源物,而两个直系同源物在成体组织中普遍存在。值得注意的是,直系同源物在系统发育上更接近人类TDP2。沉默而非导致斑马鱼胚胎中Tdp2活性丧失,同时伴随着DNA-蛋白质交联和双链断裂的积累。我们的研究结果有助于在生物体水平上更全面地理解DNA-蛋白质交联修复,并强调了TDP2在维持基因组稳定性中的重要性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa77/11369425/8abc4365e8a3/fcell-12-1394531-g001.jpg

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