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首页> 外文期刊>Molecular and Cellular Biology >The RecQ4 Orthologue Hrq1 Is Critical for DNA Interstrand Cross-Link Repair and Genome Stability in Fission Yeast
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The RecQ4 Orthologue Hrq1 Is Critical for DNA Interstrand Cross-Link Repair and Genome Stability in Fission Yeast

机译:RecQ4直系同源基因Hrq1对于裂变酵母中的DNA链间交联修复和基因组稳定性至关重要

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摘要

Of the five human RecQ family helicases, RecQ4, BLM, and WRN suppress distinct genome instability-linked diseases with severe phenotypes, often with indeterminate etiologies. Here, we functionally define Hrq1, a novel orthologue of RecQ4 from fission yeast. Biochemical analysis of Hrq1 reveals a DEAH box- and ATP-dependent 3′-5′ helicase activity on various DNA substrates, including bubbles but not blunt duplexes, characteristic of the RecQ family. Cells lacking Hrq1 suffer spontaneous genomic instability and, consequently, require homologous recombination repair and the DNA damage checkpoint for viability. Hrq1 supports the nucleotide excision repair of DNA damage caused by the chemotherapeutic agent cisplatin and, in certain genetic contexts, UV light. Genetic epistasis analyses reveal that Hrq1 acts parallel to the PCNA/Ubc13/Mms2-dependent postreplication repair (PRR) pathway. Thus, in hrq1Δ cells, lesions are channeled through the PRR pathway, yielding hyperrecombinant and mutator phenotypes; analogous defects may underlie the genetic instability and diseases associated with RecQ4 dysfunction.
机译:在五种人类RecQ家族解旋酶中,RecQ4,BLM和WRN抑制具有严重表型且通常病因不明的独特基因组不稳定性相关疾病。在这里,我们从功能上定义了Hrq1,这是一种来自裂变酵母的RecQ4的新型直向同源物。 Hrq1的生化分析揭示了RecQ家族特有的各种DNA底物上包括DEAH盒和ATP依赖性3'-5'解旋酶的活性,包括气泡但不包括钝双链体。缺乏Hrq1的细胞会遭受自发的基因组不稳定,因此,需要同源重组修复和DNA损伤检查点以保持活力。 Hrq1支持核苷酸切割修复由化学治疗药物顺铂和在某些遗传背景下的紫外线所引起的DNA损伤。遗传上位分析表明,Hrq1与PCNA / Ubc13 / Mms2依赖性复制后修复(PRR)途径平行。因此,在 hrq1 Δ细胞中,病变通过PRR途径传导,产生超重组和突变表型。类似的缺陷可能是遗传不稳定和与RecQ4功能障碍相关的疾病的基础。

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