Ultraviolet-induced RNA:DNA hybrids interfere with chromosomal DNA synthesis.

Ultraviolet-induced RNA:DNA hybrids interfere with chromosomal DNA synthesis.
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DOI:
10.1093/nar/gkab147
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发表时间:
2021-04-19
影响因子:
14.9
通讯作者:
Kuzminov A
Kuzminov A
中科院分区:
生物学2区
文献类型:
--
作者:
Kouzminova EA;Kuzminov A

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紫外线(UV)诱导DNA中的嘧啶二聚体(PDs)和染色体中的复制依赖性断裂。大肠杆菌中的rnhAB突变体,积累了r -环和单个DNA- rn,通常对DNA损伤具有抗性,但令人惊讶的是,它们对紫外线敏感,即使它们通常会去除pd,这表明染色体损伤是不可修复的。我们在这里表明,RNase H缺陷在紫外线照射后不会引起额外的染色体断裂,但会抑制复制重启后的DNA合成。遗传分析表明,在紫外线照射的rnhAB突变体中形成r环锚定的转录延伸复合物(r环atecs),预测其染色体DNA将积累:(i) RNA:DNA杂交体;(ii)一些缓慢移除的pd。我们确认了这两个特性,并且令人惊讶地发现,这两个特性都依赖于复制重启。最后,对紫外线诱导的RNA进行富集:rnhAB uvrA突变体中的DNA杂交体也对pd进行共富集,表明它们在相同的结构中共居。我们提出pd触发的r -环atec阻断RNase h缺陷突变体的正面复制。
Ultraviolet (UV) induces pyrimidine dimers (PDs) in DNA and replication-dependent fragmentation in chromosomes. The rnhAB mutants in Escherichia coli, accumulating R-loops and single DNA-rNs, are generally resistant to DNA damage, but are surprisingly UV-sensitive, even though they remove PDs normally, suggesting irreparable chromosome lesions. We show here that the RNase H defect does not cause additional chromosome fragmentation after UV, but inhibits DNA synthesis after replication restart. Genetic analysis implies formation of R-loop-anchored transcription elongation complexes (R-loop-aTECs) in UV-irradiated rnhAB mutants, predicting that their chromosomal DNA will accumulate: (i) RNA:DNA hybrids; (ii) a few slow-to-remove PDs. We confirm both features and also find that both, surprisingly, depend on replication restart. Finally, enriching for the UV-induced RNA:DNA hybrids in the rnhAB uvrA mutants also co-enriches for PDs, showing their co-residence in the same structures. We propose that PD-triggered R-loop-aTECs block head-on replication in RNase H-deficient mutants.
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