Dual Processing of R-Loops and Topoisomerase I Induces Transcription-Dependent DNA Double-Strand Breaks.
Dual Processing of R-Loops and Topoisomerase I Induces Transcription-Dependent DNA Double-Strand Breaks.
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DOI:
10.1016/j.celrep.2019.08.041
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发表时间:
2019-09-17
期刊:
影响因子:
8.8
通讯作者:
Sordet O
中科院分区:
文献类型:
--
作者:
Cristini A;Ricci G;Britton S;Salimbeni S;Huang SN;Marinello J;Calsou P;Pommier Y;Favre G;Capranico G;Gromak N;Sordet O
Although accumulation of DNA damage and genomic instability in resting cells can cause neurodegenerative disorders, our understanding of how transcription produces DNA double-strand breaks (DSBs) is limited. Transcription-blocking topoisomerase I cleavage complexes (TOP1ccs) are frequent events that prime DSB production in non-replicating cells. Here, we report a mechanism of their formation by showing that they arise from two nearby single-strand breaks (SSBs) on opposing DNA strands: one SSB from the removal of transcription-blocking TOP1ccs by the TDP1 pathway and the other from the cleavage of R-loops by endonucleases, including XPF, XPG, and FEN1. Genetic defects in TOP1cc removal (TDP1, PNKP, and XRCC1) or in the resolution of R-loops (SETX) enhance DSB formation and prevent their repair. Such deficiencies cause neurological disorders. Owing to the high frequency of TOP1cc trapping and the widespread distribution of R-loops, these persistent transcriptional DSBs could accumulate over time in neuronal cells, contributing to the neurodegenerative diseases.
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影响因子:
19
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Ceccaldi R;Rondinelli B;D'Andrea AD
通讯作者:
D'Andrea AD
影响因子:
64.5
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Buis J;Wu Y;Deng Y;Leddon J;Westfield G;Eckersdorff M;Sekiguchi JM;Chang S;Ferguson DO
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4.5
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5.7
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Al Abo M;Sasanuma H;Liu X;Rajapakse VN;Huang SY;Kiselev E;Takeda S;Plunkett W;Pommier Y
通讯作者:
Pommier Y