AID and Reactive Oxygen Species Can Induce DNA Breaks within Human Chromosomal Translocation Fragile Zones.
AID and Reactive Oxygen Species Can Induce DNA Breaks within Human Chromosomal Translocation Fragile Zones.
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DOI:
10.1016/j.molcel.2017.11.011
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发表时间:
2017-12-07
期刊:
影响因子:
16
通讯作者:
Lieber MR
中科院分区:
文献类型:
--
作者:
Pannunzio NR;Lieber MR
DNA double-strand breaks (DSBs) occurring within fragile zones of less than 200 base pairs account for the formation of the most common human chromosomal translocations in lymphoid malignancies, yet the mechanism of how breaks occur remains unknown. Here, we have transferred human fragile zones into S. cerevisiae in the context of a genetic assay to understand the mechanism leading to DSBs at these sites. Our findings indicate that a combination of factors is required to sensitize these regions. Foremost, DNA strand separation by transcription or increased torsional stress can expose these DNA regions to damage from either the expression of human AID or increased oxidative stress. This damage causes DNA lesions that, if not repaired quickly, are prone to nuclease cleavage resulting in DSBs. Our results provide mechanistic insight into why human neoplastic translocation fragile DNA sequences are more prone to enzymes or agents that cause longer-lived DNA lesions. Pannunzio and Lieber insert mammalian DNA fragile zones into an S. cerevisiae genetic assay and explore how distortion of the DNA duplex combined with ssDNA damaging agents target these zones to create double-strand DNA breaks. This work has implications for formation of the recurrent chromosomal translocations of human lymphoid neoplasms.
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DOI:
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