Pervasive lesion segregation shapes cancer genome evolution
Pervasive lesion segregation shapes cancer genome evolution
复制标题
普遍的病变分离塑造癌症基因组进化
DOI:
10.1101/868679
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Aitken S
中科院分区:
文献类型:
--
作者:
Aitken S
Cancers arise through the acquisition of oncogenic mutations and grow by clonal expansion,. Here we reveal that most mutagenic DNA lesions are not resolved into a mutated DNA base pair within a single cell cycle. Instead, DNA lesions segregate, unrepaired, into daughter cells for multiple cell generations, resulting in the chromosome-scale phasing of subsequent mutations. We characterize this process in mutagen-induced mouse liver tumours and show that DNA replication across persisting lesions can produce multiple alternative alleles in successive cell divisions, thereby generating both multiallelic and combinatorial genetic diversity. The phasing of lesions enables accurate measurement of strand-biased repair processes, quantification of oncogenic selection and fine mapping of sister-chromatid-exchange events. Finally, we demonstrate that lesion segregation is a unifying property of exogenous mutagens, including UV light and chemotherapy agents in human cells and tumours, which has profound implications for the evolution and adaptation of cancer genomes.
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