Lagging-strand replication shapes the mutational landscape of the genome

Article

关键词: OKAZAKI FRAGMENT MATURATION;    DNA-POLYMERASE-ALPHA;    MISMATCH REPAIR;    RIBONUCLEOTIDE INCORPORATION;    SACCHAROMYCES-CEREVISIAE;    MAMMALIAN GENOME;    YEAST;    FIDELITY;    ERRORS;    DELTA;   

DOI  :  10.1038/nature14183

来源: SCIE

【 摘 要 】

The origin of mutations is central to understanding evolution and of key relevance to health. Variation occurs non-randomly across the genome, and mechanisms for this remain to be defined. Here we report that the 5' ends of Okazaki fragments have significantly increased levels of nucleotide substitution, indicating a replicative origin for such mutations. Using a novel method, emRiboSeq, we map the genome-wide contribution of polymerases, and show that despite Okazaki fragment processing, DNA synthesized by error-prone polymerase-alpha (Pol-alpha) is retained in vivo, comprising approximately 1.5% of the mature genome. We propose that DNA-binding proteins that rapidly re-associate post-replication act as partial barriers to Pol-delta-mediated displacement of Pol-alpha-synthesized DNA, resulting in incorporation of such Pol-a tracts and increased mutation rates at specific sites. We observe a mutational cost to chromatin and regulatory protein binding, resulting in mutation hotspots at regulatory elements, with signatures of this process detectable in both yeast and humans.

【 授权许可】

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