Abstract:
:Studies in experimental systems have identified a multitude of mutational mechanisms including DNA replication infidelity and DNA damage followed by inefficient repair or replicative bypass. However, the relative contributions of these mechanisms to human germline mutation remain unknown. Here, we show that error-prone damage bypass on the lagging strand plays a major role in human mutagenesis. Transcription-coupled DNA repair removes lesions on the transcribed strand; lesions on the non-transcribed strand are preferentially converted into mutations. In human polymorphism we detect a striking similarity between mutation types predominant on the non-transcribed strand and on the strand lagging during replication. Moreover, damage-induced mutations in cancers accumulate asymmetrically with respect to the direction of replication, suggesting that DNA lesions are resolved asymmetrically. We experimentally demonstrate that replication delay greatly attenuates the mutagenic effect of ultraviolet irradiation, confirming that replication converts DNA damage into mutations. We estimate that at least 10% of human mutations arise due to DNA damage.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Seplyarskiy VB,Akkuratov EE,Akkuratova N,Andrianova MA,Nikolaev SI,Bazykin GA,Adameyko I,Sunyaev SRdoi
10.1038/s41588-018-0285-7subject
Has Abstractpub_date
2019-01-01 00:00:00pages
36-41issue
1eissn
1061-4036issn
1546-1718pii
10.1038/s41588-018-0285-7journal_volume
51pub_type
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