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Errol Friedberg suggested that I write a biographical account of the work carried out in my lab for the Historical Reflections section of the DNA Repair. Although I started out studying meiotic recombination, I have spent much of the last four and a half decades focused on trying to understand the mechanism underlying induced mutagenesis, which led me into what was eventually called DNA damage tolerance,...
Benzo[a]pyrene exerts its mutagenic effects via induction of benzo[a]pyrene-diol-epoxide (BPDE)–DNA adducts. Such helix-distorting adducts are not always successfully repaired prior to DNA replication, which may result in a blocked replication fork. To alleviate this stall, cells utilize DNA damage tolerance systems involving either error-free damage avoidance or error-prone translesion synthesis...
In tissues of multicellular organisms, DNA lesions that block replication can disrupt division of the transiently amplifying (TA) cells and stem cells that drive growth. To study how tissue growth is maintained despite DNA damage, stem cells and other cell types must be clearly identifiable. In plants, root growth depends directly on cell divisions in the root meristem. In Arabidopsis thaliana, cell...
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