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Creators/Authors contains: "Hollingsworth, Suzanne"

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  1. Abstract Replication initiation, elongation and completion are tightly coordinated to ensure that all sequences replicate precisely once each generation. UV‐induced DNA damage disrupts replication and delays elongation, which may compromise this coordination leading to genome instability and cell death. Here, we profiled theEscherichia coligenome as it recovers from UV irradiation to determine how these replicational processes respond. We show thatoriCinitiations continue to occur, leading to copy number enrichments in this region. At late times, the combination of neworiCinitiations and delayed elongating forks converging in the terminus appear to stress or impair the completion reaction, leading to a transient over‐replication in this region of the chromosome. In mutants impaired for restoring elongation, includingrecA,recFanduvrA, the genome degrades or remains static, suggesting that cell death occurs early after replication is disrupted, leaving partially duplicated genomes. In mutants impaired for completing replication, includingrecBC,sbcCD xonAandrecG, the recovery of elongation and initiation leads to a bottleneck, where the nonterminus region of the genome is amplified and accumulates, indicating that a delayed cell death occurs in these mutants, likely resulting from mis‐segregation of unbalanced or unresolved chromosomes when cells divide. 
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