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- W2145751704 abstract "Summary While bacteria such as Escherichia coli and Bacillus subtilis harbour a single circular chromosome, some freshwater cyanobacteria have multiple chromosomes per cell. The detailed mechanism(s) of cyanobacterial replication remains unclear. To elucidate the replication origin ( ori ), form and synchrony of the multi‐copy genome in freshwater cyanobacteria Synechococcus elongatus PCC 7942 we constructed strain S . 7942 TK that can incorporate 5‐bromo‐2'‐deoxyuridine (BrdU) into genomic DNA and analysed its de novo DNA synthesis. The uptake of BrdU was blocked under dark and resumed after transfer of the culture to light conditions. Mapping analysis of nascent DNA fragments using a next‐generation sequencer indicated that replication starts bidirectionally from a single ori , which locates in the upstream region of the dnaN gene. Quantitative analysis of BrdU‐labelled DNA and whole‐genome sequence analysis indicated that the peak timing of replication precedes that of cell division and that replication is initiated asynchronously not only among cell populations but also among the multi‐copy chromosomes. Our findings suggest that replication initiation is regulated less stringently in S . 7942 than in E. coli and B. subtilis ." @default.
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- W2145751704 date "2012-01-18" @default.
- W2145751704 modified "2023-10-16" @default.
- W2145751704 title "Light-dependent and asynchronous replication of cyanobacterial multi-copy chromosomes" @default.
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- W2145751704 doi "https://doi.org/10.1111/j.1365-2958.2012.07971.x" @default.
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