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We report mapping of active replication origins in thaum‐ and euryarchaeal replicons using high‐throughput sequencing‐based marker frequency analysis. The chromosome of the thaumarchaeon Nitrosopumilus maritimus is shown to contain a single origin of replication, whereas the main chromosome in the halophilic euryarchaea Haloferax mediterranei and Haloferax volcanii each contains two origins. All replication...
Cell division is mediated by different mechanisms in different evolutionary lineages. While bacteria and euryarchaea utilize an FtsZ‐based mechanism, most crenarchaea divide using the Cdv system, related to the eukaryotic ESCRT‐III machinery. Intriguingly, thaumarchaeal genomes encode both FtsZ and Cdv protein homologues, raising the question of their division mode. Here, we provide evidence indicating...
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