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Selection for Chromosome Architecture in Bacteria

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Abstract

Bacterial chromosomes are immense polymers whose faithful replication and segregation are crucial to cell survival. The ability of proteins such as FtsK to move unidirectionally toward the replication terminus, and direct DNA translocation into the appropriate daughter cell during cell division, requires that bacterial genomes maintain an architecture for the orderly replication and segregation of chromosomes. We suggest that proteins that locate the replication terminus exploit strand-biased sequences that are overrepresented on one DNA strand, and that selection increases with decreased distance to the replication terminus. We report a generalized method for detecting these architecture imparting sequences (AIMS) and have identified AIMS in nearly all bacterial genomes. Their increased abundance on leading strands and decreased abundance on lagging strands toward replication termini are not the result of changes in mutational bias; rather, they reflect a gradient of long-term positive selection for AIMS. The maintenance of the pattern of AIMS across the genomes of related bacteria independent of their positions within individual genes suggests a well-conserved role in genome biology. The stable gradient of AIMS abundance from replication origin to terminus suggests that the replicore acts as a target of selection, where selection for chromosome architecture results in the maintenance of gene order and in the lack of high-frequency DNA inversion within replicores.

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Acknowledgments

This work was supported by Grant MCB-0217278 from the National Science Foundation to J.G.L. and a fellowship from the Pennsylvania Space Consortium to H.H. We thank Thomas Murphy VII for assistance with automated global pairwise sequence comparisons.

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  1. Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, 15260, USA

    Heather Hendrickson & Jeffrey G. Lawrence

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  1. Heather Hendrickson
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Correspondence to Jeffrey G. Lawrence.

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Hendrickson, H., Lawrence, J.G. Selection for Chromosome Architecture in Bacteria. J Mol Evol 62, 615–629 (2006). https://doi.org/10.1007/s00239-005-0192-2

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