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Proc Natl Acad Sci U S A. 2007 Mar 27;104(13):5608-13. Epub 2007 Mar 19.

Genome-wide coorientation of replication and transcription reduces adverse effects on replication in Bacillus subtilis.

Wang JD, Berkmen MB, Grossman AD.

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Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Abstract

In many bacteria, there is a strong bias for genes to be encoded on the leading strand of DNA, resulting in coorientation of replication and transcription. In Bacillus subtilis, transcription of the majority of genes (75%) is cooriented with replication. By using genome-wide profiling of replication with DNA microarrays, we found that this coorientation bias reduces adverse effects of transcription on replication. We found that in wild-type cells, transcription did not appear to affect the rate of replication elongation. However, in mutants with reversed transcription bias for an extended region of the chromosome, replication elongation was slower. This reduced replication rate depended on transcription and was limited to the region in which the directions of replication and transcription are opposed. These results support the hypothesis that the strong bias to coorient transcription and replication is due to selective pressure for processive, efficient, and accurate replication.

PMID:: 17372224; [PubMed - indexed for MEDLINE]
PMCID:: PMC1838449

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