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Oscillations in supercoiling drive circadian gene expression in cyanobacteria.


ABSTRACT: The cyanobacterium Synechococcus elongatus PCC 7942 exhibits oscillations in mRNA transcript abundance with 24-h periodicity under continuous light conditions. The mechanism underlying these oscillations remains elusive--neither cis nor trans-factors controlling circadian gene expression phase have been identified. Here, we show that the topological status of the chromosome is highly correlated with circadian gene expression state. We also demonstrate that DNA sequence characteristics of genes that appear monotonically activated and monotonically repressed by chromosomal relaxation during the circadian cycle are similar to those of supercoiling-responsive genes in Escherichia coli. Furthermore, perturbation of superhelical status within the physiological range elicits global changes in gene expression similar to those that occur during the normal circadian cycle.

SUBMITTER: Vijayan V 

PROVIDER: S-EPMC2799730 | biostudies-literature | 2009 Dec

REPOSITORIES: biostudies-literature

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Oscillations in supercoiling drive circadian gene expression in cyanobacteria.

Vijayan Vikram V   Zuzow Rick R   O'Shea Erin K EK  

Proceedings of the National Academy of Sciences of the United States of America 20091214 52


The cyanobacterium Synechococcus elongatus PCC 7942 exhibits oscillations in mRNA transcript abundance with 24-h periodicity under continuous light conditions. The mechanism underlying these oscillations remains elusive--neither cis nor trans-factors controlling circadian gene expression phase have been identified. Here, we show that the topological status of the chromosome is highly correlated with circadian gene expression state. We also demonstrate that DNA sequence characteristics of genes t  ...[more]

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