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Nucleic Acids Research, 1995, Vol. 23, No. 8 1350-1353
© 1995

GENOME STRUCTURE AND MAPPING

Correlation of GC content with replication timing and repair mechanisms in weakly expressed E.coli genes

Patrick Deschavanne and Jan Filipski*

Laboratoire do Mutagenése, Institut Jacques Monod 2 place Jussieu, Tour 43, 75251 Paris, France

* To whom correspondence should be addressed

Received January 13, 1995. Revised March 10, 1995. Accepted March 10, 1995.

Regional variations of DNA GC content are observed in species as different as S.cerevisiae and humans.In vertebrates and yeast they are correlated with replication timing; late replicating chromosomal regions are more AT-rich than early replicating regions. We show here that gene composition in E.coli also has long range variations which are similarly correlated with replication timing. We suggest that the enrichment in AT base pairs in late replicating DNA reflects differences in DNA repair modes. These sequences, which are in single copy for a greater part of the cell cycle than origin-linked genes, have less opportunity to engage in repair via homologous recombination and therefore may resort more often to translesion synthesis involving the misincorporation of adenine opposite modified nucleotides.


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