Role of SeqA and Dam in Escherichia coli gene expression: a global/microarray analysis

UMMS Affiliation

Department of Biochemistry and Molecular Pharmacology

Publication Date


Document Type



Bacterial Outer Membrane Proteins; Chromosomes, Bacterial; DNA Methylation; DNA, Bacterial; DNA-Binding Proteins; Escherichia coli; Escherichia coli Proteins; Gene Expression Regulation, Bacterial; *Genes, Bacterial; Oligonucleotide Array Sequence Analysis; SOS Response (Genetics); Site-Specific DNA-Methyltransferase (Adenine-Specific); Transcription Factors


Biochemistry, Biophysics, and Structural Biology | Pharmacology, Toxicology and Environmental Health


High-density oligonucleotide arrays were used to monitor global transcription patterns in Escherichia coli with various levels of Dam and SeqA proteins. Cells lacking Dam methyltransferase showed a modest increase in transcription of the genes belonging to the SOS regulon. Bacteria devoid of the SeqA protein, which preferentially binds hemimethylated DNA, were found to have a transcriptional profile almost identical to WT bacteria overexpressing Dam methyltransferase. The latter two strains differed from WT in two ways. First, the origin proximal genes were transcribed with increased frequency due to increased gene dosage. Second, chromosomal domains of high transcriptional activity alternate with regions of low activity, and our results indicate that the activity in each domain is modulated in the same way by SeqA deficiency or Dam overproduction. We suggest that the methylation status of the cell is an important factor in forming and/or maintaining chromosome structure.

DOI of Published Version



Proc Natl Acad Sci U S A. 2003 Apr 15;100(8):4672-7. Epub 2003 Apr 7. Link to article on publisher's site

Journal/Book/Conference Title

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

Related Resources

Link to Article in PubMed

PubMed ID