Tiling array study of MNNG treated Escherichia coli reveals a widespread transcriptional response.

Abstract:

:The alkylating agent N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) is known to trigger the adaptive response by inducing the ada-regulon - consisting of three DNA repair enzymes Ada, AlkB, AlkA and the enigmatic AidB. We have applied custom designed tiling arrays to study transcriptional changes in Escherichia coli following a MNNG challenge. Along with the expected upregulation of the adaptive response genes (ada, alkA and alkB), we identified a number of differentially expressed transcripts, both novel and annotated. This indicates a wider regulatory response than previously documented. There were 250 differentially-expressed and 2275 similarly-expressed unannotated transcripts. We found novel upregulation of several stress-induced transcripts, including the SOS inducible genes recN and tisAB, indicating a novel role for these genes in alkylation repair. Furthermore, the ada-regulon A and B boxes were found to be insufficient to explain the regulation of the adaptive response genes after MNNG exposure, suggesting that additional regulatory elements must be involved.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Booth JA,Thomassen GO,Rowe AD,Weel-Sneve R,Lagesen K,Kristiansen KI,Bjørås M,Rognes T,Lindvall JM

doi

10.1038/srep03053

subject

Has Abstract

pub_date

2013-10-25 00:00:00

pages

3053

issn

2045-2322

pii

srep03053

journal_volume

3

pub_type

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