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Changes in Escherichia coli transcriptome during acclimatization at low temperature.
Alessandra Polissi1, Walter De Laurentis, Sandro Zangrossi
1Department of Microbiology, Glaxo Wellcome SpA, Verona, Italy.
Research in Microbiology
|October 7, 2003
Summary
Escherichia coli adapts to cold shock by altering gene expression. Polynucleotide phosphorylase (PNPase) plays a complex role in this cold adaptation, influencing the abundance of various transcripts.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Cold shock triggers growth arrest and acclimatization in Escherichia coli.
- Cold temperatures impact membrane fluidity and nucleic acid structures, affecting gene expression.
- Specific proteins, including Polynucleotide phosphorylase (PNPase), are induced during cold acclimatization.
Purpose of the Study:
- To investigate global mRNA abundance changes during cold adaptation in wild-type E. coli and a PNPase-deficient mutant.
- To understand the role of PNPase in the cold shock response and acclimatization process.
Main Methods:
- Comparative transcriptomic analysis of wild-type E. coli MG1655 and a PNPase-deficient mutant under cold shock conditions.
- Quantification of relative mRNA abundance for various genes using high-throughput sequencing.
Main Results:
- Cold shock induced significant changes (twofold or greater variation) in the mRNA abundance of 20 genes.
- Cold-induced genes included csp genes, extracytoplasmic stress regulators (rpoE, rseA), and eight genes with unknown functions.
- PNPase was found to both positively and negatively modulate the transcript abundance of specific cold-responsive genes.
Conclusions:
- PNPase has a complex regulatory role in E. coli's cold adaptation, influencing multiple aspects of gene expression.
- The study identified novel genes involved in the cold shock response, expanding our understanding of bacterial adaptation mechanisms.