Affiliation:
1. Department of Veterinary Pathobiology, College of Veterinary Medicine, Oklahoma State University, Stillwater, Oklahoma 74078
Abstract
ABSTRACT
The foodborne pathogen
Campylobacter jejuni
is the primary causative agent of gastroenteritis in humans. In the present study a whole genome microarray of
C. jejuni
was constructed and validated. These DNA microarrays were used to measure changes in transcription levels over time, as
C. jejuni
cells responded to a temperature increase from 37 to 42°C. Approximately 20% of the
C. jejuni
genes were significantly up- or downregulated over a 50-min period after the temperature increase. The global change in
C. jejuni
transcriptome was found to be essentially transient, with only a small subset of genes still differentially expressed after 50 min. A substantial number of genes with a downregulated coexpression pattern were found to encode for ribosomal proteins. This suggests a short growth arrest upon temperature stress, allowing the bacteria to reshuffle their energy toward survival and adaptation to the new growth temperature. Genes encoding chaperones, chaperonins, and heat shock proteins displayed the most dramatic and rapid upregulation immediately after the temperature change. Interestingly, genes encoding proteins involved in membrane structure modification were differentially expressed, either up- or downregulated, suggesting a different protein membrane makeup at the two different growth temperatures. Overall, these data provide new insights into the primary response of
C. jejuni
to surmount a sudden temperature upshift, allowing the bacterium to survive and adapt its transcriptome to a new steady state.
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
Cited by
192 articles.
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