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Acid-induced gene expression in Helicobacter pylori: study in genomic scale by microarray
1Graduate Institute of Microbiology, National Taiwan University College of Medicine, Taipei, Taiwan.
Infection and Immunity
|February 17, 2001
Summary
Helicobacter pylori alters gene expression under acid stress. Microarray analysis revealed significant changes in RNA expression for 80 open reading frames (ORFs) at low pH, aiding in understanding bacterial adaptation.
Area of Science:
- Microbiology
- Molecular Biology
- Genomics
Background:
- Helicobacter pylori is a significant human pathogen.
- Understanding its response to environmental stress, like acid stress, is crucial for developing effective treatments.
- Gene expression analysis provides insights into bacterial adaptation mechanisms.
Purpose of the Study:
- To investigate the genome-wide RNA expression profile of Helicobacter pylori under acid stress conditions.
- To identify specific genes and pathways involved in the acid stress response of H. pylori.
Main Methods:
- Utilized a microarray containing 1,534 open reading frames (ORFs) from H. pylori strain 26695.
- Extracted total RNA from H. pylori grown at pH 7.2 and pH 5.5.
- Hybridized labeled cDNA probes to the microarray and measured gene expression using densitometry.
Main Results:
- Identified 53 highly expressed ORFs and 445 stably expressed ORFs under both pH conditions.
- Observed significantly increased expression in 80 ORFs and suppressed expression in 4 ORFs at low pH (acid stress).
- Demonstrated high reproducibility and comparability with the RNA slot blot method.
Conclusions:
- Microarray technology is a viable tool for monitoring prokaryotic gene expression on a genomic scale.
- The study identified key genes involved in H. pylori's adaptation to acidic environments.
- These findings contribute to a better understanding of H. pylori pathogenesis and survival mechanisms.