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Updated: Apr 1, 2026

A Fast and Reliable Pipeline for Bacterial Transcriptome Analysis Case study: Serine-dependent Gene Regulation in Streptococcus pneumoniae
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Interactions between closely related bacterial strains are revealed by deep transcriptome sequencing.

Pedro González-Torres1, Leszek P Pryszcz2, Fernando Santos1

  • 1Department of Physiology, Genetics, and Microbiology, University of Alicante, Alicante, Spain.

Applied and Environmental Microbiology
|October 4, 2015
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Summary

Microbial communities are complex. This study shows that closely related bacterial strains, Salinibacter ruber, modify gene expression when grown together, indicating specific responses rather than simple additive effects.

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Area of Science:

  • Microbiology
  • Genomics
  • Transcriptomics

Background:

  • Microbial populations consist of closely related strains.
  • It is unclear if these strains modify gene expression in response to relatives or act additively.

Purpose of the Study:

  • To investigate if bacterial strains alter gene expression when co-cultured.
  • To understand intraspecific interactions in microbial assemblages.

Main Methods:

  • Transcriptome sequencing of two closely related Salinibacter ruber strains.
  • Axenic and co-culture growth experiments.
  • Comparative analysis of gene expression patterns.

Main Results:

  • Transcriptomic patterns were similar between strains in pure culture.
  • Highly expressed genes included xanthorhodopsin, stress response, and transcriptional regulators.
  • Co-culturing led to modest but significant changes in individual strain transcription patterns.
  • Differences primarily affected genes involved in environmental sensing.

Conclusions:

  • Bacterial strains sense the presence of close relatives.
  • Intraspecific interactions lead to specific transcriptomic modulation.
  • Microbial assemblages are not merely arithmetic sums of individual strains.