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Differential transcriptomic analysis reveals hidden light response in Streptomyces lividans.

Joachim Koepff1, Holger Morschett1, Tobias Busche2

  • 1Inst. of Bio- and Geosciences, IBG-1: Biotechnology, Jülich, Germany.

Biotechnology Progress
|September 30, 2017
PubMed
Summary

Environmental factors like light can trigger metabolic adaptation in Streptomyces lividans during bioprocess development. Careful control is essential to avoid misinterpreting omics data and ensure accurate bioprocess comparisons.

Keywords:
Photo BioLectorStreptomyces lividanshigh-throughput bioprocess developmentlight responseminiaturized cultivationparallelized cultivationtranscriptomic analysis

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Area of Science:

  • Biotechnology
  • Microbial Physiology
  • Metabolic Engineering

Background:

  • Streptomyces lividans is a key source of pharmaceutical compounds.
  • Upstream process development was accelerated using microtiter plates and scaled to bioreactors.
  • Transcriptomic analysis revealed light-responsive gene upregulation during bioreactor cultivation.

Purpose of the Study:

  • To investigate the specific influence of light on Streptomyces lividans cultivation.
  • To understand the metabolic and transcriptomic responses to defined light conditions.
  • To assess the impact of light on overall process performance and identify potential misinterpretations in omics studies.

Main Methods:

  • Parallelized cultivation of Streptomyces lividans in microtiter plates.
  • Controlled illumination experiments comparing dark and light conditions.
  • Transcriptomic analysis (RNA sequencing) to identify gene expression changes.

Main Results:

  • Identical growth performance was observed between dark and illuminated cultures.
  • Upregulation of seven genes, including six involved in carotenoid synthesis and one encoding a DNA photo-lyase.
  • Carotenoids act as reactive oxygen species quenchers, and photo-lyase aids in DNA repair, indicating a light response.
  • Metabolic adaptation compensated for these changes, maintaining overall process performance.

Conclusions:

  • Defined illumination does not significantly impact Streptomyces lividans growth performance.
  • The bacterium exhibits a light-induced response involving carotenoid synthesis and DNA repair mechanisms.
  • Metabolic adaptation effectively compensates for light-induced transcriptomic changes, preserving process performance.
  • Strict control and evaluation of environmental conditions are crucial for accurate omics data interpretation in bioprocess development.