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Asymmetric Osmoadaptive Responses in Intermediate-Salinity Microbial Communities Revealed by Metatranscriptomics.

Salvador Mirete1, María Lamprecht-Grandío1, Carolina González de Figueras1

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Summary

Microbial communities in salty environments adapt to rapid salinity changes. Increased salinity triggers stress responses, while dilution promotes metabolic recovery, revealing dynamic osmoadaptation strategies.

Keywords:
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Area of Science:

  • Microbiology
  • Environmental Science
  • Molecular Biology

Background:

  • Salinity is a key factor influencing microbial life in hypersaline ecosystems.
  • Understanding microbial responses to salinity fluctuations is crucial for comprehending ecosystem dynamics.

Purpose of the Study:

  • To investigate the transcriptional responses of microbial communities to rapid salinity changes.
  • To characterize the osmoadaptive mechanisms employed by microbes in intermediate-salinity environments.

Main Methods:

  • Metatranscriptomic analysis of brine samples from Santa Pola solar salterns.
  • Experimental manipulation of salinity: increase (12.4% to 17%) and dilution (12.4% to 7%).
  • Analysis of differential gene expression, functional enrichment, and protein isoelectric point (pI) distributions.

Main Results:

  • Salinity increase induced stress responses: upregulation of compatible solute biosynthesis (e.g., ectoine), protein turnover, and chaperones; repression of translation and energy metabolism.
  • Salinity dilution promoted metabolic reactivation: enhanced translation, energy production, and osmolyte degradation.
  • Increased salinity shifted proteome properties towards higher pI proteins, indicating salt-out strategies.

Conclusions:

  • Microbial communities exhibit dynamic and asymmetric transcriptional plasticity in response to salinity shifts.
  • Osmotic upshift imposes greater constraints than downshift, driving metabolic reprogramming and proteome restructuring.
  • These findings provide insights into microbial adaptation strategies in fluctuating hypersaline environments.