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Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Osmolarity is the measure of solute concentration in a solution. It plays a critical role in determining water availability for organisms. Water moves across semipermeable membranes through osmosis, flowing from regions of lower solute concentration (more dilute) to regions of higher solute concentration (more concentrated).In high-solute environments, microbial cells lose water, leading to dehydration and inhibited growth. The extent to which water is available to microbes in such environments...
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The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Low salinity activates a virulence program in the generalist marine pathogen Photobacterium damselae subsp. damselae.

Alba V Barca1, Ana Vences1, Mateus S Terceti1

  • 1Departamento de Microbioloxía e Parasitoloxía, Instituto de Acuicultura, Universidade de Santiago de Compostela , Santiago de Compostela, Spain.

Msystems
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Marine bacteria like Photobacterium damselae subsp. damselae alter gene expression based on salt levels. Low salt (1% NaCl) activates virulence factors, while high salt (3% NaCl) boosts metabolism and antibiotic resistance.

Keywords:
NaClPhotobacterium damselaearginine deiminasedamselysinhemolysinsalinitysecretometranscriptomevirulence

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Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Environmental Microbiology

Background:

  • Facultative marine bacterial pathogens modulate virulence factor expression in response to environmental cues.
  • NaCl concentration is a critical environmental signal influencing bacterial lifestyles and pathogenicity.

Purpose of the Study:

  • To investigate the transcriptional response of Photobacterium damselae subsp. damselae to varying NaCl concentrations.
  • To identify genes and pathways regulated by salinity changes in this generalist marine pathogen.

Main Methods:

  • Transcriptome sequencing (RNA-Seq) was employed to compare gene expression profiles.
  • Bacterial growth was conducted at two distinct NaCl concentrations (1% and 3%) mimicking host and free-living environments.

Main Results:

  • A total of 1,808 differentially expressed genes were identified between low-salt (1% NaCl) and high-salt (3% NaCl) conditions.
  • Low salinity (1% NaCl) upregulated virulence-associated genes, including type 2 secretion system (T2SS)-dependent toxins and iron acquisition systems.
  • High salinity (3% NaCl) upregulated genes involved in metabolism, energy production, and antibiotic resistance, including the arginine deiminase system (ADS).

Conclusions:

  • NaCl concentration acts as a major regulatory signal for Photobacterium damselae subsp. damselae, dictating a switch between metabolic and virulence-focused gene expression programs.
  • The study reveals a salinity-driven virulence program triggered by decreased NaCl, crucial for host invasion and nutrient acquisition.
  • Findings enhance understanding of salinity-responsive adaptations in marine pathogens and inform future research on Vibrionaceae family pathobiology.