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Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
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Sensory deprivation in Staphylococcus aureus.

Maite Villanueva1, Begoña García1,2, Jaione Valle1,2

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Bacteria can survive without most two-component systems (TCSs), which sense environmental changes. The WalRK TCS is essential for growth in Staphylococcus aureus, but other TCSs are dispensable under constant conditions.

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Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Molecular Biology

Background:

  • Bacteria utilize two-component systems (TCSs) for sensing and responding to environmental stimuli.
  • Staphylococcus aureus, a major human pathogen, possesses 16 core-encoded TCSs, with WalRK being essential.

Purpose of the Study:

  • To investigate the necessity and sufficiency of the TCS network in Staphylococcus aureus under different growth conditions.
  • To characterize the functional autonomy and potential cross-regulation of individual TCSs.

Main Methods:

  • Generating and analyzing Staphylococcus aureus mutants lacking the complete TCS network or individual TCSs.
  • Assessing bacterial survival and growth under both growth arrest and replicating conditions.
  • Investigating cross-regulation between non-cognate sensor-response regulator pairs in vivo.

Main Results:

  • Staphylococcus aureus can survive without its complete TCS network under growth arrest conditions.
  • The WalRK TCS is essential and sufficient for maintaining bacterial growth under replicating conditions.
  • Individual TCSs function autonomously in sensing specific environmental cues, with limited cross-regulation observed.

Conclusions:

  • The bacterial TCS network is largely dispensable for survival under constant environmental conditions, with specific TCSs like WalRK being crucial for growth.
  • The modular organization of TCSs suggests a general evolutionary mechanism for bacterial adaptation to new environments.