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James M Fleckenstein1, Jacob P Bitoun2

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Bats possess a unique evolutionary adaptation allowing them to tolerate bacterial heat-stable enterotoxins (ST). This prevents ST from causing diarrhea by maintaining normal fluid homeostasis, unlike in other species.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Physiology

Background:

  • Endogenous peptides and bacterial heat-stable enterotoxins (ST) interact with guanylate cyclase-C (GC-C).
  • This interaction typically leads to either fluid homeostasis or diarrhea, depending on the specific agent.
  • Understanding these interactions is crucial for deciphering host-microbe dynamics.

Purpose of the Study:

  • To investigate the evolutionary mechanisms by which bats maintain fluid homeostasis despite exposure to ST.
  • To elucidate how bats avoid the pathogenic effects of ST.

Main Methods:

  • Comparative genomics analysis.
  • Molecular pathway investigation.
  • Physiological response assessment in bat models.

Main Results:

  • Bats exhibit a distinct evolutionary trajectory in their GC-C signaling pathway.
  • Specific adaptations in bats prevent ST from triggering the diarrheal response.
  • Homeostatic signaling is preserved in bats, even with ST presence.

Conclusions:

  • Bats have evolved a sophisticated defense against ST, ensuring gut health.
  • This study reveals a novel host-pathogen interaction strategy in bats.
  • Findings offer insights into potential therapeutic targets for enterotoxin-induced conditions.