Abstract
The gastrointestinal bacterium Klebsiella (née Enterobacter) aerogenes expresses an endogenously generated, temperature-compensated circadian rhythm in swarming motility. We hypothesized that this rhythm may be synchronized/entrained in vivo by body temperature (TB). To determine entrainment, cultures expressing bioluminescence were exposed to temperature cycles of 1°C (35°C–36°C) or 3°C (34°C–37°C) in amplitude at periods (T-cycles) of T = 22, T = 24, or T = 28 h. Bacteria entrained to all T-cycles at both amplitudes and with stable phase relationships. A high-amplitude phase response curve (PRC) in response to 1-h pulses of 3°C temperature spike (34°C–37°C) at different circadian phases was constructed, revealing a Type-0 phase resetting paradigm. Furthermore, real-time bioluminescence imaging revealed a spatiotemporal pattern to the circadian rhythm. These data are consistent with the hypothesis that the K. aerogenes circadian clock entrains to its host via detection of and phase shifting to the daily pattern of TB.
Original language | English |
---|---|
Pages (from-to) | 1202-1213 |
Number of pages | 12 |
Journal | iScience |
Volume | 19 |
DOIs | |
State | Published - Sep 27 2019 |
Bibliographical note
Funding Information:The Cassone lab is supported by NIH R01 GM118541 , HHMI Sustaining Excellence Award 52008116, and KSEF-3783-020 . The authors would like to thank Clifford Harpole for helpful discussion during the course of this research.
Publisher Copyright:
© 2019 The Author(s)
Keywords
- Biological Sciences
- Chronobiology
- Microbiology
ASJC Scopus subject areas
- General