Unknown

Dataset Information

0

BMAL1-Driven Tissue Clocks Respond Independently to Light to Maintain Homeostasis.


ABSTRACT: Circadian rhythms control organismal physiology throughout the day. At the cellular level, clock regulation is established by a self-sustained Bmal1-dependent transcriptional oscillator network. However, it is still unclear how different tissues achieve a synchronized rhythmic physiology. That is, do they respond independently to environmental signals, or require interactions with each other to do so? We show that unexpectedly, light synchronizes the Bmal1-dependent circadian machinery in single tissues in the absence of Bmal1 in all other tissues. Strikingly, light-driven tissue autonomous clocks occur without rhythmic feeding behavior and are lost in constant darkness. Importantly, tissue-autonomous Bmal1 partially sustains homeostasis in otherwise arrhythmic and prematurely aging animals. Our results therefore support a two-branched model for the daily synchronization of tissues: an autonomous response branch, whereby light entrains circadian clocks without any commitment of other Bmal1-dependent clocks, and a memory branch using other Bmal1-dependent clocks to "remember" time in the absence of external cues.

SUBMITTER: Welz PS 

PROVIDER: S-EPMC8157517 | biostudies-literature |

REPOSITORIES: biostudies-literature

Similar Datasets

| S-EPMC4298698 | biostudies-literature
| S-EPMC4793714 | biostudies-literature
| S-EPMC7461627 | biostudies-literature
| S-EPMC8166057 | biostudies-literature
| S-EPMC7068126 | biostudies-literature
| S-EPMC7392222 | biostudies-literature
| S-EPMC8632965 | biostudies-literature
| S-EPMC6526875 | biostudies-literature
| S-EPMC5591335 | biostudies-literature
| S-EPMC6766755 | biostudies-literature