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Distinct roles for two Caenorhabditis elegans acid-sensing ion channels in an ultradian clock.


ABSTRACT: Biological clocks are fundamental to an organism's health, controlling periodicity of behaviour and metabolism. Here, we identify two acid-sensing ion channels, with very different proton sensing properties, and describe their role in an ultradian clock, the defecation motor program (DMP) of the nematode Caenorhabditis elegans. An ACD-5-containing channel, on the apical membrane of the intestinal epithelium, is essential for maintenance of luminal acidity, and thus the rhythmic oscillations in lumen pH. In contrast, the second channel, composed of FLR-1, ACD-3 and/or DEL-5, located on the basolateral membrane, controls the intracellular Ca2+ wave and forms a core component of the master oscillator that controls the timing and rhythmicity of the DMP. flr-1 and acd-3/del-5 mutants show severe developmental and metabolic defects. We thus directly link the proton-sensing properties of these channels to their physiological roles in pH regulation and Ca2+ signalling, the generation of an ultradian oscillator, and its metabolic consequences.

SUBMITTER: Kaulich E 

PROVIDER: S-EPMC9374441 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature

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Distinct roles for two <i>Caenorhabditis elegans</i> acid-sensing ion channels in an ultradian clock.

Kaulich Eva E   Carroll Trae T   Ackley Brian D BD   Tang Yi-Quan YQ   Hardege Iris I   Nehrke Keith K   Schafer William R WR   Walker Denise S DS  

eLife 20220606


Biological clocks are fundamental to an organism's health, controlling periodicity of behaviour and metabolism. Here, we identify two acid-sensing ion channels, with very different proton sensing properties, and describe their role in an ultradian clock, the defecation motor program (DMP) of the nematode <i>Caenorhabditis elegans</i>. An ACD-5-containing channel, on the apical membrane of the intestinal epithelium, is essential for maintenance of luminal acidity, and thus the rhythmic oscillatio  ...[more]

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