Levy, O., Kaniewska, P., Alon, S., Eisenberg, E., Karako-Lampert , S., Bay, L.K., Reef, R., Rodriguez-Lanetty , M., Miller, D.J., and Hoegh-Guldberg, O. (2011) Complex diel cycles of gene expression in coral-algal symbiosis. Science, 331 (6014). p. 175.

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Abstract

Circadian regulation of plant-animal endosymbioses is complicated by a diversity of internal and external cues. Here, we show that stress-related genes in corals are coupled to the circadian clock, anticipating major changes in the intracellular milieu. In this regard, numerous chaperones are "hard-wired" to the clock, effectively preparing the coral for the consequences of oxidative protein damage imposed by symbiont photosynthesis (when O2 > 250% saturation), including synexpression of antioxidant genes being light-gated. Conversely, central metabolism appears to be regulated by the hypoxia-inducible factor system in coral. These results reveal the complexity of endosymbiosis as well as the plasticity regulation downstream of the circadian clock.

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