Widening the landscape of transcriptional regulation of green algal photoprotection

Marius Arend, Yizhong Yuan, M. Águila Ruiz-Sola, Nooshin Omranian, Zoran Nikoloski () and Dimitris Petroutsos ()
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Marius Arend: University of Potsdam
Yizhong Yuan: University of Grenoble Alpes, CNRS, CEA, INRAE, IRIG-LPCV
M. Águila Ruiz-Sola: University of Grenoble Alpes, CNRS, CEA, INRAE, IRIG-LPCV
Nooshin Omranian: University of Potsdam
Zoran Nikoloski: University of Potsdam
Dimitris Petroutsos: University of Grenoble Alpes, CNRS, CEA, INRAE, IRIG-LPCV

Nature Communications, 2023, vol. 14, issue 1, 1-15

Abstract: Abstract Availability of light and CO2, substrates of microalgae photosynthesis, is frequently far from optimal. Microalgae activate photoprotection under strong light, to prevent oxidative damage, and the CO2 Concentrating Mechanism (CCM) under low CO2, to raise intracellular CO2 levels. The two processes are interconnected; yet, the underlying transcriptional regulators remain largely unknown. Employing a large transcriptomic data compendium of Chlamydomonas reinhardtii’s responses to different light and carbon supply, we reconstruct a consensus genome-scale gene regulatory network from complementary inference approaches and use it to elucidate transcriptional regulators of photoprotection. We show that the CCM regulator LCR1 also controls photoprotection, and that QER7, a Squamosa Binding Protein, suppresses photoprotection- and CCM-gene expression under the control of the blue light photoreceptor Phototropin. By demonstrating the existence of regulatory hubs that channel light- and CO2-mediated signals into a common response, our study provides an accessible resource to dissect gene expression regulation in this microalga.

Date: 2023
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DOI: 10.1038/s41467-023-38183-4

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