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Title: Identification of circadian rhythms in Nannochloropsis species using bioluminescence reporter lines

Abstract

Circadian clocks allow organisms to predict environmental changes caused by the rotation of the Earth. Although circadian rhythms are widespread among different taxa, the core components of circadian oscillators are not conserved and differ between bacteria, plants, animals and fungi. Stramenopiles are a large group of organisms in which circadian rhythms have been only poorly characterized and no clock components have been identified. In this work, we have investigated cell division and molecular rhythms in Nannochloropsis species. In the four strains tested, cell division occurred principally during the night period under diel conditions; however, these rhythms damped within 2–3 days after transfer to constant light. We developed firefly luciferase reporters for the long-term monitoring of in vivo transcriptional rhythms in two Nannochlropsis species, Nannochloropsis oceanica CCMP1779 and Nannochloropsis salina CCMP537. The reporter lines express anticipatory behavior under light/dark cycles and free-running bioluminescence rhythms with periods of ~21–31 h that damped within ~3–4 days under constant light. Using different entrainment regimes, we demonstrate that these rhythms are modulated by a circadian-type oscillator. In addition, the phase of free-running luminescence rhythms can be modulated pharmacologically using a CK1 ε/δ inhibitor, suggesting a role of this kinase in the Nannochloropsis clock. Finally, togethermore » with the molecular and genomic tools available for Nannochloropsis species, these reporter lines represent an excellent system for future studies on the molecular mechanisms of stramenopile circadian oscillators.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [1]
  1. Michigan State Univ., East Lansing, MI (United States)
Publication Date:
Research Org.:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1603781
Grant/Contract Number:  
FG02-91ER20021
Resource Type:
Accepted Manuscript
Journal Name:
The Plant Journal
Additional Journal Information:
Journal Volume: 99; Journal Issue: 1; Journal ID: ISSN 0960-7412
Publisher:
Society for Experimental Biology
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 54 ENVIRONMENTAL SCIENCES; circadian rhythms; stramenopiles; luciferase; transcription; cell division; bioluminescence reporter; Nannochloropsis oceanica; Nannochloropsis salina; Nannochloropsis genus

Citation Formats

Poliner, Eric, Cummings, Cameron, Newton, Linsey, and Farré, Eva M. Identification of circadian rhythms in Nannochloropsis species using bioluminescence reporter lines. United States: N. p., 2019. Web. doi:10.1111/tpj.14314.
Poliner, Eric, Cummings, Cameron, Newton, Linsey, & Farré, Eva M. Identification of circadian rhythms in Nannochloropsis species using bioluminescence reporter lines. United States. https://doi.org/10.1111/tpj.14314
Poliner, Eric, Cummings, Cameron, Newton, Linsey, and Farré, Eva M. Fri . "Identification of circadian rhythms in Nannochloropsis species using bioluminescence reporter lines". United States. https://doi.org/10.1111/tpj.14314. https://www.osti.gov/servlets/purl/1603781.
@article{osti_1603781,
title = {Identification of circadian rhythms in Nannochloropsis species using bioluminescence reporter lines},
author = {Poliner, Eric and Cummings, Cameron and Newton, Linsey and Farré, Eva M.},
abstractNote = {Circadian clocks allow organisms to predict environmental changes caused by the rotation of the Earth. Although circadian rhythms are widespread among different taxa, the core components of circadian oscillators are not conserved and differ between bacteria, plants, animals and fungi. Stramenopiles are a large group of organisms in which circadian rhythms have been only poorly characterized and no clock components have been identified. In this work, we have investigated cell division and molecular rhythms in Nannochloropsis species. In the four strains tested, cell division occurred principally during the night period under diel conditions; however, these rhythms damped within 2–3 days after transfer to constant light. We developed firefly luciferase reporters for the long-term monitoring of in vivo transcriptional rhythms in two Nannochlropsis species, Nannochloropsis oceanica CCMP1779 and Nannochloropsis salina CCMP537. The reporter lines express anticipatory behavior under light/dark cycles and free-running bioluminescence rhythms with periods of ~21–31 h that damped within ~3–4 days under constant light. Using different entrainment regimes, we demonstrate that these rhythms are modulated by a circadian-type oscillator. In addition, the phase of free-running luminescence rhythms can be modulated pharmacologically using a CK1 ε/δ inhibitor, suggesting a role of this kinase in the Nannochloropsis clock. Finally, together with the molecular and genomic tools available for Nannochloropsis species, these reporter lines represent an excellent system for future studies on the molecular mechanisms of stramenopile circadian oscillators.},
doi = {10.1111/tpj.14314},
journal = {The Plant Journal},
number = 1,
volume = 99,
place = {United States},
year = {Fri Apr 19 00:00:00 EDT 2019},
month = {Fri Apr 19 00:00:00 EDT 2019}
}

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