Day/Night Separation of Oxygenic Energy Metabolism and Nuclear DNA Replication in the Unicellular Red Alga Cyanidioschyzon merolae

Shin Ya Miyagishima, Atsuko Era, Tomohisa Hasunuma, Mami Matsuda, Shunsuke Hirooka, Nobuko Sumiya, Akihiko Kondo, Takayuki Fujiwara

Research output: Contribution to journalArticle

Abstract

The transition from G1 to S phase and subsequent nuclear DNA replication in the cells of many species of eukaryotic algae occur predominantly during the evening and night in the absence of photosynthesis; however, little is known about how day/night changes in energy metabolism and cell cycle progression are coordinated and about the advantage conferred by the restriction of S phase to the night. Using a synchronous culture of the unicellular red alga Cyanidioschyzon merolae, we found that the levels of photosynthetic and respiratory activities peak during the morning and then decrease toward the evening and night, whereas the pathways for anaerobic consumption of pyruvate, produced by glycolysis, are upregulated during the evening and night as reported recently in the green alga Chlamydomonas reinhardtii Inhibition of photosynthesis by 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) largely reduced respiratory activity and the amplitude of the day/night rhythm of respiration, suggesting that the respiratory rhythm depends largely on photosynthetic activity. Even when the timing of G1/S-phase transition was uncoupled from the day/night rhythm by depletion of retinoblastoma-related (RBR) protein, the same patterns of photosynthesis and respiration were observed, suggesting that cell cycle progression and energy metabolism are regulated independently. Progression of the S phase under conditions of photosynthesis elevated the frequency of nuclear DNA double-strand breaks (DSB). These results suggest that the temporal separation of oxygenic energy metabolism, which causes oxidative stress, from nuclear DNA replication reduces the risk of DSB during cell proliferation in C. merolaeIMPORTANCE Eukaryotes acquired chloroplasts through an endosymbiotic event in which a cyanobacterium or a unicellular eukaryotic alga was integrated into a previously nonphotosynthetic eukaryotic cell. Photosynthesis by chloroplasts enabled algae to expand their habitats and led to further evolution of land plants. However, photosynthesis causes greater oxidative stress than mitochondrion-based respiration. In seed plants, cell division is restricted to nonphotosynthetic meristematic tissues and populations of photosynthetic cells expand without cell division. Thus, seemingly, photosynthesis is spatially sequestrated from cell proliferation. In contrast, eukaryotic algae possess photosynthetic chloroplasts throughout their life cycle. Here we show that oxygenic energy conversion (daytime) and nuclear DNA replication (night time) are temporally sequestrated in C. merolae This sequestration enables "safe" proliferation of cells and allows coexistence of chloroplasts and the eukaryotic host cell, as shown in yeast, where mitochondrial respiration and nuclear DNA replication are temporally sequestrated to reduce the mutation rate.

Original languageEnglish
JournalmBio
Volume10
Issue number4
DOIs
Publication statusPublished - 2019 Jul 2

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Rhodophyta
Photosynthesis
DNA Replication
Energy Metabolism
Chloroplasts
S Phase
Respiration
Diuron
Cell Proliferation
Eukaryotic Cells
Cell Division
Cell Cycle
Oxidative Stress
Embryophyta
Chlamydomonas reinhardtii
Retinoblastoma Protein
Chlorophyta
Double-Stranded DNA Breaks
Phase Transition
G1 Phase

Keywords

  • cell cycle
  • Cyanidioschyzon merolae
  • endosymbiosis
  • photosynthetic oxidative stress

ASJC Scopus subject areas

  • Microbiology
  • Virology

Cite this

Day/Night Separation of Oxygenic Energy Metabolism and Nuclear DNA Replication in the Unicellular Red Alga Cyanidioschyzon merolae. / Miyagishima, Shin Ya; Era, Atsuko; Hasunuma, Tomohisa; Matsuda, Mami; Hirooka, Shunsuke; Sumiya, Nobuko; Kondo, Akihiko; Fujiwara, Takayuki.

In: mBio, Vol. 10, No. 4, 02.07.2019.

Research output: Contribution to journalArticle

Miyagishima, Shin Ya ; Era, Atsuko ; Hasunuma, Tomohisa ; Matsuda, Mami ; Hirooka, Shunsuke ; Sumiya, Nobuko ; Kondo, Akihiko ; Fujiwara, Takayuki. / Day/Night Separation of Oxygenic Energy Metabolism and Nuclear DNA Replication in the Unicellular Red Alga Cyanidioschyzon merolae. In: mBio. 2019 ; Vol. 10, No. 4.
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