Endogenous Circadian Rhythm in Cytoplasm of
            <i>Acetabularia</i>
            : Influence of the Nucleus

Schweiger, E.; Wallraff, Hans Georg; Schweiger, Hans−Georg

doi:10.1126/science.146.3644.658

Cited by 87 publications

(33 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their research described circadian rhythms of photosynthetic output and chloroplast migration; they and other groups found that the timekeeping mechanism resided in the nucleus of the cell (33,34) . Others however have argued that the nucleus has no role in the generation of circadian rhythms as rhythms of photosynthesis persisted in enucleated cells, but that the nucleus may communicate phase information (27) .…”

Section: Acetabularia Sppmentioning

confidence: 97%

Clocks in Algae

Noordally

Millar

2014

Biochemistry

View full text Add to dashboard Cite

As major contributors to global oxygen levels and producers of fatty acids, carotenoids, sterols, and phycocolloids, algae have significant ecological and commercial roles. Early algal models have contributed much to our understanding of circadian clocks at physiological and biochemical levels. The genetic and molecular approaches that identified clock components in other taxa have not been as widely applied to algae. We review results from seven species: the chlorophytes Chlamydomonas reinhardtii, Ostreococcus tauri, and Acetabularia spp.; the dinoflagellates Lingulodinium polyedrum and Symbiodinium spp.; the euglenozoa Euglena gracilis; and the red alga Cyanidioschyzon merolae. The relative simplicity, experimental tractability, and ecological and evolutionary diversity of algal systems may now make them particularly useful in integrating quantitative data from "omic" technologies (e.g., genomics, transcriptomics, metabolomics, and proteomics) with computational and mathematical methods.

show abstract

Section: Acetabularia Sppmentioning

confidence: 97%

Clocks in Algae

Noordally

Millar

2014

Biochemistry

View full text Add to dashboard Cite

show abstract

“…However, it is unclear to what extent the nucleus contributes to circadian rhythmicity of the chloroplast in these species. On the other hand, it has been known that in the green macroalga Acetabularia, the chloroplast photosynthetic rhythm persists even in an enucleated cell (46), and the nucleus contributes only to phase determination of the rhythm (41).…”

mentioning

confidence: 99%

Real-Time Monitoring of Chloroplast Gene Expression by a Luciferase Reporter: Evidence for Nuclear Regulation of Chloroplast Circadian Period

Matsuo

Onai

Okamoto

et al. 2006

Molecular and Cellular Biology

View full text Add to dashboard Cite

Chloroplast-encoded genes, like nucleus-encoded genes, exhibit circadian expression. How the circadian clock exerts its control over chloroplast gene expression, however, is poorly understood. To facilitate the study of chloroplast circadian gene expression, we developed a codon-optimized firefly luciferase gene for the chloroplast of Chlamydomonas reinhardtii as a real-time bioluminescence reporter and introduced it into the chloroplast genome. The bioluminescence of the reporter strain correlated well with the circadian expression pattern of the introduced gene and satisfied all three criteria for circadian rhythms. Moreover, the period of the rhythm was lengthened in per mutants, which are phototactic rhythm mutants carrying a long-period gene in their nuclear genome. These results demonstrate that chloroplast gene expression rhythm is a bona fide circadian rhythm and that the nucleus-encoded circadian oscillator determines the period length of the chloroplast rhythm. Our reporter strains can serve as a powerful tool not only for analysis of the circadian regulation mechanisms of chloroplast gene expression but also for a genetic approach to the molecular oscillator of the algal circadian clock.

show abstract

“…Finally, we recall the puzzling example of Acetabularia, the giant unicellular algae that shows a self-sustained circadian rhythm even if the nucleus has been "surgically" removed (Schweiger et al 1964). The dissociation of Chlamydomonas nuclear and chroloplast rhythms shown in the work here suggests that the circadian system of this microscopic algae is constructed similarly to Acetabularia.…”

Section: The Chlamydomonas Clock In Contextmentioning

confidence: 75%

The green yeast uses its plant-like clock to regulate its animal-like tail: Figure 1.

Brunner¹,

Merrow²

2008

Genes Dev.

View full text Add to dashboard Cite

Endogenous Circadian Rhythm in Cytoplasm of Acetabularia : Influence of the Nucleus

Abstract: It was shown by three different methods that in the unicellular and uninuclear green alga Acetabularia the nucleus is capable of determining the phase of the circadian rhythm of the oxygen balance in the cytoplasm.

Cited by 87 publications

References 3 publications

Clocks in Algae

Clocks in Algae

Real-Time Monitoring of Chloroplast Gene Expression by a Luciferase Reporter: Evidence for Nuclear Regulation of Chloroplast Circadian Period

The green yeast uses its plant-like clock to regulate its animal-like tail: Figure 1.

Contact Info

Product

Resources

About