Journal Article

Circadian Rhythms in Rapidly Dividing Cyanobacteria

Aoki, Setsuyuki, Lebedeva, Nadya V., Golden, Susan S., Mori, Tetsuya, Ishiura, Masahiro, Kondo, Takao

1997

Overview

The long-standing supposition that the biological clock cannot function in cells that divide more rapidly than the circadian cycle was investigated. During exponential growth in which the generation time was 10 hours, the profile of bioluminescence from a reporter strain of the cyanobacterium Synechococcus (species PCC 7942) matched a model based on the assumption that cells proliferate exponentially and the bioluminescence of each cell oscillates in a cosine fashion. Some messenger RNAs showed a circadian rhythm in abundance during continuous exponential growth with a doubling time of 5 to 6 hours. Thus, the cyanobacterial circadian clock functions in cells that divide three or more times during one circadian cycle.

• Publisher: American Society for the Advancement of Science,American Association for the Advancement of Science,The American Association for the Advancement of Science
• Subject: Bacteriology / Biological and medical sciences / Biological clocks / Bioluminescence / Cell Division / Cell growth / Cellular biology / Circadian Rhythm / Circadian rhythms / Clocks / Cultured cells / Cyanobacteria / Cyanobacteria - cytology / Cyanobacteria - genetics / Cyanobacteria - growth & development / Cyanobacteria - physiology / Environmental aspects / Freshwater / Fundamental and applied biological sciences. Psychology / Genes, Reporter / Geometric growth / Growth, nutrition, cell differenciation / Liquids / Luciferases - genetics / Luciferases - metabolism / Luminescence / Messenger RNA / Microbiology / Mutation / Photosynthetic Reaction Center Complex Proteins - genetics / Photosystem II Protein Complex / Physiological aspects / RNA, Bacterial - genetics / RNA, Bacterial - metabolism / RNA, Messenger - genetics / RNA, Messenger - metabolism / Synechococcus / Transformation, Bacterial