Circadian G2 Arrest as Related to Circadian Gating of Cell Population Growth in Euglena | Zendy

Aoen Bolige | Zendy; Shinya Hagiwara | Zendy; Yulan Zhang | Zendy; Ken Goto | Zendy

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Circadian G2 Arrest as Related to Circadian Gating of Cell Population Growth in Euglena

Author(s) -

Aoen Bolige,

Shinya Hagiwara,

Yulan Zhang,

Ken Goto

Publication year - 2005

Publication title -

plant and cell physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.975

H-Index - 152

eISSN - 1471-9053

pISSN - 0032-0781

DOI - 10.1093/pcp/pci100

Subject(s) - circadian rhythm , flagellate , biology , euglena gracilis , bacterial circadian rhythms , euglena , population , circadian clock , mitosis , phase response curve , microbiology and biotechnology , cell division , cell , botany , genetics , neuroscience , chloroplast , medicine , gene , environmental health

Cell population growth is gated to occur in particular circadian phases, which has been known for over four decades in various organisms including cyanobacteria and human. However, little is known as to which cell cycle phases from G1 to M are primarily regulated by the circadian rhythm or when in a circadian cycle this primary regulation takes place. We report here that in the flagellate alga Euglena gracilis grown photoautotrophically, the circadian rhythm primarily prevented developmentally matured G2 cells from progressing to mitosis, such that cell population growth occurred only during subjective night. In addition, we found that the circadian rhythm also arrests G1-to-S and S-to-G2 transitions at particular circadian phases.

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