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Titolo:
THE CIRCADIAN PROGRAM OF ALGAE
Autore:
ROENNEBERG T; MITTAG M;
Indirizzi:
INST MED PSYCHOL,GOETHESTR 31 D-80336 MUNICH GERMANY LMU,INST BOT D-80638 MUNICH GERMANY
Titolo Testata:
SEMINARS IN CELL & DEVELOPMENTAL BIOLOGY
fascicolo: 6, volume: 7, anno: 1996,
pagine: 753 - 763
SICI:
1084-9521(1996)7:6<753:TCPOA>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
DINOFLAGELLATE GONYAULAX-POLYEDRA; LUCIFERIN-BINDING-PROTEIN; FAST-FREEZE FIXATION; GENE-EXPRESSION; MESSENGER-RNA; UNICELLULAR ALGA; PHOTOSYNTHETIC APPARATUS; NEUROSPORA-CRASSA; PHOTOTAXIS RHYTHM; PHASE RESPONSES;
Keywords:
CELL BIOLOGY; CIRCADIAN GENE EXPRESSION; TEMPORAL ECOLOGY;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
144
Recensione:
Indirizzi per estratti:
Citazione:
T. Roenneberg e M. Mittag, "THE CIRCADIAN PROGRAM OF ALGAE", SEMINARS IN CELL & DEVELOPMENTAL BIOLOGY, 7(6), 1996, pp. 753-763

Abstract

The endogenous circadian program enables organisms to cope with the temporal ecology of their environment. It is driven by a molecular pacemaker, which is found in animals as well as plants at the level of thesingle cell. Unicellular organisms are, therefore, ideal model systems for the study of circadian systems because rhythms can be investigated in single cells at the molecular physiological, behavioral and environmental level. In this review, we discuss the possible driving forces for the evolution of circadian rhythmicity in unicellular marine organisms. The current knowledge about the cellular and molecular mechanisms involved in the different components of the circadian system (input, oscillator and output) are described primarily with reference to the marine dinoflagellate, Gonyaulax polyedra. Light is the most important and best described environmental signal synchronizing the endogenous rhythms to the 24-hour solar day. However, little is known about thenature of circadian light receptors, which appear to be distinct fromthose that control behavioral light responses such as phototaxis. It has recently been shown in Gonyaulax that nutrients, namely nitrate, can act as a non-photic zeitgeber for the circadian system. In this alga, bioluminescence is under circadian control, and the molecular mechanisms of this circadian output have been investigated in detail. The circadian program turns out to be more complex than simply consisting of an input pathway, a pacemaker and the driven rhythms. Different rhythms appear to be controlled by separate pacemakers, even in single cells, and both circadian inputs and outputs contain feedback loops. The functional advantages of this complexity are discussed. Finally, we outline the differences between the circadian program under laboratory and natural conditions. (C) 1996 Academic Press Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 02:23:40