| Entrainment elicits period aftereffects in Neurospora crassa. | |
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MedLine Citation:
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PMID: 20795879 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Circadian clocks continue to oscillate in constant conditions with their own period (tau) and entrain to a cyclic environment by adjusting their intrinsic period to that of the zeitgeber. When circadian clocks are released from entrained to constant conditions, the tau of their initial free-run often depends on the nature of the prior zeitgeber. These postentrainment effects on period (tau-aftereffects) have predominantly been reported for animals but, so far, not fungi. The authors therefore investigated tau aftereffects in the classic circadian model system Neurospora crassa. The standard laboratory strain frq+, the short-period mutant frq(1), and the long-period mutant frq(7) were entrained to 11 different photoperiods in a 24-h day (2-22 h) and to zeitgebers with six different T (16-26 h), and then released to constant darkness. tau-Aftereffects in response to different photoperiods correlated weakly with prior photoperiod in frq+ and were unsystematic in both period mutant strains. Strength and direction of the tau-aftereffect in zeitgeber cycles with different T depended on their length and on the strain, showing a negative correlation with zeitgeber length in frq+ and positive correlations in frq(1) and frq(7). It has been proposed that tau-aftereffects are based on interactions of oscillators within a cellular network. The present findings in Neurospora, which grows as a syncytium, suggest that tau-aftereffects also exist in circadian systems based on multioscillatory networks organized at the molecular level. |
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Authors:
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Julia Diegmann; Astrid Stück; Cornelia Madeti; Till Roenneberg |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Chronobiology international Volume: 27 ISSN: 1525-6073 ISO Abbreviation: Chronobiol. Int. Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-27 Completed Date: 2010-12-16 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8501362 Medline TA: Chronobiol Int Country: England |
Other Details:
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Languages: eng Pagination: 1335-47 Citation Subset: IM |
Affiliation:
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Institute for Medical Psychology, Ludwig-Maximilian University, Munich, Germany. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Circadian Clocks
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physiology* Circadian Rhythm / physiology* Darkness Light Neurospora crassa / physiology Photoperiod* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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