| Effects of aging on the molecular circadian oscillations in Drosophila. | |
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MedLine Citation:
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PMID: 22217096 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Circadian clocks maintain temporal homeostasis by generating daily output rhythms in molecular, cellular, and physiological functions. Output rhythms, such as sleep/wake cycles and hormonal fluctuations, tend to deteriorate during aging in humans, rodents, and fruit flies. However, it is not clear whether this decay is caused by defects in the core transcriptional clock, or weakening of the clock-output pathways, or both. The authors monitored age-related changes in behavioral and molecular rhythms in Drosophila melanogaster. Aging was associated with disrupted rest/activity patterns and lengthening of the free-running period of the circadian locomotor activity rhythm. The expression of core clock genes was measured in heads and bodies of young, middle-aged, and old flies. Transcriptional oscillations of four clock genes, period, timeless, Par domain protein 1ϵ, and vrille, were significantly reduced in heads, but not in bodies, of aging flies. It was determined that reduced transcription of these genes was not caused by the deficient expression of their activators, encoded by Clock and cycle genes. Interestingly, transcriptional activation by CLOCK-CYCLE complexes was impaired despite reduced levels of the PERIOD repressor protein in old flies. These data suggest that aging alters the properties of the core transcriptional clock in flies such that both the positive and the negative limbs of the clock are attenuated. (Author correspondence: giebultj@science.oregonstate.edu ). |
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Authors:
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Kuntol Rakshit; Natraj Krishnan; Elżbieta M Guzik; Elżbieta Pyza; Jadwiga M Giebultowicz |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Chronobiology international Volume: 29 ISSN: 1525-6073 ISO Abbreviation: Chronobiol. Int. Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-01-05 Completed Date: - 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: 5-14 Citation Subset: IM |
Affiliation:
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Department of Zoology , Oregon State University , Corvallis, Oregon , USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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