Transcriptional profile of rve8 in circadian time course
Ontology highlight
ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE37278 | GEO | 2012/12/20
SECONDARY ACCESSION(S): PRJNA159253
REPOSITORIES: GEO
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Project description:Analysis of Arabidopsis Columbia and rve8-1, a longer period mutant, in circadian time course (ZT72-116). Results provide insight into where RVE8 functions in the clock system and the targets regulated by RVE8. Arabidopsis Col and rve8-1 seedlings (~50 plants/ per sample) were grown in 12 hours light/ 12 hours dark for 7 days before releasing to the constant light. After 72 hours in the constant light, samples were harvested every 4 hours for 2 days. RNA was extracted, labeled and hybridized onto Agronomics1 tiling arrays.
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Project description:Background. The transcriptional circuits of circadian clocks control physiological and behavioral rhythms. Light may affect such overt rhythms in two ways: (1) by entraining the clock circuits and (2) via clock-independent molecular pathways. In this study we examine the relationship between autonomous transcript oscillations and light-driven transcript responses Methodology/Principal Findings. Transcript profiles of wild-type and arrhythmic mutant Drosophila were recorded both in the presence of an environmental photocycle and in constant darkness. Systematic autonomous oscillations in the 12-48 hr period range were detectable only in wild-type flies and occurred preferentially at the circadian period length. However, an extensive program of light-driven expression was confirmed in arrhythmic mutant flies. Many lightresponsive transcripts are preferentially expressed in the adult compound eye and the phospholipase C component of phototransduction, NO RECEPTOR POTENTIAL (NORPA), is required for their light-dependent regulation. Conclusions/Significance. Although there is growing evidence for the existence of multiple molecular clock circuits in plants and fungi, Drosophila appears to possess only one such system. The sustained photic expression responses identified here are partially coupled to the circadian clock and may reflect a mechanism for flies to modulate functions such as visual sensitivity and synaptic transmission in response to seasonal changes in photoperiod. Keywords: Time course
2006-02-03 | GSE3832 | GEO
Project description:Background. The transcriptional circuits of circadian clocks control physiological and behavioral rhythms. Light may affect such overt rhythms in two ways: (1) by entraining the clock circuits and (2) via clock-independent molecular pathways. In this study we examine the relationship between autonomous transcript oscillations and light-driven transcript responses Methodology/Principal Findings. Transcript profiles of wild-type and arrhythmic mutant Drosophila were recorded both in the presence of an environmental photocycle and in constant darkness. Systematic autonomous oscillations in the 12-48 hr period range were detectable only in wild-type flies and occurred preferentially at the circadian period length. However, an extensive program of light-driven expression was confirmed in arrhythmic mutant flies. Many lightresponsive transcripts are preferentially expressed in the adult compound eye and the phospholipase C component of phototransduction, NO RECEPTOR POTENTIAL (NORPA), is required for their light-dependent regulation. Conclusions/Significance. Although there is growing evidence for the existence of multiple molecular clock circuits in plants and fungi, Drosophila appears to possess only one such system. The sustained photic expression responses identified here are partially coupled to the circadian clock and may reflect a mechanism for flies to modulate functions such as visual sensitivity and synaptic transmission in response to seasonal changes in photoperiod. Keywords: Time course
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Project description:Background. The transcriptional circuits of circadian clocks control physiological and behavioral rhythms. Light may affect such overt rhythms in two ways: (1) by entraining the clock circuits and (2) via clock-independent molecular pathways. In this study we examine the relationship between autonomous transcript oscillations and light-driven transcript responses Methodology/Principal Findings. Transcript profiles of wild-type and arrhythmic mutant Drosophila were recorded both in the presence of an environmental photocycle and in constant darkness. Systematic autonomous oscillations in the 12-48 hr period range were detectable only in wild-type flies and occurred preferentially at the circadian period length. However, an extensive program of light-driven expression was confirmed in arrhythmic mutant flies. Many lightresponsive transcripts are preferentially expressed in the adult compound eye and the phospholipase C component of phototransduction, NO RECEPTOR POTENTIAL (NORPA), is required for their light-dependent regulation. Conclusions/Significance. Although there is growing evidence for the existence of multiple molecular clock circuits in plants and fungi, Drosophila appears to possess only one such system. The sustained photic expression responses identified here are partially coupled to the circadian clock and may reflect a mechanism for flies to modulate functions such as visual sensitivity and synaptic transmission in response to seasonal changes in photoperiod. For more information see also http://biorhythm.rockefeller.edu. Keywords: Time course
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