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• W2613516893 endingPage "e0177197" @default.
• W2613516893 startingPage "e0177197" @default.
• W2613516893 abstract "Molecular mechanisms responsible for 24 h circadian oscillations, entrainment to external cues, encoding of day length and the time-of-day effects have been well studied experimentally. However, it is still debated from the molecular network point of view whether each cell in suprachiasmatic nuclei harbors two molecular oscillators, where one tracks dawn and the other tracks dusk activities. A single cell dual morning and evening oscillator was proposed by Daan et al., based on the molecular network that has two sets of similar non-redundant per1/cry1 and per2/cry2 circadian genes and each can independently maintain their endogenous oscillations. Understanding of dual oscillator dynamics in a single cell at molecular level may provide insight about the circadian mechanisms that encodes day length variations and its response to external zeitgebers. We present here a realistic dual oscillator model of circadian rhythms based on the series of hypotheses proposed by Daan et al., in which they conjectured that the circadian genes per1/cry1 track dawn while per2/cry2 tracks dusk and they together constitute the morning and evening oscillators (dual oscillator). Their hypothesis also provides explanations about the encoding of day length in terms of molecular mechanisms of per/cry expression. We frame a minimal mathematical model with the assumption that per1 acts a morning oscillator and per2 acts as an evening oscillator and to support and interpret this assumption we fit the model to the experimental data of per1/per2 circadian temporal dynamics, phase response curves (PRC's), and entrainment phenomena under various light-dark conditions. We also capture different patterns of splitting phenomena by coupling two single cell dual oscillators with neuropeptides vasoactive intestinal polypeptide (VIP) and arginine vasopressin (AVP) as the coupling agents and provide interpretation for the occurrence of splitting in terms of ME oscillators, though they are not required to explain the morning and evening oscillators. The proposed dual oscillator model based on Daan's hypothesis supports per1 and per2 playing the role of morning and evening oscillators respectively and this may be the first step towards the understanding of the core molecular mechanism responsible for encoding the day length." @default.
• W2613516893 created "2017-05-19" @default.
• W2613516893 creator A5019492193 @default.
• W2613516893 creator A5033655205 @default.
• W2613516893 date "2017-05-09" @default.
• W2613516893 modified "2023-09-27" @default.
• W2613516893 title "Hypothesis driven single cell dual oscillator mathematical model of circadian rhythms" @default.
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• W2613516893 doi "https://doi.org/10.1371/journal.pone.0177197" @default.
• W2613516893 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5423656" @default.
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• W2613516893 hasPublicationYear "2017" @default.
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