Petri, Bernhard and Stengl, Monika (2001) Phase response curves of a molecular model oscillator: Implications for mutual coupling of paired oscillators. JOURNAL OF BIOLOGICAL RHYTHMS, 16 (2). pp. 125-141. ISSN 0748-7304
Full text not available from this repository. (Request a copy)Abstract
Increasing evidence indicates that the accessory medulla is the circadian pacemaker controlling locomotor activity rhythms in insects. A prominent group of neurons of this neuropil shows immunoreactivity to the peptide pigment-dispersing hormone (PDH). In Drosophila melanogaster, the PDH-immunoreactive (PDH-ir) lateral neurons, which also express the clock genes period and timeless, are assumed to be circadian pacemaker cells themselves. In other insects, such as Leucophaea maderae, a subset of apparently homologue PDH-ir cells is a candidate for the circadian coupling pathway of the bilaterally symmetric clocks. Although knowledge about molecular mechanisms of the circadian clockwork is increasing rapidly, very little is known about mechanisms of circadian coupling. The authors used a computer model, based on the molecular feedback loop of the clock genes in D. melanogaster, to test the hypothesis that release of PDH is involved in the coupling between bilaterally paired oscillators. They can show that a combination of all-delay- and all-advance-type interactions between two model oscillators matches best the experimental findings on mutual pacemaker coupling in L. maderae. The model predicts that PDH affects the phosphorylation rate of clock genes and that in addition to PDH, another neuroactive substance is involved in the coupling pathway, via an all-advance type of interaction. The model suggests that PDH and light pulses, represented by two distinct classes of phase response curves, have different targets in the oscillatory feedback loop and are, therefore, likely to act in separate input pathways to the clock.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COCKROACH LEUCOPHAEA-MADERAE; HORMONE-IMMUNOREACTIVE NEURONS; DROSOPHILA CIRCADIAN CLOCK; LOCOMOTOR-ACTIVITY RHYTHM; PERIOD GENE-PRODUCT; ACCESSORY MEDULLA; VISUAL-SYSTEM; BEHAVIORAL RHYTHMS; PACEMAKER NEURONS; PHOTIC REGULATION; circadian rhythm; period; timeless; PDH; PRC; model oscillator; Drosophila melanogaster; Leucophaea maderae |
| Subjects: | 500 Science > 590 Zoological sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Zoologie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Feb 2022 10:29 |
| Last Modified: | 07 Feb 2022 10:29 |
| URI: | https://pred.uni-regensburg.de/id/eprint/41564 |
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