Uncovering the dynamics of a circadian-dopamine model influenced by the light–dark cycle.
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| Title: | Uncovering the dynamics of a circadian-dopamine model influenced by the light–dark cycle. |
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| Authors: | Kim, Ruby1 (AUTHOR) rubykim@math.duke.edu, Witelski, Thomas P.1 (AUTHOR) |
| Source: | Mathematical Biosciences. Feb2022, Vol. 344, pN.PAG-N.PAG. 1p. |
| Subjects: | Parkinson's disease, Circadian rhythms, Health behavior, Dopamine, Affective disorders, Differential equations, Dopamine receptors |
| Abstract: | The neurotransmitter dopamine (DA) is known to be influenced by the circadian timekeeping system in the mammalian brain. We have previously created a single-cell differential equations model to understand the mechanisms behind circadian rhythms of extracellular DA. In this paper, we investigate the dynamics in our model and study different behaviors such as entrainment to the 24-hour light–dark cycle and robust periodicity versus decoupling, quasiperiodicity, and chaos. Imbalances in DA are often accompanied by disrupted circadian rhythms, such as in Parkinson's disease, hyperactivity, and mood disorders. Our model provides new insights into the links between the circadian clock and DA. We show that the daily rhythmicity of DA can be disrupted by decoupling between interlocked loops of the clock circuitry or by quasiperiodic clock behaviors caused by misalignment with the light–dark cycle. The model can be used to further study how the circadian clock affects the dopaminergic system, and to help develop therapeutic strategies for disrupted DA rhythms. • Mathematical model provides new insights into circadian modulation of dopamine. • Decoupling in the light-entrained model disrupts daily variation of dopamine. • Low light variation is linked to quasiperiodic behaviors with health consequences. • Sufficiently strong light variation creates large regions of entrainment. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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