Summary
This study reveals that circadian gene expression (Per2 and Arntl) is not uniform across the brain but follows a spatiotemporal gradient, with acrophase times incrementally delayed with increasing distance from a caudomedial region. This finding helps explain why bulk-brain circadian rhythms appear dampened compared to peripheral organs and has implications for understanding how lighting interventions influence central circadian coordination.
Key Findings
- Per2 and Arntl expression acrophase times are incrementally delayed with increasing distance from a caudomedial region of the rat brain, demonstrating a spatial gradient of circadian phase.
- Circadian transcriptome oscillations in bulk brain tissue show dampened amplitude compared to peripheral organs, explained by phase heterogeneity across thousands of brain voxels rather than absent rhythmicity.
- A previously uncharacterized spatiotemporal organization of circadian rhythms was identified across the rat brain using high-resolution voxel-based analysis.
Categories
Sleep & Circadian Health: Investigates spatial organization of circadian gene expression (Per2, Arntl) across brain regions, revealing phase heterogeneity relevant to understanding circadian rhythm coordination.
The Science of Light: Provides mechanistic insight into how circadian transcriptional rhythms are organized across the brain, informing understanding of entrainment and circadian regulation.
Author(s)
WT Che
Publication Year
2020
Related Publications
Sleep & Circadian Health
- Phototransduction by retinal ganglion cells that set the circadian clock
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- The twoāprocess model of sleep regulation: a reappraisal
- Melanopsin is required for non-image-forming photic responses in blind mice
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The Science of Light
- Phototransduction by retinal ganglion cells that set the circadian clock
- Color appearance models
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Melanopsin is required for non-image-forming photic responses in blind mice