Summary
Dietary restriction enhances circadian rhythm amplitude by upregulating phototransduction genes in the eye, creating a positive feed-forward loop that requires light-dark cycles to function. These findings suggest that optimizing light exposure may work synergistically with dietary interventions to maintain circadian health and delay age-related visual decline.
Key Findings
- DR selectively amplified expression and circadian amplitude of phototransduction genes (trp, trpL, inac) in Drosophila heads compared to high-nutrient diet controls
- DR enhanced positive phototaxis (light sensitivity behavioral measure) and delayed age-related visual decline in flies
- DR failed to enhance circadian amplitude when flies were kept in constant darkness, demonstrating that light-dark cycles are required for DR's circadian benefits
- Circadian optogenetic depolarization of photoreceptor cells rescued peripheral circadian amplitude in high-nutrient diet flies, mimicking DR effects
- DR increased the total number of circadian transcripts detected by mRNA microarray in fly heads
Categories
Sleep & Circadian Health: DR enhances circadian amplitude through increased light sensitivity, demonstrating a feed-forward loop between the circadian clock and phototransduction.
Eye Health & Vision: DR delays age-related visual decline by upregulating phototransduction genes, preserving photoreceptor function in aging eyes.
The Science of Light: Study elucidates mechanistic links between phototransduction cascade gene expression (trp, trpL, inac) and circadian clock amplitude under different dietary conditions.
Author(s)
G Meyerhof
Publication Year
2019
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 twoâprocess model of sleep regulation: a reappraisal
- Melanopsin is required for non-image-forming photic responses in blind mice
- Strange vision: ganglion cells as circadian photoreceptors
Eye Health & Vision
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Genetic reactivation of cone photoreceptors restores visual responses in retinitis pigmentosa
- Melanopsin and rodâcone photoreceptors play different roles in mediating pupillary light responses during exposure to continuous light in humans
- Characteristic patterns of dendritic remodeling in early-stage glaucoma: evidence from genetically identified retinal ganglion cell types
- Intrinsically photosensitive melanopsin retinal ganglion cell contributions to the pupillary light reflex and circadian rhythm
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