Light and the evolution of vision

Williams, David L.

doi:10.1038/eye.2015.220

Cited by 14 publications

(9 citation statements)

References 42 publications

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“…The type I NOP-1 opsin was then acquired by dikaryan fungi, fulfilling green-light-sensing functions. 32,33,37 The early evolution of blue-and green-light receptors in the fungi fits with its essential role in the regulation of circadian clocks and the predominance of blue-green-light wavelengths, which penetrate the aquatic depths, [38][39][40] where the fungi first diversified. 41,42 Lastly, red-light sensing in fungi is performed by the phytochromes PHY-1 and PHY-2.…”

Section: Reportmentioning

confidence: 99%

A light-sensing system in the common ancestor of the fungi

et al. 2022

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Section: Reportmentioning

confidence: 99%

A light-sensing system in the common ancestor of the fungi

et al. 2022

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“…Organismal responses to a diel, or daily, light cue can result from two general processes: direct response to the exogenous light or a free‐running rhythmic response due to an endogenous timekeeper (circadian clock; Berson, Dunn, & Takao, ; Miyamoto & Sancar, ; Williams, ). Direct responses occur only when an organism responds postillumination where the light impacts particular cells directly and the response does not continue in the absence of repeated light exposures.…”

Section: Introductionmentioning

confidence: 99%

Transcriptional remodelling upon light removal in a model cnidarian: Losses and gains in gene expression

Leach

Reitzel

2019

Molecular Ecology

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Organismal responses to light:dark cycles can result from two general processes: (a) direct response to light or (b) a free‐running rhythm (i.e., a circadian clock). Previous research in cnidarians has shown that candidate circadian clock genes have rhythmic expression in the presence of diel lighting, but these oscillations appear to be lost quickly after removal of the light cue. Here, we measure whole‐organism gene expression changes in 136 transcriptomes of the sea anemone Nematostella vectensis, entrained to a light:dark environment and immediately following light cue removal to distinguish two broadly defined responses in cnidarians: light entrainment and circadian regulation. Direct light exposure resulted in significant differences in expression for hundreds of genes, including more than 200 genes with rhythmic, 24‐hr periodicity. Removal of the lighting cue resulted in the loss of significant expression for 80% of these genes after 1 day, including most of the hypothesized cnidarian circadian genes. Further, 70% of these candidate genes were phase‐shifted. Most surprisingly, thousands of genes, some of which are involved in oxidative stress, DNA damage response and chromatin modification, had significant differences in expression in the 24 hr following light removal, suggesting that loss of the entraining cue may induce a cellular stress response. Together, our findings suggest that a majority of genes with significant differences in expression for anemones cultured under diel lighting are largely driven by the primary photoresponse rather than a circadian clock when measured at the whole animal level. These results provide context for the evolution of cnidarian circadian biology and help to disassociate two commonly confounded factors driving oscillating phenotypes.

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“…Strikingly, the structures for vision are well conserved. The photoreceptors in prokaryotes and eukaryotic protists, such as algae, are similar to our rods and cones (Williams, 2016).…”

Section: Q Have You Used the Bsl Glossary While At School Or Universmentioning

confidence: 99%

Do you see what I see? Viewing the world through the prism of colour blindness

Torrens¹

2019

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Light and the evolution of vision

Cited by 14 publications

References 42 publications

A light-sensing system in the common ancestor of the fungi

A light-sensing system in the common ancestor of the fungi

Transcriptional remodelling upon light removal in a model cnidarian: Losses and gains in gene expression

Do you see what I see? Viewing the world through the prism of colour blindness

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