Ancestral photoreceptor diversity as the basis of visual behaviour

Nature Ecology & Evolution, Journal Year: 2024, Volume and Issue: 8(3), P. 374 - 386

Published: Jan. 22, 2024

Language: Английский

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The Visual Opsin Gene Repertoires of Teleost Fishes: Evolution, Ecology, and Function

Annual Review of Cell and Developmental Biology, Journal Year: 2021, Volume and Issue: 37(1), P. 441 - 468

Published: Aug. 5, 2021

Visual opsin genes expressed in the rod and cone photoreceptor cells of retina are core components visual sensory system vertebrates. Here, we provide an overview dynamic evolution most species-rich group vertebrates, teleost fishes. The examination rich genomic resources now available for this reveals that fish genomes contain more copies than present amphibians, reptiles, birds, mammals. expansion fishes is due primarily to a combination ancestral lineage-specific gene duplications. Following their duplication, repeatedly diversified at same key spectral-tuning sites, generating arrays pigments sensitive ultraviolet red spectrum light. Species-specific repertoires correlate strongly with underwater light habitats, ecology, color-based sexual selection.

Language: Английский

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Evolution of central neural circuits: state of the art and perspectives

Nature reviews. Neuroscience, Journal Year: 2022, Volume and Issue: 23(12), P. 725 - 743

Published: Oct. 26, 2022

Language: Английский

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Mitochondria in cone photoreceptors act as microlenses to enhance photon delivery and confer directional sensitivity to light

Science Advances, Journal Year: 2022, Volume and Issue: 8(9)

Published: March 2, 2022

Mammalian photoreceptors aggregate numerous mitochondria, organelles chiefly for energy production, in the ellipsoid region immediately adjacent to light-sensitive outer segment support high metabolic demands of phototransduction. However, these complex, lipid-rich are also poised affect light passage into segment. Here, we show, via live imaging and simulations, that despite this risk scattering or absorption, tightly packed mitochondria “focus” entry mitochondrial remodeling affects such concentration. This “microlens”-like feature cone delivers with an angular dependence akin Stiles-Crawford effect (SCE), providing a simple explanation essential visual phenomenon improves resolution. new insight optical role is relevant interpretation clinical ophthalmological imaging, lending use SCE as early diagnostic tool retinal disease.

Language: Английский

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State-dependent pupil dilation rapidly shifts visual feature selectivity

Nature, Journal Year: 2022, Volume and Issue: 610(7930), P. 128 - 134

Published: Sept. 28, 2022

Language: Английский

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Whole-brain imaging of freely-moving zebrafish

Frontiers in Neuroscience, Journal Year: 2023, Volume and Issue: 17

Published: April 17, 2023

One of the holy grails neuroscience is to record activity every neuron in brain while an animal moves freely and performs complex behavioral tasks. While important steps forward have been taken recently large-scale neural recording rodent models, single resolution across entire mammalian remains elusive. In contrast larval zebrafish offers great promise this regard. Zebrafish are a vertebrate model with substantial homology brain, but their transparency allows whole-brain recordings genetically-encoded fluorescent indicators at single-neuron using optical microscopy techniques. Furthermore begin show repertoire natural behavior from early age, including hunting small, fast-moving prey visual cues. Until work address bases these behaviors mostly relied on assays where fish was immobilized under microscope objective, stimuli such as were presented virtually. However significant progress has made developing imaging techniques for which not immobilized. Here we discuss recent advances, focusing particularly based light-field microscopy. We also draw attention several outstanding issues remain be addressed increase ecological validity results obtained.

Language: Английский

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From water to land: Evolution of photoreceptor circuits for vision in air

PLoS Biology, Journal Year: 2024, Volume and Issue: 22(1), P. e3002422 - e3002422

Published: Jan. 22, 2024

When vertebrates first conquered the land, they encountered a visual world that was radically distinct from of their aquatic ancestors. Fish exploit strong wavelength-dependent interactions light with water by differentially feeding signals up to 5 spectral photoreceptor types into behavioural programmes. However, above same rules do not apply, and this called for an update circuit strategies. Early tetrapods soon evolved double cone, still poorly understood pair new photoreceptors brought “ancestral terrestrial” complement 7. Subsequent nonmammalian lineages adapted highly parallelised retinal input strategy diverse ecologies. By contrast, mammals shed most ancestral converged on is exceptionally general. In eutherian including in humans, parallelisation emerges gradually as signal traverses layers retina brain.

Language: Английский

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Ultraviolet vision in anemonefish improves colour discrimination

Journal of Experimental Biology, Journal Year: 2024, Volume and Issue: 227(7)

Published: April 1, 2024

ABSTRACT In many animals, ultraviolet (UV) vision guides navigation, foraging, and communication, but few studies have addressed the contribution of UV signals to colour vision, or measured discrimination thresholds using behavioural experiments. Here, we tested in an anemonefish (Amphiprion ocellaris) a five-channel (RGB-V-UV) LED display. We first determined that maximal sensitivity A. ocellaris cone was ∼386 nm microspectrophotometry. Three additional spectral sensitivities had maxima at ∼497, 515 ∼535 nm. then behaviourally by training distinguish coloured target pixel from grey distractor pixels varying intensity. Thresholds were calculated for nine sets colours with without signals. Using tetrachromatic model, found better (i.e. lower) discriminating when higher chromatic contrast. These caused greater stimulation relative other types. findings imply component cues improves their detectability, which likely increases prominence body patterns communication silhouette zooplankton prey.

Language: Английский

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Ancient origin of the rod bipolar cell pathway in the vertebrate retina

Nature Ecology & Evolution, Journal Year: 2024, Volume and Issue: 8(6), P. 1165 - 1179

Published: April 16, 2024

Language: Английский

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Retinotectal circuitry of larval zebrafish is adapted to detection and pursuit of prey

eLife, Journal Year: 2020, Volume and Issue: 9

Published: Oct. 12, 2020

Retinal axon projections form a map of the visual environment in tectum. A zebrafish larva typically detects prey object its peripheral field. As it turns and swims towards prey, stimulus enters central, binocular area, seemingly expands size. By volumetric calcium imaging, we show that posterior tectal neurons, which serve to detect at distance, tend respond small objects intrinsically compute their direction movement. Neurons anterior tectum, where image is represented shortly before capture strike, are tuned larger sizes frequently not direction-selective, indicating mainly interocular comparisons an object’s movement close range. The feature originates from linear combination diverse, functionally specialized, lamina-specific, topographically ordered retinal ganglion cell synaptic inputs. We conclude local cell-type composition connectivity across tectum adapted processing location-dependent, behaviorally relevant features.

Language: Английский

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