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Pigment evolution

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https://www.readbyqxmd.com/read/28437524/the-evolution-of-the-plateau-an-optical-coherence-tomography-signature-seen-in-geographic-atrophy
#1
Anna C S Tan, Polina Astroz, Kunal K Dansingani, Jason S Slakter, Lawrence A Yannuzzi, Christine A Curcio, K Bailey Freund
Purpose: Histologic details of progression routes to geographic atrophy (GA) in AMD are becoming available through optical coherence tomography (OCT). We studied the origins and evolution of an OCT signature called plateau in eyes with GA and suggested a histologic correlate. Methods: Serial eye-tracked OCT scans and multimodal imaging were acquired from eight eyes of seven patients with GA and plateau signatures over a mean follow-up of 7.7 years (range, 3.7-11...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28431132/revealing-the-biochemical-and-genetic-basis-of-colour-variation-in-a-polymorphic-lizard
#2
Claire A McLean, Adrian Lutz, Katrina J Rankin, Devi Stuart-Fox, Adnan Moussalli
Determining the mechanistic and genetic basis of animal coloration is essential to understand the costs and constraints on colour production, and the evolution and maintenance of phenotypic variation. However, genes underlying structural colour and widespread pigment classes apart from melanin remain largely uncharacterised, in part due to restricted taxonomic focus. We combined liquid chromatography-mass spectrometry and RNA-seq gene expression analyses to characterise the pigments and genes associated with skin colour in the polymorphic lizard, Ctenophorus decresii...
April 18, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28428036/giantcell-tumor-of-tendon-sheath-open-surgery-or-arthroscopic-synovectomy-a-systematic-review-of-the-literature
#3
REVIEW
Thibaut Noailles, Kevin Brulefert, Sylvain Briand, Pierre Marie Longis, Kevin Andrieu, Antoine Chalopin, François Gouin
PURPOSE: Giantcell tumor of tendon sheath(GCTTS)formelyknowned as pigmented villonodular synovitis (PVNS) is a benign, locally aggressive, proliferative disorder of the synovium involving a joint, bursa, or tendon sheath. Treatment ofGCTTSinvolves early surgical resection to limit articular destruction and the risk of recurrence. Synovectomy remains the treatment of choice forGCTTSbut without clear consensus to make an open or arthroscopic synovectomy andno certainty on the responsibility of surgery in the evolution towards the degenerative osteoarthritis...
April 17, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28424460/generation-of-heritable-germline-mutations-in-the-jewel-wasp-nasonia-vitripennis-using-crispr-cas9
#4
Ming Li, Lauren Yun Cook Au, Deema Douglah, Abigail Chong, Bradley J White, Patrick M Ferree, Omar S Akbari
The revolutionary RNA-guided endonuclease CRISPR/Cas9 system has proven to be a powerful tool for gene editing in a plethora of organisms. Here, utilizing this system we developed an efficient protocol for the generation of heritable germline mutations in the parasitoid jewel wasp, Nasonia vitripennis, a rising insect model organism for the study of evolution, development of axis pattern formation, venom production, haplo-diploid sex determination, and host-symbiont interactions. To establish CRISPR-directed gene editing in N...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28413232/the-freshwater-red-alga-batrachospermum-turfosum-florideophyceae-can-acclimate-to-a-wide-range-of-light-and-temperature-conditions
#5
Siegfried Aigner, Andreas Holzinger, Ulf Karsten, Ilse Kranner
Batrachospermum turfosum Bory is one of the generalists among the few red algae that have adapted to freshwater habitats, occurring in a variety of primarily shaded, nutrient-poor micro-habitats with lotic (running) or lentic (standing) waters. Seasonal variations in water level and canopy cover can expose this sessile alga to widely fluctuating temperatures, solar irradiation and nutrient availability. Here we report on the ecophysiology of B. turfosum collected from an ultra-oligotrophic bog pool in the Austrian Alps...
2017: Phycologia
https://www.readbyqxmd.com/read/28401467/response-of-extreme-haloarchaeon-haloarcula-argentinensis-rr10-to-simulated-microgravity-in-clinorotation
#6
Rebecca Thombre, Vinaya Shinde, Jyotsana Dixit, Sagar Jagtap, Pandit B Vidyasagar
Gravity is the fundamental force that may have operated during the evolution of life on Earth. It is thus important to understand as to what the effects of gravity are on cellular life. The studies related to effect of microgravity on cells may provide greater insights in understanding of how the physical force of gravity shaped life on Earth. The present study focuses on a unique group of organisms called the Haloarchaea, which are known for their extreme resistance to survive in stress-induced environments...
May 2017: 3 Biotech
https://www.readbyqxmd.com/read/28396824/evolutionary-analysis-of-vision-genes-identifies-potential-drivers-of-visual-differences-between-giraffe-and-okapi
#7
Edson Ishengoma, Morris Agaba, Douglas R Cavener
BACKGROUND: The capacity of visually oriented species to perceive and respond to visual signal is integral to their evolutionary success. Giraffes are closely related to okapi, but the two species have broad range of phenotypic differences including their visual capacities. Vision studies rank giraffe's visual acuity higher than all other artiodactyls despite sharing similar vision ecological determinants with many of them. The extent to which the giraffe's unique visual capacity and its difference with okapi is reflected by changes in their vision genes is not understood...
2017: PeerJ
https://www.readbyqxmd.com/read/28380787/controllable-generation-and-manipulation-of-micro-bubbles-in-water-with-absorptive-colloid-particles-by-cw-laser-radiation
#8
O V Angelsky, A Ya Bekshaev, P P Maksimyak, A P Maksimyak, S G Hanson, S M Kontush
Micrometer-sized vapor-gas bubbles are formed due to local heating of a water suspension containing absorptive pigment particles of 100 nm diameter. The heating is performed by CW near-infrared (980 nm) laser radiation with controllable power, focused into a 100 μm spot within a 2 mm suspension layer. By changing the laser power, four regimes are realized: (1) bubble generation; (2) stable growth of the existing bubbles; (3) stationary existence of the bubbles and (4) the bubbles' shrinkage and collapse. This behavior is interpreted based on the temperature conditions...
March 6, 2017: Optics Express
https://www.readbyqxmd.com/read/28370617/genomic-evidence-for-convergent-evolution-of-a-key-trait-underlying-divergence-in-island-birds
#9
Elizabeth A Cooper, J Albert C Uy
Reproductive isolation can be initiated by changes in one or a few key traits that prevent random mating among individuals in a population. During the early stages of speciation, when isolation is often incomplete, there will be a heterogeneous pattern of differentiation across regions of the genome between diverging populations, with loci controlling these key traits appearing the most distinct as a result of strong diversifying selection. In this study, we used Illumina-sequenced ddRAD tags to identify genome-wide patterns of differentiation in three recently-diverged island populations of the Monarcha castaneiventris ycatcher of the Solomon Islands...
March 28, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28364123/anomalous-evolution-of-broadband-optical-absorption-reveals-dynamic-solid-state-reorganization-during-eumelanin%C3%A2-build-up-in-thin-films
#10
Carmela Bonavolontà, Corrado de Lisio, Marco d'Ischia, Pasqualino Maddalena, Paola Manini, Alessandro Pezzella, Massimo Valentino
The origin of eumelanin optical properties remains a formidable conundrum preventing a detailed understanding of the complex photo-protective role of these widespread natural pigments and the rational design of innovative bioinspired materials for optoelectronic applications. Here we report the unusual kinetic and thickness-dependent evolution of the optical properties of black eumelanin polymers generated by spontaneous aerial polymerization of 5,6-dihydroxyindole (DHI) thin films (0.1-1 μm), consistent with peculiar solid state reorganization mechanisms governing broadband absorption...
March 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28358282/efficacy-of-a-film-forming-medical-device-containing-sunscreen-50-and-piroxicam-0-8-in-actinic-keratosis-and-field-cancerization-a-multicenter-assessor-blinded-3-month-trial
#11
Mario Puviani, Chiara Galloni, Silvia Marchetti, Paolo Sergio Pavone, Silvia Lovati, Giuseppe Pistone, Valentina Caputo, Giovanna Tilotta, Giuseppe Scarcella, Elena Campione, Laura Diluvio, Virginia Garofalo, Luca Bianchi, Massimo Milani
INTRODUCTION: Sunscreen protection in subjects with actinic keratosis (AK) is highly recommended to prevent clinical evolution of this in situ skin cancer condition. Use of topical anti-cyclooxygenase drugs such as diclofenac and piroxicam reduces the number of lesions and improves the cancerization field. A film-forming medical device in a cream formulation containing organic and inorganic sun-filters (50+ SPF) and piroxicam 0.8% (ACTX) has shown in a pilot, single-center, open trial to reduce AK lesions improving the cancerization field...
April 20, 2017: Current Medical Research and Opinion
https://www.readbyqxmd.com/read/28337898/melanin-of-the-nipple-areola-complex
#12
A Goren, M Kovacevic, T Lotti
Biological pigments or biochromes are ubiquitous in animals, plants, and simpler organisms such as fungi and bacteria. They serve a wide spectrum of functions from photosynthesis, camouflage, mimicry, photo protection from the environment to attracting mates. The human female nipple areola complex (NAC) is a highly-pigmented area. Currently, the prevailing theory as to the evolution of the pigmented human NAC is based on infant recognition of breast feeding latching zone; however, due to the protruding shape of the nipple and surrounding breast, the authors of this letter believe that the evolutionary advantage of the pigmented NAC has a direct physiological function, namely the initiation of involution at the end of the infant lactation period...
January 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28336284/macular-pigment-density-variation-after-supplementation-of-lutein-and-zeaxanthin-using-the-visucam-%C3%A2-200-pigment-module-impact-of-age-related-macular-degeneration-and-lens-status
#13
G Azar, M Quaranta-El Maftouhi, J-J Masella, M Mauget-Faÿsse
PURPOSE: To assess the evolution of macular pigment optical density (MPOD) following supplementation with various macular formulations obtained with the Visucam(®) 200, and to study the factors affecting MPOD measurements. MATERIALS AND METHODS: In this prospective, randomized, double-masked multicenter study, patients were divided into 2 groups: group A (patients without retinal pathology who underwent cataract surgery 1 month previously) and group B (patients with neovascular age-related macular degeneration [AMD] in one eye)...
April 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28320315/comparative-transcriptome-analyses-of-flower-development-in-four-species-of-achimenes-gesneriaceae
#14
Wade R Roberts, Eric H Roalson
BACKGROUND: Flowers have an amazingly diverse display of colors and shapes, and these characteristics often vary significantly among closely related species. The evolution of diverse floral form can be thought of as an adaptive response to pollination and reproduction, but it can also be seen through the lens of morphological and developmental constraints. To explore these interactions, we use RNA-seq across species and development to investigate gene expression and sequence evolution as they relate to the evolution of the diverse flowers in a group of Neotropical plants native to Mexico-magic flowers (Achimenes, Gesneriaceae)...
March 20, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28253223/observation-and-clinical-pattern-in-patients-with-white-dot-syndromes-the-role-of-color-photography-in-monitoring-ocular-changes-in-long-term-observation
#15
Joanna Brydak-Godowska, Joanna Gołębiewska, Monika Turczyńska, Joanna Moneta-Wielgoś, Agnieszka Samsel, Piotr K Borkowski, Michał Ciszek, Agnieszka Płonecka-Rodzoch, Aleksandra Kużnik-Borkowska, Joanna Ciszewska, Elżbieta Makomaska-Szaroszyk, Lidia B Brydak, Dariusz Kęcik
BACKGROUND The aim of this study was to assess the clinical course and distinctive features of different white dot syndromes (WDS) in patients attending the Ophthalmology Department, Medical University of Warsaw in the years 1995-2015. MATERIAL AND METHODS Sixty-two (62) patients (43 females and 19 males), aged 18 to 77 years, referred with a WDS were included in this prospective study, with observation period ranging from 5 months to 16 years. All patients underwent a complete ophthalmological examination and multimodal imaging studies...
March 2, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28250185/epistatic-interactions-influence-terrestrial-marine-functional-shifts-in-cetacean-rhodopsin
#16
Sarah Z Dungan, Belinda S W Chang
Like many aquatic vertebrates, whales have blue-shifting spectral tuning substitutions in the dim-light visual pigment, rhodopsin, that are thought to increase photosensitivity in underwater environments. We have discovered that known spectral tuning substitutions also have surprising epistatic effects on another function of rhodopsin, the kinetic rates associated with light-activated intermediates. By using absorbance spectroscopy and fluorescence-based retinal release assays on heterologously expressed rhodopsin, we assessed both spectral and kinetic differences between cetaceans (killer whale) and terrestrial outgroups (hippo, bovine)...
March 15, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28248295/structure-of-the-plant-photosystem-i-supercomplex-at-2-6%C3%A2-%C3%A3-resolution
#17
Yuval Mazor, Anna Borovikova, Ido Caspy, Nathan Nelson
Four elaborate membrane complexes carry out the light reaction of oxygenic photosynthesis. Photosystem I (PSI) is one of two large reaction centres responsible for converting light photons into the chemical energy needed to sustain life. In the thylakoid membranes of plants, PSI is found together with its integral light-harvesting antenna, light-harvesting complex I (LHCI), in a membrane supercomplex containing hundreds of light-harvesting pigments. Here, we report the crystal structure of plant PSI-LHCI at 2...
March 1, 2017: Nature Plants
https://www.readbyqxmd.com/read/28246038/the-wheat-mutant-della-encoding-gene-rht-b1c-affects-plant-photosynthetic-responses-to-cadmium-stress
#18
Anelia G Dobrikova, Ekaterina K Yotsova, Andreas Börner, Svetlana P Landjeva, Emilia L Apostolova
Тhe sensitivity to cadmium (Cd) stress of two near-isogenic wheat lines with differences at the Rht-B1 locus, Rht-B1a (tall wild type, encoding DELLA proteins) and Rht-B1c (dwarf mutant, encoding modified DELLA proteins), was investigated. The effects of 100 μM CdCl2 on plant growth, pigment content and functional activity of the photosynthetic apparatus of wheat seedlings grown on a nutrient solution were evaluated through a combination of PAM chlorophyll fluorescence, oxygen evolution, oxidation-reduction kinetics of P700 and 77 K fluorescence...
February 20, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28244868/lipid-droplet-biology-and-evolution-illuminated-by-the-characterization-of-a-novel-perilipin-in-teleost-fish
#19
James G Granneman, Vickie A Kimler, Huamei Zhang, Xiangqun Ye, Xixia Luo, John H Postlethwait, Ryan Thummel
Perilipin (PLIN) proteins constitute an ancient family important in lipid droplet (LD) formation and triglyceride metabolism. We identified an additional PLIN clade (plin6) that is unique to teleosts and can be traced to the two whole genome duplications that occurred early in vertebrate evolution. Plin6 is highly expressed in skin xanthophores, which mediate red/yellow pigmentation and trafficking, but not in tissues associated with lipid metabolism. Biochemical and immunochemical analyses demonstrate that zebrafish Plin6 protein targets the surface of pigment-containing carotenoid droplets (CD)...
February 28, 2017: ELife
https://www.readbyqxmd.com/read/28231253/community-analysis-of-pigment-patterns-from-37-microalgae-strains-reveals-new-carotenoids-and-porphyrins-characteristic-of-distinct-strains-and-taxonomic-groups
#20
Benoît Serive, Elodie Nicolau, Jean-Baptiste Bérard, Raymond Kaas, Virginie Pasquet, Laurent Picot, Jean-Paul Cadoret
Phytoplankton, with an estimated 30 000 to 1 000 000 species clustered in 12 phyla, presents a high taxonomic and ecophysiological diversity, reflected by the complex distribution of pigments among the different algal classes. High performance liquid chromatography is the gold standard method for qualitative and quantitative analysis of phytoplankton pigments in seawater and culture samples, but only a few pigments can be used as robust chemotaxonomic markers. A major challenge is thus to identify new ones, characteristic of a strain, species, class or taxon that cannot be currently identified on the basis of its pigment signature...
2017: PloS One
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