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Zebrafish fitness

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https://www.readbyqxmd.com/read/28143724/effects-of-chronic-perfluorooctanoic-acid-pfoa-at-low-concentration-on-morphometrics-gene-expression-and-fecundity-in-zebrafish-danio-rerio
#1
Carrie E Jantzen, Fatima Toor, Kate A Annunziato, Keith R Cooper
Perfluorooctanoic acid (PFOA) is a persistent, toxic, anthropogenic chemical recalcitrant to biodegradation. Based on previous studies in lower and higher vertebrates, it was hypothesized that chronic, sub-lethal, embryonic exposure to PFOA in zebrafish (Danio rerio) would adversely impact fish development, survival, and fecundity. Zebrafish embryo/sac-fry were water exposed to 2.0 or 0nM PFOA from 3 to 120hpf, and juvenile to adult cohorts were fed spiked food (8 pM) until 6 months. After chronic exposure, PFOA exposed fish were significantly smaller in total weight and length...
January 29, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28098234/maternal-cortisol-stimulates-neurogenesis-and-affects-larval-behaviour-in-zebrafish
#2
Carol Best, Deborah M Kurrasch, Mathilakath M Vijayan
Excess glucocorticoid transferred from stressed mother to the embryo affects developing vertebrate offspring, but the underlying programming events are unclear. In this study, we tested the hypothesis that increased zygotic glucocorticoid deposition, mimicking a maternal stress scenario, modifies early brain development and larval behaviour in zebrafish (Danio rerio). Cortisol was microinjected into the yolk at one cell-stage, to mimic maternal transfer, and the larvae [96 hours post-fertilization (hpf)] displayed increased activity in light and a reduction in thigmotaxis, a behavioural model for anxiety, suggesting an increased propensity for boldness...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28093472/social-status-dependent-shift-in-neural-circuit-activation-affects-decision-making
#3
Thomas Miller, Katie Clements, Sungwoo Ahn, Choongseok Park, Eoon Hye Ji, Fadi A Issa
: In a social group, animals make behavioral decisions that fit their social ranks. These behavioral choices are dependent on the various social cues experienced during social interactions. In vertebrates, little is known of how social status affects the underlying neural mechanisms regulating decision-making circuits that drive competing behaviors. Here, we demonstrate that social status in zebrafish (Danio rerio) influences behavioral decisions by shifting the balance in neural circuit activation between two competing networks (escape and swim)...
January 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27965017/structure-and-functionalities-of-the-human-c-reactive-protein-compared-to-the-zebrafish-multigene-family-of-c-reactive-like-proteins
#4
REVIEW
Melissa Bello-Perez, Alberto Falco, Regla Medina, Jose Antonio Encinar, Beatriz Novoa, Luis Perez, Amparo Estepa, Julio Coll
Because of the recent discovery of multiple c-reactive protein (crp)-like genes in zebrafish (Danio rerio) with predicted heterogeneous phospholipid-binding amino acid sequences and heterogeneous transcript expression levels in viral survivors and adaptive-deficient mutants, zebrafish constitute an attractive new model for exploring the evolution of these protein's functions, including their possible participation in fish trained immunity. Circulating human CRP belongs to the short pentraxin family of oligomeric proteins that are characteristic of early acute-phase innate responses and is widely used as a clinical inflammation marker...
December 10, 2016: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/27884602/a-data-driven-weighting-scheme-for-multivariate-phenotypic-endpoints-recapitulates-zebrafish-developmental-cascades
#5
Guozhu Zhang, Kyle R Roell, Lisa Truong, Robert L Tanguay, David M Reif
Zebrafish have become a key alternative model for studying health effects of environmental stressors, partly due to their genetic similarity to humans, fast generation time, and the efficiency of generating high-dimensional systematic data. Studies aiming to characterize adverse health effects in zebrafish typically include several phenotypic measurements (endpoints). While there is a solid biomedical basis for capturing a comprehensive set of endpoints, making summary judgments regarding health effects requires thoughtful integration across endpoints...
January 1, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/27870856/dietary-intake-influences-adult-fertility-and-offspring-fitness-in-zebrafish
#6
Trent Newman, Noel Jhinku, Michael Meier, Julia Horsfield
The burden of malnutrition, including both over- and undernutrition, is a major public health concern. Here we used a zebrafish model of diet-induced obesity to analyze the impact of dietary intake on fertility and the phenotype of the next generation. Over an eight-week period, one group received 60 mg of food each day (60 mg arm), while another received 5 mg (5 mg arm). At the end of the diet, the body mass index of the 60 mg arm was 1.5 fold greater than the 5 mg arm. The intervention also had a marked impact on fertility; breeding success and egg production in the 60 mg arm were increased 2...
2016: PloS One
https://www.readbyqxmd.com/read/27824910/3d-finite-element-electrical-model-of-larval-zebrafish-ecg-signals
#7
James Crowcombe, Sundeep Singh Dhillon, Rhiannon Mary Hurst, Stuart Egginton, Ferenc Müller, Attila Sík, Edward Tarte
Assessment of heart function in zebrafish larvae using electrocardiography (ECG) is a potentially useful tool in developing cardiac treatments and the assessment of drug therapies. In order to better understand how a measured ECG waveform is related to the structure of the heart, its position within the larva and the position of the electrodes, a 3D model of a 3 days post fertilisation (dpf) larval zebrafish was developed to simulate cardiac electrical activity and investigate the voltage distribution throughout the body...
2016: PloS One
https://www.readbyqxmd.com/read/27761109/saccadic-and-postsaccadic-disconjugacy-in-zebrafish-larvae-suggests-independent-eye-movement-control
#8
Chien-Cheng Chen, Christopher J Bockisch, Dominik Straumann, Melody Ying-Yu Huang
Spontaneous eye movements of zebrafish larvae in the dark consist of centrifugal saccades that move the eyes from a central to an eccentric position and postsaccadic centripetal drifts. In a previous study, we showed that the fitted single-exponential time constants of the postsaccadic drifts are longer in the temporal-to-nasal (T->N) direction than in the nasal-to-temporal (N->T) direction. In the present study, we further report that saccadic peak velocities are higher and saccadic amplitudes are larger in the N->T direction than in the T->N direction...
2016: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/27737769/behavioural-plasticity-across-social-contexts-is-regulated-by-the-directionality-of-inter-individual-differences
#9
Olivia L Guayasamin, Iain D Couzin, Noam Y Miller
An individual's behavioural phenotype is a combination of its unique behavioural propensities and its responsiveness to environmental variation, also known as behavioural plasticity. In social species, we must not only explore how individuals respond to variations in the physical environment but also how they react to changes in their social environment. A growing body of work has demonstrated that the behavioural heterogeneity of a group can alter its responsiveness, decision making, and fitness. Whether an individual is more or less extreme than a partner - what we term its 'relative personality' - may also alter individual behavioural responses...
October 11, 2016: Behavioural Processes
https://www.readbyqxmd.com/read/27503357/transcriptional-regulation-during-zygotic-genome-activation-in-zebrafish-and-other-anamniote-embryos
#10
J Wragg, F Müller
Embryo development commences with the fusion of two terminally differentiated haploid gametes into the totipotent fertilized egg, which through a series of major cellular and molecular transitions generate a pluripotent cell mass. The activation of the zygotic genome occurs during the so-called maternal to zygotic transition and prepares the embryo for zygotic takeover from maternal factors, in the control of the development of cellular lineages during differentiation. Recent advances in next generation sequencing technologies have allowed the dissection of the genomic and epigenomic processes mediating this transition...
2016: Advances in Genetics
https://www.readbyqxmd.com/read/27489962/an-optimized-small-tissue-handling-system-for-immunohistochemistry-and-in-situ-hybridization
#11
Giovanni Anthony, Ju-Ahng Lee
Recent development in 3D printing technology has opened an exciting possibility for manufacturing 3D devices on one's desktop. We used 3D modeling programs to design 3D models of a tissue-handling system and these models were "printed" in a stereolithography (SLA) 3D printer to create precision histology devices that are particularly useful to handle multiple samples with small dimensions in parallel. Our system has been successfully tested for in situ hybridization of zebrafish embryos. Some of the notable features include: (1) A conveniently transferrable chamber with 6 mesh-bottomed wells, each of which can hold dozens of zebrafish embryos...
2016: PloS One
https://www.readbyqxmd.com/read/27489304/zebrafish-p54-rna-helicases-are-cytoplasmic-granule-residents-that-are-required-for-development-and-stress-resilience
#12
Cecilia Zampedri, Maryana Tinoco-Cuellar, Samantha Carrillo-Rosas, Abigail Diaz-Tellez, Jose Luis Ramos-Balderas, Francisco Pelegri, Ernesto Maldonado
Stress granules are cytoplasmic foci that directly respond to the protein synthesis status of the cell. Various environmental insults, such as oxidative stress or extreme heat, block protein synthesis; consequently, mRNA will stall in translation, and stress granules will immediately form and become enriched with mRNAs. P54 DEAD box RNA helicases are components of RNA granules such as P-bodies and stress granules. We studied the expression, in cytoplasmic foci, of both zebrafish P54 RNA helicases (P54a and P54b) during development and found that they are expressed in cytoplasmic granules under both normal conditions and stress conditions...
October 15, 2016: Biology Open
https://www.readbyqxmd.com/read/27470083/dual-nrf2-paralogs-in-coho-salmon-and-their-antioxidant-response-element-targets
#13
Richard Ramsden, Evan P Gallagher
The transcription factor NFE2L2 (Nuclear Factor, Erythroid 2-Like 2, or NRF2) plays a key role in maintaining the redox state within cells. Characterization of this pathway has extended to fish, most notably zebrafish (Danio rerio), in which two paralogs of the transcription factor exist: Nrf2a, an activator, and Nrf2b, a negative regulator during embryogenesis. Only one ARE target has been thoroughly delineated in zebrafish, and this deviated from the canonical sequence derived from studies in mammals. In general, the mechanistic pathway has not been characterized in non-model aquatic organisms that are commonly exposed to environmental pollutants...
October 2016: Redox Biology
https://www.readbyqxmd.com/read/27464804/construction-of-the-inbred-strain
#14
Minori Shinya
Genetically homogeneous populations such as inbred strains are valuable experimental tools in various fields of biomedical analyses. In many animals, inbred strains are established by consecutive sib-pair mating for a minimum of 20 generations. As the generation proceeds, fitness of the population reduces usually. Therefore, in order to establish inbred strains, the important point is the selection of pairs in good condition at each generation. Here, I describe the procedure and tips for generating inbred strains in zebrafish...
2016: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27443940/a-scientist-s-guide-for-submitting-data-to-zfin
#15
D G Howe, Y M Bradford, A Eagle, D Fashena, K Frazer, P Kalita, P Mani, R Martin, S T Moxon, H Paddock, C Pich, S Ramachandran, L Ruzicka, K Schaper, X Shao, A Singer, S Toro, C Van Slyke, M Westerfield
The Zebrafish Model Organism Database (ZFIN; zfin.org) serves as the central repository for genetic and genomic data produced using zebrafish (Danio rerio). Data in ZFIN are either manually curated from peer-reviewed publications or submitted directly to ZFIN from various data repositories. Data types currently supported include mutants, transgenic lines, DNA constructs, gene expression, phenotypes, antibodies, morpholinos, TALENs, CRISPRs, disease models, movies, and images. The rapidly changing methods of genomic science have increased the production of data that cannot readily be represented in standard journal publications...
2016: Methods in Cell Biology
https://www.readbyqxmd.com/read/27420737/design-and-characterization-of-superpotent-bivalent-ligands-targeting-oxytocin-receptor-dimers-via-a-channel-like-structure
#16
Marta Busnelli, Gunnar Kleinau, Markus Muttenthaler, Stoytcho Stoev, Maurice Manning, Lucka Bibic, Lesley A Howell, Peter J McCormick, Simona Di Lascio, Daniela Braida, Mariaelvina Sala, G Enrico Rovati, Tommaso Bellini, Bice Chini
Dimeric/oligomeric states of G-protein coupled receptors have been difficult to target. We report here bivalent ligands consisting of two identical oxytocin-mimetics that induce a three order magnitude boost in G-protein signaling of oxytocin receptors (OTRs) in vitro and a 100- and 40-fold gain in potency in vivo in the social behavior of mice and zebrafish. Through receptor mutagenesis and interference experiments with synthetic peptides mimicking transmembrane helices (TMH), we show that such superpotent behavior follows from the binding of the bivalent ligands to dimeric receptors based on a TMH1-TMH2 interface...
August 11, 2016: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/27401757/repeatability-of-locomotor-performance-and-of-morphology-locomotor-performance-relationships
#17
Cara Conradsen, Jeffrey A Walker, Catherine Perna, Katrina McGuigan
There is good evidence that natural selection drives the evolution of locomotor performance, but the processes that generate among individual variation in locomotion, the substrate upon which selection acts, are relatively poorly understood. We measured prolonged swimming performance, Ucrit, and morphology in a large cohort (n=461) of wildtype zebrafish, Danio rerio, at ∼6 months and again at ∼9 months. Using mixed model analyses to estimate repeatability as the intraclass correlation coefficient, we determined that Ucrit was significantly repeatable (r = 0...
July 11, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27397519/neuromodulatory-regulation-of-behavioral-individuality-in-zebrafish
#18
Carlos Pantoja, Adam Hoagland, Elizabeth C Carroll, Vasiliki Karalis, Alden Conner, Ehud Y Isacoff
Inter-individual behavioral variation is thought to increase fitness and aid adaptation to environmental change, but the underlying mechanisms are poorly understood. We find that variation between individuals in neuromodulatory input contributes to individuality in short-term habituation of the zebrafish (Danio Rerio) acoustic startle response (ASR). ASR habituation varies greatly between individuals, but differences are stable over days and are heritable. Acoustic stimuli that activate ASR-command Mauthner cells also activate dorsal raphe nucleus (DRN) serotonergic neurons, which project to the vicinity of the Mauthner cells and their inputs...
August 3, 2016: Neuron
https://www.readbyqxmd.com/read/27318802/a-critical-evaluation-of-the-fish-early-life-stage-toxicity-test-for-engineered-nanomaterials-experimental-modifications-and-recommendations
#19
REVIEW
Benjamin J Shaw, Corin C Liddle, Kirsten M Windeatt, Richard D Handy
There are concerns that regulatory toxicity tests are not fit for purpose for engineered nanomaterials (ENMs) or need modifications. The aim of the current study was to evaluate the OECD 210 fish, early-life stage toxicity test for use with TiO2 ENMs, Ag ENMs, and MWCNT. Both TiO2 ENMS (≤160 mg l(-1)) and MWCNT (≤10 mg l(-1)) showed limited acute toxicity, whilst Ag ENMs were acutely toxic to zebrafish, though less so than AgNO3 (6-day LC50 values of 58.6 and 5.0 µg l(-1), respectively). Evidence of delayed hatching, decreased body length and increased muscle width in the tail was seen in fish exposed to Ag ENMs...
September 2016: Archives of Toxicology
https://www.readbyqxmd.com/read/27312825/effects-of-chronic-dietary-selenomethionine-exposure-on-the-visual-system-of-adult-and-f1-generation-zebrafish-danio-rerio
#20
Jason C Raine, Lise Lallemand, Connor M Pettem, David M Janz
The effects of chronic dietary selenomethionine (SeMet) exposure on the visual system of adult zebrafish and their progeny were investigated. Adult zebrafish were exposed to measured concentrations of 1.1 (control) and 10.3 µg Se/g dry mass as SeMet for 57 days, then encouraged to breed. Progeny were reared to swim-up and differences in mortality, eye size and visual behaviour were determined. Adult vision was also investigated using behavioural assays. Adults fed the SeMet-spiked diet exhibited significantly fewer positive reactions in the escape response assay when compared to controls...
September 2016: Bulletin of Environmental Contamination and Toxicology
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