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https://www.readbyqxmd.com/read/28107717/diclofenac-can-exhibit-estrogenic-modes-of-action-in-male-xenopus-laevis-and-affects-the-hypothalamus-pituitary-gonad-axis-and-mating-vocalizations
#1
Norah Johanna Efosa, Wibke Kleiner, Werner Kloas, Frauke Hoffmann
Diclofenac (DCF) is a non-steroidal analgesic and antiphlogistic. Due to its tremendous use, DCF can be found in the environment, especially in sewage, but also surface waters, ground and drinking water. Previous studies indicated that DCF can modulate the reproductive physiology of fish by altering the expression of important key enzymes of the hypothalamus-pituitary-gonad-axis (HPG-axis) and might act as an estrogenic endocrine disrupting chemical (EDC). Other studies, however, demonstrated that DCF does not exhibit any estrogenicity...
January 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28105797/a-new-species-of-genus-fejervarya-anura-dicroglossidae-from-northern-thailand
#2
Chatmongkon Suwannapoom, Zhi-Yong Yuan, Nikolay A Poyarkov, Fang Yan, Somboon Kamtaeja, Robert W Murphy, Jing Che
We describe a new species of frog in the dicroglossid genus Fejervarya from Ban Monjong, Omkoi District, Chiang Mai Province, northern Thailand. Analysis of DNA sequence data from the mitochondrial gene 16S, advertisement calls, and morphological distinctiveness support recognition of the new species. Matrilineal genealogy suggests that the new population from Chiang Mai is a sister taxon to the South Asian clade that includes F. syhadrensis, F. granosa, and F. pierrei. The new species, Fejervarya chiangmaiensissp...
November 18, 2016: Zool Res
https://www.readbyqxmd.com/read/28105509/variation-in-metabolite-profiles-of-amphibian-skin-bacterial-communities-across-elevations-in-the-neotropics
#3
Daniel Medina, Myra C Hughey, Matthew H Becker, Jenifer B Walke, Thomas P Umile, Elizabeth A Burzynski, Anthony Iannetta, Kevin P C Minbiole, Lisa K Belden
Both the structure and function of host-associated microbial communities are potentially impacted by environmental conditions, just as the outcomes of many free-living species interactions are context-dependent. Many amphibian populations have declined around the globe due to the fungal skin pathogen, Batrachochytrium dendrobatidis (Bd), but enivronmental conditions may influence disease dynamics. For instance, in Panamá, the most severe Bd outbreaks have occurred at high elevation sites. Some amphibian species harbor bacterial skin communities that can inhibit the growth of Bd, and therefore, there is interest in understanding whether environmental context could also alter these host-associated microbial communities in a way that might ultimately impact Bd dynamics...
January 19, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28100805/differences-in-mobility-at-the-range-edge-of-an-expanding-invasive-population-of-xenopus-laevis-in-the-west-of-france
#4
Vivien Louppe, Julien Courant, Anthony Herrel
Theoretical models predict that spatial sorting at the range edge of expanding populations should favor individuals with increased mobility relative to individuals at the center of the range. Despite the fact that empirical evidence for the evolution of locomotor performance at the range edge is rare, data on cane toads support this model. However, whether this can be generalized to other species remains largely unknown. Here, we provide data on locomotor stamina and limb morphology in individuals from two sites: one from the center and one from the periphery of an expanding population of the clawed frog Xenopus laevis in France where it was introduced about 30 years ago...
January 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28100792/evolutionary-history-of-the-asian-horned-frogs-megophryinae-integrative-approaches-to-timetree-dating-in-the-absence-of-a-fossil-record
#5
Stephen Mahony, Nicole M Foley, S D Biju, Emma C Teeling
Molecular dating studies typically need fossils to calibrate the analyses. Unfortunately, the fossil record is extremely poor or presently non-existent for many species groups, rendering such dating analysis difficult. One such group is the Asian horned frogs (Megophryinae). Sampling all generic nomina, we combined a novel ∼5kb dataset composed of four nuclear and three mitochondrial gene fragments to produce a robust phylogeny, with an extensive external morphological study to produce a working taxonomy for the group...
January 18, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28096431/activation-of-respiratory-muscles-does-not-occur-during-cold-submergence-in-bullfrogs-lithobates-catesbeianus
#6
Joseph M Santin, Lynn K Hartzler
Semiaquatic frogs may not breathe air for several months because they overwinter in ice-covered ponds. In contrast to many vertebrates that experience decreased motor performance after inactivity, respiratory motor function in bullfrogs, Lithobates catesbeianus, remains functional following cold-submergence. Unlike mammalian hibernators with unloaded limb muscles and inactive locomotor systems, respiratory mechanics of frogs counterintuitively allow for ventilatory maneuvers when submerged. Thus we hypothesized that bullfrogs generate respiratory motor patterns during cold-submergence to avoid disuse and preserve motor performance...
January 17, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28095647/new-generation-mass-spectrometry-expands-the-toolbox-of-cell-and-developmental-biology
#7
REVIEW
Camille Lombard-Banek, Erika P Portero, Rosemary M Onjiko, Peter Nemes
Systems cell biology understanding of development requires characterization of all the molecules produced in the biological system. Decades of research and new-generation sequencing provided functional information on key genes and transcripts. However, there is less information available on how differential gene expression translates into the domains of functionally important proteins, peptides, and metabolites, and how changes in these molecules impact development. Mass spectrometry (MS) is the current technology of choice for the detection and quantification of large numbers of proteins and metabolites, because it requires no use of antibodies, functional probes, or a priori knowledge of molecules produced in the system...
January 17, 2017: Genesis: the Journal of Genetics and Development
https://www.readbyqxmd.com/read/28095646/a-frog-s-view-of-ephrinb-signaling
#8
REVIEW
Yoo-Seok Hwang, Ira O Daar
Cell-cell and cell-substrate adhesion are essential to the proper formation and maintenance of tissue patterns during development, and deregulation of these processes can lead to invasion and metastasis of cancer cells. Cell surface adhesion and signaling molecules are key players in both normal development and cancer progression. One set of cell surface proteins, the Eph receptor tyrosine kinases and their membrane-bound ligands, ephrins, are significant regulators of these processes. During embryonic development, the Eph/ephrin signaling system is involved in cell-cell contact events that result in cell sorting and boundary formation between receptor and ligand bearing cells...
January 17, 2017: Genesis: the Journal of Genetics and Development
https://www.readbyqxmd.com/read/28095621/targeted-integration-of-genes-in-xenopus-tropicalis
#9
REVIEW
Zhaoying Shi, Dandan Tian, Huhu Xin, Jingru Lian, Xiaogang Guo, Yonglong Chen
With the successful establishment of both targeted gene disruption and integration methods in the true diploid frog Xenopus tropicalis, this excellent vertebrate genetic model now is making a unique contribution to modelling human diseases. Here we summarize our efforts on establishing homologous recombination-mediated targeted integration in Xenopus tropicalis, the usefulness and limitation of targeted integration via the homology-independent strategy, and future directions on how to further improve targeted gene integration in Xenopus tropicalis...
January 17, 2017: Genesis: the Journal of Genetics and Development
https://www.readbyqxmd.com/read/28095428/linking-ecology-and-epidemiology-to-understand-predictors-of-multi-host-responses-to-an-emerging-pathogen-the-amphibian-chytrid-fungus
#10
Stephanie S Gervasi, Patrick R Stephens, Jessica Hua, Catherine L Searle, Gisselle Yang Xie, Jenny Urbina, Deanna H Olson, Betsy A Bancroft, Virginia Weis, John I Hammond, Rick A Relyea, Andrew R Blaustein
Variation in host responses to pathogens can have cascading effects on populations and communities when some individuals or groups of individuals display disproportionate vulnerability to infection or differ in their competence to transmit infection. The fungal pathogen, Batrachochytrium dendrobatidis (Bd) has been detected in almost 700 different amphibian species and is implicated in numerous global amphibian population declines. Identifying key hosts in the amphibian-Bd system-those who are at greatest risk or who pose the greatest risk for others-is challenging due in part to many extrinsic environmental factors driving spatiotemporal Bd distribution and context-dependent host responses to Bd in the wild...
2017: PloS One
https://www.readbyqxmd.com/read/28089841/the-birth-of-aposematism-high-phenotypic-divergence-and-low-genetic-diversity-in-a-young-clade-of-poison-frogs
#11
Rebecca Dent Tarvin, Emily A Powell, Juan C Santos, Santiago R Ron, David C Cannatella
Rapid radiation coupled with low genetic divergence often hinders species delimitation and phylogeny estimation even if putative species are phenotypically distinct. Some aposematic species, such as poison frogs (Dendrobatidae), have high levels of intraspecific color polymorphism, which can lead to overestimation of species when phenotypic divergence primarily guides species delimitation. We explored this possibility in the youngest origin of aposematism (3-7 MYA) in poison frogs, Epipedobates, by comparing genetic divergence with color and acoustic divergence...
January 13, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28089430/high-variability-of-expression-profiles-of-homeologous-genes-for-wnt-hh-notch-and-hippo-signaling-pathways-in-xenopus-laevis
#12
Tatsuo Michiue, Takayoshi Yamamoto, Yuuri Yasuoka, Toshiyasu Goto, Takafumi Ikeda, Kei Nagura, Takuya Nakayama, Masanori Taira, Tsutomu Kinoshita
Cell signaling pathways, such as Wnt, Hedgehog (Hh), Notch, and Hippo, are essential for embryogenesis, organogenesis, and tissue homeostasis. In this study, we analyzed 415 genes involved in these pathways in the allotetraploid frog, Xenopus laevis. Most genes are retained in two subgenomes called L and S (193 homeologous gene pairs and 29 singletons). This conservation rate of homeologs is much higher than that of all genes in the X. laevis genome (86.9% vs 60.2%). Among singletons, 24 genes are retained in the L subgenome, a rate similar to the average for all genes (82...
January 12, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28081430/amphibian-xenopus-laevis-tadpoles-and-adult-frogs-mount-distinct-interferon-responses-to-the-frog-virus-3-ranavirus
#13
Emily S Wendel, Amulya Yaparla, Daphne V Koubourli, Leon Grayfer
Infections of amphibians by Frog Virus 3 (FV3) and other ranavirus genus members are significantly contributing to the amphibian declines, yet much remains unknown regarding amphibian antiviral immunity. Notably, amphibians represent an important step in the evolution of antiviral interferon (IFN) cytokines as they are amongst the first vertebrates to possess both type I and type III IFNs. Accordingly, we examined the roles of type I and III IFNs in the skin of FV3-challenged amphibian Xenopus laevis) tadpoles and adult frogs...
January 9, 2017: Virology
https://www.readbyqxmd.com/read/28080918/high-prevalence-of-intestinal-adenocarcinoma-in-a-captive-population-of-amazon-milk-frog-trachycephalus-resinifictrix
#14
Javier López, Alberto R Barbón, Juliet Smithyman, Matt Goetz, Rachel E Marschang, Akbar Dastjerdi, Mark F Stidworthy
:  A series of eight cases of intestinal adenocarcinoma in Amazon milk frog (Trachycephalus resinifictrix) is described. All cases presented with signs of inappetence and weight loss, and evidence of large intestinal distention on gross postmortem, with six of the eight cases showing a grossly visible large intestinal mass. Histologic examination identified the mass as an intestinal adenocarcinoma in all cases. No specific etiologic agent could be identified. This is the first report of neoplasia in the Amazon milk frog, and the first reported series of amphibian gastrointestinal neoplasia...
December 2016: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28074559/effects-of-traffic-noise-on-tree-frog-stress-levels-immunity-and-color-signaling
#15
Mathieu Troïanowski, Nathalie Mondy, Adeline Dumet, Caroline Arcanjo, Thierry Lengagne
During the last decade, many studies have focused on the detrimental effects of noise pollution on acoustic communication. Surprisingly, while it is known that noise exposure strongly influences health in humans, studies on wildlife remain scarce. In order to gain insight into the consequences of traffic noise exposure, we experimentally manipulated traffic noise exposure as well as the endocrine status of animals to investigate physiological and phenotypic consequences of noise pollution in an anuran species...
January 11, 2017: Conservation Biology: the Journal of the Society for Conservation Biology
https://www.readbyqxmd.com/read/28073389/the-distribution-of-echinostome-parasites-in-ponds-and-implications-for-larval-anuran-survival
#16
John A Marino, Manja P Holland, Earl E Werner
Parasites can influence host population dynamics, community composition and evolution. Prediction of these effects, however, requires an understanding of the influence of ecological context on parasite distributions and the consequences of infection for host fitness. We address these issues with an amphibian - trematode (Digenea: Echinostomatidae) host-parasite system. We initially performed a field survey of trematode infection in first (snail) and second (larval green frog, Rana clamitans) intermediate hosts over 5 years across a landscape of 23 ponds in southeastern Michigan...
January 11, 2017: Parasitology
https://www.readbyqxmd.com/read/28073381/immediate-and-lag-effects-of-pesticide-exposure-on-parasite-resistance-in-larval-amphibians
#17
Katherine M Pochini, Jason T Hoverman
Across host-parasite systems, there is evidence that pesticide exposure increases parasite loads and mortality following infection. However, whether these effects are driven by reductions in host resistance to infection or slower rates of parasite clearance is often unclear. Using controlled laboratory experiments, we examined the ability of larval northern leopard frogs (Lithobates pipiens) and American toads (Anaxyrus americanus) to resist and clear trematode (Echinoparyphium sp.) infections following exposure to the insecticide carbaryl...
January 11, 2017: Parasitology
https://www.readbyqxmd.com/read/28072492/identification-and-characterization-of-novel-host-defense-peptides-from-the-skin-secretion-of-the-fungoid-frog-hydrophylax-bahuvistara-anura-ranidae
#18
T V Vineeth Kumar, R Asha, G Shyla, Sanil George
Two novel peptides (brevinin1 HYba1 and brevinin1 HYba2) were identified from the skin secretion of the frog Hydrophylax bahuvistara, endemic to Western Ghats, India, and their amino acid sequences were confirmed using cDNA cloning and LC/MS/MS. Antibacterial, hemolytic and cytotoxic activities of brevinin1 peptides and their synthetic analogs (amidated C-terminus) were investigated and compared. All the peptides except the acidic forms showed antibacterial activity against all tested Gram -positive and negative bacteria...
January 10, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28071651/marine-origin-of-retroviruses-in-the-early-palaeozoic-era
#19
Pakorn Aiewsakun, Aris Katzourakis
Very little is known about the ancient origin of retroviruses, but owing to the discovery of their ancient endogenous viral counterparts, their early history is beginning to unfold. Here we report 36 lineages of basal amphibian and fish foamy-like endogenous retroviruses (FLERVs). Phylogenetic analyses reveal that ray-finned fish FLERVs exhibit an overall co-speciation pattern with their hosts, while amphibian FLERVs might not. We also observe several possible ancient viral cross-class transmissions, involving lobe-finned fish, shark and frog FLERVs...
January 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28070634/increasing-the-reference-populations-for-the-55-aisnp-panel-the-need-and-benefits
#20
Andrew J Pakstis, Longli Kang, Lijun Liu, Zhiying Zhang, Tianbo Jin, Elena L Grigorenko, Frank R Wendt, Bruce Budowle, Sibte Hadi, Mariam Salam Al Qahtani, Niels Morling, Helle Smidt Mogensen, Goncalo E Themudo, Usha Soundararajan, Haseena Rajeevan, Judith R Kidd, Kenneth K Kidd
Ancestry inference for an individual can only be as good as the reference populations with allele frequency data on the SNPs being used. If the most relevant ancestral population(s) does not have data available for the SNPs studied, then analyses based on DNA evidence may indicate a quite distantly related population, albeit one among the more closely related of the existing reference populations. We have added reference population allele frequencies for 14 additional population samples (with >1100 individuals studied) to the 125 population samples previously published for the Kidd Lab 55 AISNP panel...
January 9, 2017: International Journal of Legal Medicine
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