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https://www.readbyqxmd.com/read/28239035/characterization-of-membrane-progestin-receptor-%C3%AE-mpr%C3%AE-of-the-medaka-and-role-in-the-induction-of-oocyte-maturation
#1
Shimi Rani Roy, Jun Wang, Md Rubel Rana, Mikiko Nakashima, Toshinobu Tokumoto
Oocyte maturation in medaka is induced by the maturation-inducing hormone (MIH) via its membrane receptor. The most likely candidates for the membrane receptor are membrane progestin receptors (mPRs). In order to characterize the mPRα subtype of medaka, a human cell line expressing the mPRα gene of medaka was established and its steroid binding property was assessed. The α subtype exhibited high binding affinity for 17,20β-DHP, the MIH in medaka. Treatment with a morpholino antisense oligonucleotide to mPRα blocked oocyte maturation in vivo...
2017: Biomedical Research
https://www.readbyqxmd.com/read/28230233/establishment-and-growth-responses-of-nile-tilapia-embryonic-stem-like-cell-lines-under-feeder-free-condition
#2
Zhenhua Fan, Linyan Liu, Xiaohuan Huang, Yang Zhao, Linyan Zhou, Deshou Wang, Jing Wei
Embryonic stem (ES) cells provide an invaluable tool for molecular analysis of vertebrate development and a bridge linking genomic manipulations in vitro and functional analysis of target genes in vivo. Work towards fish ES cells so far has focused on zebrafish (Danio renio) and medaka (Oryzias latipes). Here we describe the derivation, pluripotency, differentiation and growth responses of ES cell lines from Nile tilapia (Oreochromis niloticus), a world-wide commercial farmed fish. These cell lines, designated as TES1-3, were initiated from blastomeres of Nile tilapia middle blastula embryos (MBE)...
February 23, 2017: Development, Growth & Differentiation
https://www.readbyqxmd.com/read/28229564/diversification-of-hox-gene-clusters-in-osteoglossomorph-fish-in-comparison-to-other-teleosts-and-the-spotted-gar-outgroup
#3
Kyle J Martin, Peter W H Holland
An ancient genome duplication (TGD or 3R) occurred in teleost fish after divergence from the lineage leading to gar. This genome duplication is shared by the three extant teleost lineages: Osteoglossomorpha (bony-tongues), Elopomorpha (eels and tarpons), and Clupeocephala (a large clade including salmon, carp, medaka, zebrafish, cichlids, pufferfish, stickleback, and ∼26,000 other species). After TGD, different clupeocephalan species retained different gene duplicates; this is seen clearly in Hox gene clusters but extends to all genes...
February 23, 2017: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
https://www.readbyqxmd.com/read/28222863/tributyltin-exposure-increases-mortality-of-nodavirus-infected-japanese-medaka-oryzias-latipes-larvae
#4
Shin-Ichi Kitamura, Masaki Akizuki, Jun-Young Song, Kei Nakayama
We investigated the effect of combined exposure to nodavirus infection and TBT on medaka (Oryzias latipes). Medaka larvae were infected by immersion in medium containing nodavirus at titers of 10(2.5), 10(3.5), or 10(4.5) TCID50/mL. Infected fish then were exposed to TBT at 0, 0.17, 0.52, 1.6, or 4.7μg/L. Of the 12 groups exposed to both stressors, the mortalities of 6 (10(2.5) TCID50/mL+0.52, 1.6, or 4.7μg/L, 10(3.5) TCID50/mL+4.7μg/L and 10(4.5) TCID50/mL+1.6 or 4.7μg/L) were significantly higher than that of each TBT control...
February 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28215820/the-use-of-fish-models-to-study-human-neurological-disorders
#5
Hideaki Matsui
Small teleost fish including zebrafish and medaka have been used as animal models in basic science research due to the relative ease of handling and transparency during embryogenesis. Current advances in genetic engineering and progress in disease genetics allowed utilization of these fish to study neurological diseases and psychiatric disorders. This review summarizes the advantages and disadvantages of using fish for neuropsychiatric research using primarily our own studies as examples. We discuss how fish belong to a class of vertebrates, are feasible for imaging, and include diverse species with multiple research possibilities yet to be discovered...
February 16, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/28214734/developmental-toxicity-and-molecular-responses-of-marine-medaka-oryzias-melastigma-embryos-to-ciguatoxin-p-ctx-1-exposure
#6
Meng Yan, Priscilla T Y Leung, Jack C H Ip, Jin-Ping Cheng, Jia-Jun Wu, Jia-Rui Gu, Paul K S Lam
Ciguatoxins are produced by toxic benthic dinoflagellates and cause ciguatera fish poisoning worldwide, but the toxic effects on developing marine fish have not been well investigated. The Pacific ciguatoxin (P-CTX-1), is a potent sodium channel agonist, which is one of the most toxic members among all CTXs. This study evaluated the toxic effects of microinjecting purified Pacific ciguatoxin-1 (P-CTX-1) on embryonic development of marine medaka Oryzias melastigma. A lower 96h-LD50 value was estimated for eleuthero-embryos (1...
February 10, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28212432/genetically-encoded-ratiometric-fluorescent-thermometer-with-wide-range-and-rapid-response
#7
Masahiro Nakano, Yoshiyuki Arai, Ippei Kotera, Kohki Okabe, Yasuhiro Kamei, Takeharu Nagai
Temperature is a fundamental physical parameter that plays an important role in biological reactions and events. Although thermometers developed previously have been used to investigate several important phenomena, such as heterogeneous temperature distribution in a single living cell and heat generation in mitochondria, the development of a thermometer with a sensitivity over a wide temperature range and rapid response is still desired to quantify temperature change in not only homeotherms but also poikilotherms from the cellular level to in vivo...
2017: PloS One
https://www.readbyqxmd.com/read/28202469/establishment-and-maintenance-of-sexual-preferences-that-cause-a-reproductive-isolation-between-medaka-strains-in-close-association
#8
Mayuka Ikawa, Emi Ohya, Hiroka Shimada, Makiko Kamijo, Shoji Fukamachi
Animals choose reproductive partners based on their sexual preferences which are established at a certain time point before, during, or after sexual maturation. The preferences are often divergent within a species, which suppresses gene flow between populations and may promote speciation. There are two strains of medaka (Oryzias latipes) that differ by a single transgene and mate assortatively depending on skin color. Here, we demonstrate that symmetrically biased (mutually exclusive) sexual preferences are (1) gradually established during growth depending on skin color and the color of surrounding fish, (2) strong enough to minimize gene flow between the strains at a population level, and (3) inflexibly retained after sexual maturation, even after weeks of daily mating with partners of the other strain...
February 15, 2017: Biology Open
https://www.readbyqxmd.com/read/28198566/fish-short-term-reproduction-assay-fstra-with-atrazine-and-the-japanese-medaka-oryzias-latipes
#9
Alan J Hosmer, Suzanne Z Schneider, Julie C Anderson, Loren D Knopper, Richard A Brain
Breeding groups of Japanese medaka (Oryzias latipes) were exposed to atrazine at measured concentrations of 0.6, 5.5, and 53 µg/L for 35 d. Evaluated endpoints included survival, fecundity, fertility, growth (weight and length), behavior, secondary sex characteristics (anal fin papillae), gonad histopathology, and hepatic vitellogenin. No statistically significant effects of atrazine exposure on survival and growth of medaka were noted during the test, and mean survival was ≥97.5% in all treatment groups on Day 35...
February 15, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28181357/post-embryonic-fish-brain-proliferation-zones-exhibit-neuroepithelial-type-gene-expression-profile
#10
E Dambroise, M Simion, T Bourquard, S Bouffard, B Rizzi, Y Jaszczyszyn, M Bourge, P Affaticati, A Heuzé, J Jouralet, J Edouard, S Brown, C Thermes, A Poupon, E Reiter, F Sohm, F Bourrat, J-S Joly
In mammals, neuroepithelial cells play an essential role in embryonic neurogenesis, whereas glial stem cells are the principal source of neurons at post-embryonic stages. By contrast, neuroepithelial-like stem/progenitor (NE) cells have been shown to be present throughout life in teleosts. We used 3-dimensional (3D) reconstructions of cleared transgenic wdr12:GFP medaka brains to demonstrate that this cell type is widespread in juvenile and to identify new regions containing NE cells. We established the gene expression profile of optic tectum (OT) NE cells by cell sorting followed by RNA-seq...
February 9, 2017: Stem Cells
https://www.readbyqxmd.com/read/28166717/protanopia-red-color-blindness-in-medaka-a-simple-system-for-producing-color-blind-fish-and-testing-their-spectral-sensitivity
#11
Noriko Homma, Yumi Harada, Tamaki Uchikawa, Yasuhiro Kamei, Shoji Fukamachi
BACKGROUND: Color perception is important for fish to survive and reproduce in nature. Visual pigments in the retinal photoreceptor cells are responsible for receiving light stimuli, but the function of the pigments in vivo has not been directly investigated in many animals due to the lack of color-blind lines and appropriate color-perception tests. METHODS: In this study, we established a system for producing color-blind fish and testing their spectral sensitivity...
February 6, 2017: BMC Genetics
https://www.readbyqxmd.com/read/28160040/acute-exposure-to-17%C3%AE-ethinylestradiol-alters-aggressive-behavior-of-mosquitofish-gambusia-affinis-toward-japanese-medaka-oryzias-latipes
#12
Hieu M Dang, Yoshihiko Inagaki, Yuta Yamauchi, Takaaki Kurihara, Cong H Vo, Yutaka Sakakibara
Behavior of the mosquitofish (Gambusia affinis) toward the Japanese medaka (Oryzias latipes) was tested under exposure to environmental 17α-ethinylestradiol (EE2), a synthetic derivative of natural estrogen, estradiol. The mosquitofish were exposed to EE2 at different concentrations-0, 0.5, 5.0, and 50.0 ng/L-for 2 days, before their behavioral changes toward the medaka were observed. Results indicate that female mosquitofish became more aggressive at the high level of EE2 (50 ng/L), in terms of how persistently they attempted to approach the medaka...
February 3, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28157544/the-embryotoxicity-of-zno-nanoparticles-to-marine-medaka-oryzias-melastigma
#13
Yi Cong, Fei Jin, Juying Wang, Jingli Mu
The negative effects of metal oxide nanoparticles on aquatic environment and organisms have caused much concern. In this study, the embryotoxicity of zinc oxide nanoparticles (ZnO NP) to marine medaka, Oryzias melastigma, was explored and compared with that of aqueous Zn (ZnSO4·7H2O). The Zn(2+) released from ZnO NP in artificial seawater at exposure concentrations was also measured. Results showed that zinc ion release percentage (%) decreased with increasing concentration, which was 44%, 41% and 25% at 0...
January 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28144638/morphometric-characteristics-and-fin-dimorphism-between-male-and-female-on-the-marine-medaka-oryzias-dancena
#14
Jae Hyun Im, Hyun Woo Gil, Tae Ho Lee, Hee Jeong Kong, Cheol Min Ahn, Bong Seok Kim, Dong Soo Kim, Chang Ik Zhang, In-Seok Park
Sexual dimorphism is the most conspicuous difference between the sexes. This study examines possible sexual dimorphism and the relative growth patterns of morphometric characteristics in the marine medaka, Oryzias dancena for their potential to help differentiate between males and females of this species. The von Bertalanffy growth parameters estimated by a non-linear regression method were L∞=30.2 mm, K=3.22/year, and τ0=-0.05. All 18 characteristics measured showed a difference between males and females from 70 days after hatching...
December 2016: Balsaeng'gwa Saengsig
https://www.readbyqxmd.com/read/28144636/comparative-study-of-growth-and-gonad-maturation-in-diploid-and-triploid-marine-medaka-oryzias-dancena
#15
In-Seok Park, Hyun Woo Gil, Tae Ho Lee, Yoon Kwon Nam, Dong Soo Kim
The marine medaka, Oryzias dancena is a suitable sample as a laboratory animal because it has a small size and clearly distinguishes between female and male. Data on the growth and maturity of the diploid and triploid sea cucurbit species suitable for laboratory animals are very useful for studying other species. Triploidy was induced in the marine medaka by cold shock treatment (0°C) of fertilized eggs for 45 min, applied two minutes after fertilization. The diploid and triploid male fish were larger than their female counterparts (P<0...
December 2016: Balsaeng'gwa Saengsig
https://www.readbyqxmd.com/read/28132693/biallelic-mutation-of-arhgef18-involved-in-the-determination-of-epithelial-apicobasal-polarity-causes-adult-onset-retinal-degeneration
#16
Gavin Arno, Keren J Carss, Sarah Hull, Ceniz Zihni, Anthony G Robson, Alessia Fiorentino, Alison J Hardcastle, Graham E Holder, Michael E Cheetham, Vincent Plagnol, Anthony T Moore, F Lucy Raymond, Karl Matter, Maria S Balda, Andrew R Webster
Mutations in more than 250 genes are implicated in inherited retinal dystrophy; the encoded proteins are involved in a broad spectrum of pathways. The presence of unsolved families after highly parallel sequencing strategies suggests that further genes remain to be identified. Whole-exome and -genome sequencing studies employed here in large cohorts of affected individuals revealed biallelic mutations in ARHGEF18 in three such individuals. ARHGEF18 encodes ARHGEF18, a guanine nucleotide exchange factor that activates RHOA, a small GTPase protein that is a key component of tight junctions and adherens junctions...
February 2, 2017: American Journal of Human Genetics
https://www.readbyqxmd.com/read/28129920/sex-dependent-telomere-shortening-telomerase-activity-and-oxidative-damage-in-marine-medaka-oryzias-melastigma-during-aging
#17
Bill Wp Yip, Helen Ol Mok, Drew R Peterson, Miles T Wan, Y Taniguchi, Wei Ge, Doris Wt Au
Marine medaka Oryzias melastigma at 4months (young), 8months (middle-aged) and 12months old (senior) were employed to determine age-associated change of sex ratios, sex hormones, telomere length (TL), telomerase activity (TA), telomerase transcription (omTERT) and oxidative damage in the liver. Overall, O. melastigma exhibited gradual senescence, sex differences in longevity (F>M), TL (F>M) and oxidative damage (F<M) during aging. In females, the plasma E2 level was positively correlated with TL (TRF>5kb), TA and omTERT expression (p≤0...
January 24, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28129851/small-teleost-fish-provide-new-insights-into-human-skeletal-diseases
#18
P E Witten, M P Harris, A Huysseune, C Winkler
Small teleost fish such as zebrafish and medaka are increasingly studied as models for human skeletal diseases. Efficient new genome editing tools combined with advances in the analysis of skeletal phenotypes provide new insights into fundamental processes of skeletal development. The skeleton among vertebrates is a highly conserved organ system, but teleost fish and mammals have evolved unique traits or have lost particular skeletal elements in each lineage. Several unique features of the skeleton relate to the extremely small size of early fish embryos and the small size of adult fish used as models...
2017: Methods in Cell Biology
https://www.readbyqxmd.com/read/28117826/drug-treatment-and-in-vivo-imaging-of-osteoblast-osteoclast-interactions-in-a-medaka-fish-osteoporosis-model
#19
Tingsheng Yu, Christoph Winkler
Bone-forming osteoblasts interact with bone-resorbing osteoclasts to coordinate the turnover of bone matrix and to control skeletal homeostasis. Medaka and zebrafish larvae are widely used to analyze the behavior of bone cells during bone formation, degeneration, and repair. Their optical clarity allows the visualization of fluorescently labeled bone cells and fluorescent dyes bound to the mineralized skeletal matrix. Our lab has generated transgenic medaka fish that express the osteoclast-inducing factor Receptor Activator of Nuclear-factor κB Ligand (RANKL) under the control of a heat shock-inducible promoter...
January 1, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28111290/suppression-of-neu1-sialidase-delays-the-absorption-of-yolk-sac-in-medaka-oryzias-latipes-accompanied-with-the-accumulation-of-%C3%AE-2-3-sialo-glycoproteins
#20
Sena Ryuzono, Ryo Takase, Yuko Kamada, Takanori Ikenaga, Petros Kingstone Chigwechokha, Masaharu Komatsu, Kazuhiro Shiozaki
Sialidase catalyzes the removal of sialic acids from glycoconjugates. Recently, medaka sialidase Neu1 has been cloned and its enzymatic properties were investigated. Although enzymatic properties of this sialidase, such as optimal pH and substrate specificity, exhibits high similarity with human NEU1, Neu1 physiological functions in fish are still unclear. Here, to understand Neu1 significance in medaka embryogenesis, sialidase translation knockdown was carried out with one-cell stage fertilized egg using morpholino oligo injection...
January 19, 2017: Biochimie
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