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https://www.readbyqxmd.com/read/28923289/impact-of-ocean-acidification-on-the-early-development-and-escape-behavior-of-marine-medaka-oryzias-melastigma
#1
Xiaojie Wang, Lulu Song, Yi Chen, Haoyu Ran, Jiakun Song
Ocean acidification is predicted to affect a wide diversity of marine organisms. However, no studies have reported the effects of ocean acidification on Indian Ocean fish. We have used the Indian Ocean medaka (Oryzias melastigma) as a model species for a marine fish that lives in coastal waters. We investigated the impact of ocean acidification on the embryonic development and the stereotyped escape behavior (mediated by the Mauthner cell) in newly hatched larvae. Newly fertilized eggs of medaka were reared in seawater at three different partial pressures of carbon dioxide (pCO2): control at 450 μatm, moderate at 1160 μatm, and high at 1783 μatm...
September 6, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28919301/prostaglandins-in-teleost-ovulation-a-review-of-the-roles-with-a-view-to-comparison-with-prostaglandins-in-mammalian-ovulation
#2
REVIEW
Takayuki Takahashi, Akane Hagiwara, Katsueki Ogiwara
Prostaglandins are well known to be central regulators of vertebrate ovulation. Studies addressing the role of prostaglandins in mammalian ovulation have established that they are involved in the processes of oocyte maturation and cumulus oocyte complex expansion. In contrast, despite the first indication of the role of prostaglandins in teleost ovulation appearing 40 years ago, the mechanistic background of their role has long been unknown. However, studies conducted on medaka over the past decade have provided valuable information...
September 15, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28916771/complete-fusion-of-a-transposon-and-herpesvirus-created-the-teratorn-mobile-element-in-medaka-fish
#3
Yusuke Inoue, Tomonori Saga, Takumi Aikawa, Masahiko Kumagai, Atsuko Shimada, Yasushi Kawaguchi, Kiyoshi Naruse, Shinichi Morishita, Akihiko Koga, Hiroyuki Takeda
Mobile genetic elements (e.g., transposable elements and viruses) display significant diversity with various life cycles, but how novel elements emerge remains obscure. Here, we report a giant (180-kb long) transposon, Teratorn, originally identified in the genome of medaka, Oryzias latipes. Teratorn belongs to the piggyBac superfamily and retains the transposition activity. Remarkably, Teratorn is largely derived from a herpesvirus of the Alloherpesviridae family that could infect fish and amphibians. Genomic survey of Teratorn-like elements reveals that some of them exist as a fused form between piggyBac transposon and herpesvirus genome in teleosts, implying the generality of transposon-herpesvirus fusion...
September 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28910659/effects-of-triphenyltin-on-reproduction-in-japanese-medaka-oryzias-latipes-across-two-generations
#4
Yoshifumi Horie, Haruna Watanabe, Hitomi Takanobu, Yoshiko Shigemoto, Takahiro Yamagishi, Taisen Iguchi, Norihisa Tatarazako
Triphenyltin (TPT) is an organotin compound used in marine anti-fouling coatings to prevent the attachment and growth of marine organisms, and it has negative effects on aquatic organisms. TPT is still detected at low concentrations, although its use has been prohibited at least in the European Community and is restricted in Japan as well. Studies using Japanese medaka (Oryzias latipes) indicate that TPT has the potential to inhibit reproduction. Although TPT is detected in many aquatic ecosystems, the multi-generational impact of TPT remains unknown...
August 31, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28903904/insights-of-sex-determination-and-differentiation-from-medaka-as-a-teleost-model
#5
Yi Kang, Gui-Jun Guan, Yun-Han Hong
The mechanisms of sex determination and differentiation in fish are highly divergent with a broad range of gonadal differentiation types from hermaphroditism to gonochorism. Multiple triggers regulate the process of sexual differentiation including genetic or environmental factors (temperature, light, hormones and/or pH value, etc.). In recent years, with the advances of molecular technologies and genetic engineering approaches, there are significant breakthroughs in identifying the master genes of vertebrate sex determination and differentiation...
June 20, 2017: Yi Chuan, Hereditas
https://www.readbyqxmd.com/read/28900124/using-crispr-cas9-mediated-gene-editing-to-further-explore-growth-and-trade-off-effects-in-myostatin-mutated-f4-medaka-oryzias-latipes
#6
Ying-Chun Yeh, Masato Kinoshita, Tze Hann Ng, Yu-Hsuan Chang, Shun Maekawa, Yi-An Chiang, Takashi Aoki, Han-Ching Wang
Myostatin (MSTN) suppresses skeletal muscle development and growth in mammals, but its role in fish is less well understood. Here we used CRISPR/Cas9 to mutate the MSTN gene in medaka (Oryzias latipes) and evaluate subsequent growth performance. We produced mutant F0 fish that carried different frameshifts in the OlMSTN coding sequence and confirmed the heritability of the mutant genotypes to the F1 generation. Two F1 fish with the same heterozygous frame-shifted genomic mutations (a 22 bp insertion in one allele; a 32 bp insertion in the other) were then crossbred to produce subsequent generations (F2~F5)...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28899668/the-sp7-gene-is-required-for-maturation-of-osteoblast-linage-cells-in-medaka-oryzias-latipes-vertebral-column-development
#7
Yuki Azetsu, Keiji Inohaya, Yoshiro Takano, Masato Kinoshita, Mai Tasaki, Akira Kudo
Sp7 is a zinc finger transcription factor that is essential for osteoblast differentiation in mammals. To verify the characteristic features of osteoblast-lineage cells in teleosts, we established medaka sp7 mutants using a transcription activator-like effector nuclease (TALEN) genome editing system. These mutants showed severe defects in the formation of skeletal structures. In particular, the neural and the hemal arches were not formed, although the chordal centra were formed. Analysis of the transgenic medaka revealed that sp7 mutant had normal distribution of type X collagen a1 a (col10a1a)-positive osteoblast-like cells around the centrum and at the proximal region of the vertebral arch...
September 9, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28882797/modification-of-the-plasma-complement-protein-profile-by-exogenous-estrogens-is-indicative-of-a-compromised-immune-competence-in-marine-medaka-oryzias-melastigma
#8
Miao Dong, Frauke Seemann, Joseph L Humble, Yimin Liang, Drew R Peterson, Rui Ye, Honglin Ren, Hui-Su Kim, Jae-Seong Lee, Doris W T Au, Yun Wah Lam
Growing evidence suggests that the immune system of teleost is vulnerable to xenoestrogens, which are ubiquitous in the marine environment. This study detected and identified the major circulatory immune proteins deregulated by 17α-ethinylestradiol (EE2), which may be linked to fish susceptibility to pathogens in the marine medaka, Oryzias melastigma. Fish immune competence was determined using a host resistance assay to pathogenic bacteria Edwardsiella tarda. Females were consistently more susceptible to infection-induced mortality than males...
September 4, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28871522/the-acute-toxicity-of-bisphenol-a-and-lignin-derived-bisphenol-in-algae-daphnids-and-japanese-medaka
#9
Dan Li, Ran Bi, Hongxing Chen, Lei Mu, Lina Zhang, Qin Chen, Haibo Xie, Yongju Luo, Lingtian Xie
Risk assessing newly synthesized chemicals prior to their applications is extremely important, if we want to ensure substitution of risky chemicals with more benign ones. During the past two decades, many analogs of bisphenol A (BPA) have been manufactured, while their toxicity remains less studied. The aim of this study was to compare the acute toxicity of a synthesized lignin-derived BPA (LD-BP) with that of BPA in representative aquatic organisms including two algal species (Chlorella pyrenoidosa and Scenedesmus obliquus), a cladoceran species (Daphnia magna), and the Japanese medaka (Oryzias latipes)...
September 4, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28871081/dynamic-plasticity-in-phototransduction-regulates-seasonal-changes-in-color-perception
#10
Tsuyoshi Shimmura, Tomoya Nakayama, Ai Shinomiya, Shoji Fukamachi, Masaki Yasugi, Eiji Watanabe, Takayuki Shimo, Takumi Senga, Toshiya Nishimura, Minoru Tanaka, Yasuhiro Kamei, Kiyoshi Naruse, Takashi Yoshimura
To cope with seasonal changes in the environment, organisms adapt their physiology and behavior. Although color perception varies among seasons, the underlying molecular basis and its physiological significance remain unclear. Here we show that dynamic plasticity in phototransduction regulates seasonal changes in color perception in medaka fish. Medaka are active and exhibit clear phototaxis in conditions simulating summer, but remain at the bottom of the tank and fail to exhibit phototaxis in conditions simulating winter...
September 4, 2017: Nature Communications
https://www.readbyqxmd.com/read/28866280/estrogen-alters-gonadal-soma-derived-factor-gsdf-foxl2-expression-levels-in-the-testes-associated-with-testis-ova-differentiation-in-adult-medaka-oryzias-latipes
#11
Tohru Kobayashi, Ayaka Chiba, Tadashi Sato, Taijun Myosho, Jun Yamamoto, Tetsuro Okamura, Yuta Onishi, Mitsuru Sakaizumi, Satoshi Hamaguchi, Taisen Iguchi, Yoshifumi Horie
Testis-ova differentiation in sexually mature male medaka (Oryzias latipes) is easily induced by estrogenic chemicals, indicating that spermatogonia persist in sexual bipotentiality, even in mature testes in medaka. By contrast, the effects of estrogen on testicular somatic cells associated with testis-ova differentiation in medaka remain unclear. In this study, we focused on the dynamics of sex-related genes (Gsdf, Dmrt1, and Foxl2) expressed in Sertoli cells in the mature testes of adult medaka during estrogen-induced testis-ova differentiation...
August 22, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28864068/y-linked-idmrt1-paralogue-idmy-in-the-eastern-spiny-lobster-sagmariasus-verreauxi-the-first-invertebrate-sex-linked-dmrt
#12
Jennifer C Chandler, Quinn P Fitzgibbon, Greg Smith, Abigail Elizur, Tomer Ventura
Sex determination pathways are extensively diverse across species, with the master sex-determinants being the most variable element. Despite this, there is a family of DM-domain transcription factors (Dmrts), which hold a highly conserved function in sexual development. This work is the first to describe a heterogametic sex-linked Dmrt in an invertebrate species, the Eastern spiny lobster, Sagmariasus verreauxi. We have termed the Y-linked, truncated paralogue of the autosomal iDmrt1, Sv-iDMY. Considering the master sex-determining function of both DMY in medaka and DM-W in frog, we hypothesised a similar function of Sv-iDMY...
August 29, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28857258/summary-of-the-development-the-us-environmental-protection-agency-s-medaka-extended-one-generation-reproduction-test-meogrt-using-data-from-9-multigenerational-medaka-tests
#13
Kevin Flynn, Doug Lothenbach, Frank Whiteman, Dean Hammermeister, Leslie W Touart, Joe Swintek, Norihisa Tatarazako, Yuta Onishi, Taisen Iguchi, Rodney Johnson
In response to various legislative mandates, the US Environmental Protection Agency (USEPA) formed its Endocrine Disruptor Screening Program (EDSP), which in turn, formed the basis of a tiered testing strategy to determine the potential of pesticides, commercial chemicals, and environmental contaminants to disrupt the endocrine system. The first tier of tests is intended to detect the potential for endocrine disruption mediated through estrogen, androgen, or thyroid pathways, whereas the second tier is intended to further characterize the effects on these pathways and to establish a dose-response relationship for adverse effects...
August 30, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28847096/evaluation-of-water-quality-during-successive-severe-drought-years-within-microcystis-blooms-using-fish-embryo-toxicity-tests-for-the-san-francisco-estuary-california
#14
Tomofumi Kurobe, Peggy W Lehman, M E Haque, Tiziana Sedda, Sarah Lesmeister, Swee Teh
In the San Francisco Estuary, California, the largest estuary on the Pacific Coast of North America, the frequency and intensity of drought and associated cyanobacteria blooms are predicted to increase with climate change. To assess the impact of water quality conditions on estuarine fish health during successive severe drought years with Microcystis blooms, we performed fish embryo toxicity testing with Delta Smelt and Medaka. Fish embryos were exposed to filtered ambient water collected from the San Francisco Estuary during the Microcystis bloom season in 2014 and 2015, the third and fourth most severe recorded drought years in California...
August 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28811909/a-fourth-subtype-of-retinoic-acid-receptor-related-orphan-receptors-is-activated-by-oxidized-all-trans-retinoic-acid-in-medaka-oryzias-latipes
#15
Kotowa Sakai, Haruka Fukushima, Yuya Yamamoto, Toshitaka Ikeuchi
BACKGROUND: The three known subtypes of the retinoic acid receptor-related orphan receptor (ROR) have been implicated in the control of immunity, brain function, and circadian rhythm in mammals. Here, we demonstrate by phylogenetic analysis that there were originally four subtypes of RORs in vertebrates. One of the novel ror paralogs, rord1 (rorca in the Ensembl database), is conserved among teleosts, but absent in mammals. Using medaka (Oryzias latipes) as a model teleost, we evaluated the expression pattern of this gene, its transactivational properties for endogenic chemicals, and its ability to activate the promoters of putative target genes...
2017: Zoological Letters
https://www.readbyqxmd.com/read/28800433/global-gene-expression-analysis-of-the-muscle-tissues-of-medaka-acclimated-to-low-and-high-environmental-temperatures
#16
Daisuke Ikeda, Hiroki Koyama, Nanami Mizusawa, Nobuhiro Kan-No, Engkong Tan, Shuichi Asakawa, Shugo Watabe
Medaka (Oryzias latipes) is a temperate eurythermal fish that is able to survive over a wide range of water temperatures ranging from near zero to over 30°C throughout the year; it maintains its normal physiological and biochemical processes through temperature acclimation. To determine the mechanisms involved in temperature acclimation of fish, the fast skeletal muscle tissues of medaka underwent global gene expression analysis using next-generation sequencing. Ten individuals were placed into two aquariums at 24°C...
August 2, 2017: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
https://www.readbyqxmd.com/read/28798535/effects-of-cadmium-exposure-on-medaka-oryzias-latipes-testes
#17
Ayano Hirako, Yuki Takeoka, Satoshi Furukawa, Akihiko Sugiyama
Adult male medaka (Oryzias latipes) were exposed to 10 ppm of cadmium for 96 h, and the testes were examined histopathologically. Numerous apoptotic cells were found in the spermatogonia and spermatocytes at 72 and 96 h after initiation of cadmium exposure, and the pyknotic index, TUNEL-positive rate, and cleaved caspase-3-positive rate in the spermatogonia and spermatocytes of the cadmium-treated group were higher compared with the control group. No significant difference between the control and cadmium-treated groups was found in the phospho-histone H3-positive rate in the spermatogonia and spermatocytes...
July 2017: Journal of Toxicologic Pathology
https://www.readbyqxmd.com/read/28792110/toxicity-of-extracts-from-municipal-wastewater-to-early-life-stages-of-japanese-medaka-oryzias-latipes-to-evaluate-removals-of-micropollutants-by-wastewater-treatment
#18
Nicholas Maya, Calvin Crispo, Victoria McFarland, Deniz Nasuhoglu, Siavash Isazadeh, Viviane Yargeau, Chris D Metcalfe
Treatment of municipal wastewater reduces the concentrations of some pharmaceuticals and personal care products, hormones and drugs of abuse. However, reduced concentrations of these micropollutants in wastewater may not correlate with reduced toxicity, as transformations of micropollutants and/or the formation of disinfection by-products may generate toxic compounds. In this study, we prepared extracts by solid phase extraction of samples collected from wastewater treatment plants (WWTPs) at various stages of treatment and tested these extracts for toxicity to early life stages of Japanese medaka (Oryzias latipes)...
August 9, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28782810/establishment-of-estrogen-receptor-1-esr1-knockout-medaka-esr1-is-dispensable-for-sexual-development-and-reproduction-in-medaka-oryzias-latipes
#19
Saki Tohyama, Yukiko Ogino, Anke Lange, Taijun Myosho, Tohru Kobayashi, Yu Hirano, Gen Yamada, Tomomi Sato, Norihisa Tatarazako, Charles R Tyler, Taisen Iguchi, Shinichi Miyagawa
Estrogens play fundamental roles in regulating reproductive activities and they act through estrogen receptor (ESR) in all vertebrates. Most vertebrates have two ESR subtypes (ESR1 and ESR2), whereas teleost fish have at least three (Esr1, Esr2a and Esr2b). Intricate functionalization has been suggested among the Esr subtypes, but to date, distinct roles of Esr have been characterized in only a limited number of species. Study of loss-of-function in animal models is a powerful tool for application to understanding vertebrate reproductive biology...
August 7, 2017: Development, Growth & Differentiation
https://www.readbyqxmd.com/read/28770388/parkinson-s-disease-pathogenesis-from-the-viewpoint-of-small-fish-models
#20
REVIEW
Hideaki Matsui, Ryosuke Takahashi
Parkinson's disease is a neurodegenerative disorder that involves movement discloses, degeneration of dopaminergic neurons, and presence of cytoplasmic inclusion bodies. Various animal models have been developed and small fish including zebrafish and medaka fish have recently been employed as a new model for Parkinson disease. In this review, we summarize fish models of Parkinson's disease mainly using our own findings and explain two major hypotheses of PD: lysosome dysfunction theory and mitochondrial dysfunction theory...
August 2, 2017: Journal of Neural Transmission
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