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  1. Article ; Online: DNA methylation reprogramming in medaka fish, a promising animal model for environmental epigenetics research.

    Wang, Xuegeng / Bhandari, Ramji K

    Environmental epigenetics

    2020  Volume 6, Issue 1, Page(s) dvaa008

    Abstract: DNA methylation is a major epigenetic modification that undergoes dramatic changes in two epigenetic reprogramming windows during development: first in preimplantation embryos and second in primordial germ cell (PGC) specification. In both windows, DNA ... ...

    Abstract DNA methylation is a major epigenetic modification that undergoes dramatic changes in two epigenetic reprogramming windows during development: first in preimplantation embryos and second in primordial germ cell (PGC) specification. In both windows, DNA methylation patterns are reprogrammed genome-wide, and the majority of inherited methylation marks are erased, generating cells with broad developmental potential. Recent studies reported that the reprogramming of genome methylation in medaka is similar to human and mouse, suggesting that medaka may serve as a suitable biomedical model for comparative studies focused on the epigenetic and transgenerational inheritance of phenotypic traits. In this mini review, we will discuss how somatic and germ cells in post-fertilization stage embryos are epigenetically reprogrammed in mammals and fishes with a particular focus on DNA methylation dynamics.
    Language English
    Publishing date 2020-07-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 2831217-X
    ISSN 2058-5888 ; 2058-5888
    ISSN (online) 2058-5888
    ISSN 2058-5888
    DOI 10.1093/eep/dvaa008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Medaka as a model for studying environmentally induced epigenetic transgenerational inheritance of phenotypes.

    Bhandari, Ramji K

    Environmental epigenetics

    2016  Volume 2, Issue 1, Page(s) dvv010

    Abstract: Ability of environmental stressors to induce transgenerational diseases has been experimentally demonstrated in plants, worms, fish, and mammals, indicating that exposures affect not only human health but also fish and ecosystem health. Small aquarium ... ...

    Abstract Ability of environmental stressors to induce transgenerational diseases has been experimentally demonstrated in plants, worms, fish, and mammals, indicating that exposures affect not only human health but also fish and ecosystem health. Small aquarium fish have been reliable model to study genetic and epigenetic basis of development and disease. Additionally, fish can also provide better, economic opportunity to study transgenerational inheritance of adverse health and epigenetic mechanisms. Molecular mechanisms underlying germ cell development in fish are comparable to those in mammals and humans. This review will provide a short overview of long-term effects of environmental chemical contaminant exposure in various models, associated epigenetic mechanisms, and a perspective on fish as model to study environmentally induced transgenerational inheritance of altered phenotypes.
    Language English
    Publishing date 2016-01-30
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2831217-X
    ISSN 2058-5888
    ISSN 2058-5888
    DOI 10.1093/eep/dvv010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Potassium perchlorate effects on primordial germ cells of developing medaka larvae.

    Reh, Beh / Wang, Xuegeng / Feng, Yashi / Bhandari, Ramji K

    Aquatic toxicology (Amsterdam, Netherlands)

    2022  Volume 251, Page(s) 106283

    Abstract: Perchlorate is a chemical compound commonly used in military artillery and equipment. It has been detected in drinking water, air, soil, and breast milk. Exposure of humans to perchlorate can occur in the theater of war and areas adjacent to military ... ...

    Abstract Perchlorate is a chemical compound commonly used in military artillery and equipment. It has been detected in drinking water, air, soil, and breast milk. Exposure of humans to perchlorate can occur in the theater of war and areas adjacent to military training grounds. A high concentration of perchlorate has been found to affect reproduction in vertebrates, including fish. However, whether environmental concentrations of perchlorate can affect primordial germ cells (PGCs), the founders of sperm and eggs, is not clearly understood. In the present study, we examined the effects of 0, 10, 100, and 1000 μg/L potassium perchlorate exposure on the embryonic development of medaka and their PGCs. Perchlorate exposure delayed hatching time, reduced heartbeat, inhibited migration of PGCs, and increased developmental deformities in the larvae. The 10 and 20 mg/L concentrations of perchlorate were lethal to embryos, whereas vitamin C co-treatment (1 mg/L) completely blocked perchlorate-induced mortality. RNA-seq analysis of isolated PGCs showed a non-linear pattern in expression profiles of differentially altered genes. Significantly upregulated genes were found in PGCs from the 10 and 1000 μg/L groups, whereas the 100 μg/L groups showed the highest number of significantly downregulated genes. Gene ontology analysis predicted differentially expressed genes to be involved in proteolysis, metabolic processes, peptides activity, hydrolase activity, and hormone activity. Among the cellular components, extracellular, intracellular, sarcoplasmic, and 6-phosphofructokinase and membrane-bounded processes were affected. Ingenuity Pathway Analysis of PGC transcriptomes revealed thyroid hormone signaling to be affected by all concentrations of perchlorate. The present results suggested that perchlorate affected the development of medaka larvae and vitamin C was able to ameliorate perchlorate-induced embryo mortality. Additionally, perchlorate altered the global transcriptional network in PGCs in a non-linear fashion suggesting its potential effects on developing germ cells and fertility.
    MeSH term(s) Animals ; Ascorbic Acid/metabolism ; Drinking Water/metabolism ; Female ; Germ Cells/metabolism ; Hormones/metabolism ; Humans ; Hydrolases/metabolism ; Larva ; Male ; Oryzias/genetics ; Perchlorates/metabolism ; Perchlorates/toxicity ; Potassium Compounds ; Semen ; Soil ; Water Pollutants, Chemical/toxicity
    Chemical Substances Drinking Water ; Hormones ; Perchlorates ; Potassium Compounds ; Soil ; Water Pollutants, Chemical ; potassium perchlorate (42255P5X4D) ; Hydrolases (EC 3.-) ; Ascorbic Acid (PQ6CK8PD0R) ; perchlorate (VLA4NZX2P4)
    Language English
    Publishing date 2022-08-27
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 782699-0
    ISSN 1879-1514 ; 0166-445X
    ISSN (online) 1879-1514
    ISSN 0166-445X
    DOI 10.1016/j.aquatox.2022.106283
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Author Correction: Nano-fibre Integrated Microcapsules: A Nano-in-Micro Platform for 3D Cell Culture.

    Khanal, Shalil / Bhattarai, Shanta R / Sankar, Jagannathan / Bhandari, Ramji K / Macdonald, Jeffrey M / Bhattarai, Narayan

    Scientific reports

    2023  Volume 13, Issue 1, Page(s) 1269

    Language English
    Publishing date 2023-01-23
    Publishing country England
    Document type Published Erratum
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-023-28208-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Potassium Perchlorate Effects on Primordial Germ Cells of Developing Medaka Larvae

    Reh, Beh / Wang, Xuegeng / Feng, Yashi / Bhandari, Ramji K.

    Aquatic toxicology. 2022 Aug. 25,

    2022  

    Abstract: Perchlorate is a chemical compound commonly used in military artillery and equipment. It has been detected in drinking water, air, soil, and breast milk. Human exposure can occur in the theatre of war and areas adjacent to military training grounds. A ... ...

    Abstract Perchlorate is a chemical compound commonly used in military artillery and equipment. It has been detected in drinking water, air, soil, and breast milk. Human exposure can occur in the theatre of war and areas adjacent to military training grounds. A high concentration of perchlorate has been found to affect reproduction in vertebrates, including fish. However, whether environmental concentrations of perchlorate can affect primordial germ cells (PGCs), the founders of sperm and eggs, is not clearly understood. In the present study, we examined the effects of 0, 10, 100, and 1000 μg/L potassium perchlorate exposure on the embryonic development of medaka and larvae and their PGCs. Perchlorate exposure delayed hatching time, reduced heartbeat, inhibited migration of PGCs, and increased developmental deformities in the larvae. The 10 and 20 mg/L concentrations of perchlorate were lethal to embryos, whereas vitamin C co-treatment (1 mg/L) completely blocked perchlorate-induced mortality. RNA-seq analysis of isolated PGCs showed a non-linear pattern in expression profiles of differentially altered genes. Significantly upregulated genes were found in PGCs from the 10 and 1000 μg/L groups, whereas the 100 μg/L groups showed the highest number of significantly downregulated genes. Gene ontology analysis predicted differentially expressed genes to be involved in proteolysis, metabolic processes, peptides activity, hydrolase activity, and hormone activity. Among the cellular components, extracellular, intracellular, sarcoplasmic, and 6-phosphofructokinase and membrane-bounded processes were affected. Ingenuity Pathway Analysis of PGC transcriptomes revealed thyroid hormone signaling to be affected by all concentrations of perchlorate. The present results suggested that perchlorate affected the development of medaka larvae and vitamin C was able to ameliorate perchlorate-induced embryo mortality. Additionally, perchlorate altered the global transcriptional network in PGCs in a non-linear fashion suggesting its potential effects on developing germ cells and fertility.
    Keywords 6-phosphofructokinase ; air ; ascorbic acid ; breast milk ; embryogenesis ; embryonic mortality ; equipment ; fish ; gene expression regulation ; gene ontology ; heart rate ; humans ; hydrolases ; mortality ; peptides ; perchlorates ; potassium ; proteolysis ; sequence analysis ; soil ; spermatozoa ; thyroid hormones ; toxicology ; transcription (genetics) ; transcriptome
    Language English
    Dates of publication 2022-0825
    Publishing place Elsevier B.V.
    Document type Article
    Note Pre-press version
    ZDB-ID 782699-0
    ISSN 1879-1514 ; 0166-445X
    ISSN (online) 1879-1514
    ISSN 0166-445X
    DOI 10.1016/j.aquatox.2022.106283
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Ancestral BPA exposure caused defects in the liver of medaka for four generations

    Chakraborty, Sourav / Dissanayake, Manthi / Godwin, Julia / Wang, Xuegeng / Bhandari, Ramji K.

    Science of the total environment. 2022 Sept. 23,

    2022  

    Abstract: In addition to lifestyle-induced liver defects, environmental chemicals can induce liver defects in experimental animals due to their direct and acute exposure. It is not clear whether environmental chemical exposures result in the transgenerational ... ...

    Abstract In addition to lifestyle-induced liver defects, environmental chemicals can induce liver defects in experimental animals due to their direct and acute exposure. It is not clear whether environmental chemical exposures result in the transgenerational passage of liver defects in subsequent generations living in an uncontaminated environment. Bisphenol A (BPA), a plasticizer chemical, has been ubiquitous in the environment in the recent decade. Every organism is exposed to this chemical at some point during its lifetime. Literature suggests that direct BPA exposure can result in several metabolic diseases, including non-alcoholic fatty liver disease (NAFLD). Despite the phasing out of BPA from several consumer goods, it is unclear whether ancestral BPA exposure causes liver health problems in the unexposed future generations. Here, we demonstrate an advanced stage of NAFLD in the grandchildren (F2 generation) of medaka fish (Oryzias latipes) due to embryonic BPA exposure in the grandparental generation (F0), which persists for five generations (F4) even in the absence of BPA. The severity of transgenerational NAFLD phenotype included steatosis together with perisinusoidal fibrosis and apoptosis of hepatocytes. Adult females developed more severe histopathological conditions in the liver than males. Genes encoding enzymes involved in lipolytic pathways were significantly decreased. The present results suggest that ancestral BPA exposure can result in transgenerational metabolic diseases that can persist for five generations and that the NAFLD trait is sexually dimorphic. Given that ancestral BPA exposure can lead to altered metabolic health outcomes in the subsequent unexposed generations, the development of the methods and strategies to mitigate the transgenerational onset of metabolic diseases seem imperative to protect future generations.
    Keywords Oryzias latipes ; acute exposure ; adults ; apoptosis ; bisphenol A ; environment ; fatty liver ; fibrosis ; hepatocytes ; histopathology ; liver ; phenotype ; plasticizers ; sexual dimorphism
    Language English
    Dates of publication 2022-0923
    Publishing place Elsevier B.V.
    Document type Article
    Note Pre-press version
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2022.159067
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  7. Article ; Online: Developmental abnormalities and epigenetic alterations in medaka (Oryzias latipes) embryos induced by triclosan exposure.

    Song, Xiaohong / Wang, Xuegeng / Bhandari, Ramji K

    Chemosphere

    2020  Volume 261, Page(s) 127613

    Abstract: Triclosan (TCS), an antibacterial and antifungal agent present in some consumer products, has been detected in the environment at varying concentrations. TCS exposure has been found to cause developmental abnormalities and endocrine disruption in various ...

    Abstract Triclosan (TCS), an antibacterial and antifungal agent present in some consumer products, has been detected in the environment at varying concentrations. TCS exposure has been found to cause developmental abnormalities and endocrine disruption in various species of fish. It is not clearly understood whether TCS exposure causes epigenetic alterations in developing embryos and their germ cells. In the present study, we examined the effects of TCS exposure (0, 50, 100 and, 200 μg/L) on embryonic development and primordial germ cells (PGCs), which are precursors of sperm and eggs, in medaka (Oyzias latipes). Developmental TCS exposure from 8 h post-fertilization through 15 days post-fertilization (dpf) resulted in several developmental abnormalities, including enlarged yolk sac, decreased head trunk angle (HTA), and severe edema in the pericardial region. The male ratio increased in the 100 μg/L TCS exposure group, which was negatively correlated with the expression of cyp19ala (a gene encoding aromatase) and arα (androgen receptor alpha). Developmental 50 μg/L TCS exposure resulted in global hypomethylation in the whole body but not in the isolated PGCs. Expression of the gene encoding DNA methyltransferases (dnmt1 and dnmt3aa) was decreased by 50 μg/L TCS exposure both in the whole body and PGCs. TCS altered the expression of genes encoding enzymes involved in DNA methylation and demethylation in PGCs, suggesting epigenetic effects on germ cells. The present results demonstrate that the embryos exposed to the tested concentrations of TCS develop deformities during the early life stages and that the TCS within this range possesses endocrine disrupting properties potential enough to alter sex ratios of developing embryos.
    MeSH term(s) Animals ; DNA Methylation/drug effects ; Embryo, Nonmammalian/drug effects ; Endocrine Disruptors/pharmacology ; Epigenesis, Genetic/drug effects ; Epigenomics ; Germ Cells/drug effects ; Male ; Oryzias/embryology ; Triclosan/pharmacology ; Triclosan/toxicity ; Water Pollutants, Chemical/toxicity
    Chemical Substances Endocrine Disruptors ; Water Pollutants, Chemical ; Triclosan (4NM5039Y5X)
    Language English
    Publishing date 2020-07-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2020.127613
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Distinct expression patterns of seven crucial microRNAs during early embryonic development in medaka (Oryzias latipes).

    Wang, Xuegeng / Song, Xiaohong / Bhandari, Ramji K

    Gene expression patterns : GEP

    2020  Volume 37, Page(s) 119133

    Abstract: MicroRNAs (i.e. miRNAs) are small non-coding RNAs that play essential modulation roles in embryonic development in vertebrates. Paternal and maternal miRNAs contribute to the development of post-fertilization embryo and zygotic genome activation. The ... ...

    Abstract MicroRNAs (i.e. miRNAs) are small non-coding RNAs that play essential modulation roles in embryonic development in vertebrates. Paternal and maternal miRNAs contribute to the development of post-fertilization embryo and zygotic genome activation. The pattern of expression and their roles in embryonic development of medaka are not clearly understood. The present study, therefore, examined a temporal expression of seven miRNAs, ola-let-7a, ola-miR-202-3p, ola-miR-126-3p, ola-miR-122, ola-miR-92a, ola-miR-125a-3p and ola-miR-430a in sperm, oocytes, and embryos during early developmental stages. Three unique expression patterns of miRNAs were observed. ola-let7a, ola-miR-202-3p and ola-miR-126-3p showed both paternal and maternal expression, and ola-miR-122, ola-miR-92a, ola-miR-125a-3p showed maternal expression only. The expression of six out of seven miRNAs significantly decreased after maternal-zygotic transition (MZT), whereas ola-miR-430a expression initiated only after MZT. The temporal dynamic expression of these miRNAs suggests their potential roles in early embryogenesis and genome-zygotic activation in medaka.
    MeSH term(s) Animals ; Embryonic Development/genetics ; Female ; Gene Expression Regulation, Developmental ; Male ; MicroRNAs/genetics ; Oocytes/metabolism ; Oryzias/embryology ; Oryzias/genetics ; Spermatozoa/metabolism
    Chemical Substances MicroRNAs
    Language English
    Publishing date 2020-08-13
    Publishing country Netherlands
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2058346-1
    ISSN 1872-7298 ; 1567-133X
    ISSN (online) 1872-7298
    ISSN 1567-133X
    DOI 10.1016/j.gep.2020.119133
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Developmental abnormalities and epigenetic alterations in medaka (Oryzias latipes) embryos induced by triclosan exposure

    Song, Xiaohong / Wang, Xuegeng / Bhandari, Ramji K

    Chemosphere. 2020 Dec., v. 261

    2020  

    Abstract: Triclosan (TCS), an antibacterial and antifungal agent present in some consumer products, has been detected in the environment at varying concentrations. TCS exposure has been found to cause developmental abnormalities and endocrine disruption in various ...

    Abstract Triclosan (TCS), an antibacterial and antifungal agent present in some consumer products, has been detected in the environment at varying concentrations. TCS exposure has been found to cause developmental abnormalities and endocrine disruption in various species of fish. It is not clearly understood whether TCS exposure causes epigenetic alterations in developing embryos and their germ cells. In the present study, we examined the effects of TCS exposure (0, 50, 100 and, 200 μg/L) on embryonic development and primordial germ cells (PGCs), which are precursors of sperm and eggs, in medaka (Oyzias latipes). Developmental TCS exposure from 8 h post-fertilization through 15 days post-fertilization (dpf) resulted in several developmental abnormalities, including enlarged yolk sac, decreased head trunk angle (HTA), and severe edema in the pericardial region. The male ratio increased in the 100 μg/L TCS exposure group, which was negatively correlated with the expression of cyp19ala (a gene encoding aromatase) and arα (androgen receptor alpha). Developmental 50 μg/L TCS exposure resulted in global hypomethylation in the whole body but not in the isolated PGCs. Expression of the gene encoding DNA methyltransferases (dnmt1 and dnmt3aa) was decreased by 50 μg/L TCS exposure both in the whole body and PGCs. TCS altered the expression of genes encoding enzymes involved in DNA methylation and demethylation in PGCs, suggesting epigenetic effects on germ cells. The present results demonstrate that the embryos exposed to the tested concentrations of TCS develop deformities during the early life stages and that the TCS within this range possesses endocrine disrupting properties potential enough to alter sex ratios of developing embryos.
    Keywords DNA ; DNA methylation ; Leptothrium ; Oryzias latipes ; abnormal development ; androgen receptors ; aromatase ; correlation ; demethylation ; developmental stages ; edema ; eggs ; embryogenesis ; environment ; epigenetics ; fish ; gene expression ; genes ; head ; males ; methyltransferases ; pericardium ; products and commodities ; sex ratio ; spermatozoa ; triclosan ; yolk sac
    Language English
    Dates of publication 2020-12
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-light
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2020.127613
    Database NAL-Catalogue (AGRICOLA)

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  10. Article: Distinct expression patterns of seven crucial microRNAs during early embryonic development in medaka (Oryzias latipes)

    Wang, Xuegeng / Song, Xiaohong / Bhandari, Ramji K

    Gene expression patterns. 2020 Sept., v. 37

    2020  

    Abstract: MicroRNAs (i.e. miRNAs) are small non-coding RNAs that play essential modulation roles in embryonic development in vertebrates. Paternal and maternal miRNAs contribute to the development of post-fertilization embryo and zygotic genome activation. The ... ...

    Abstract MicroRNAs (i.e. miRNAs) are small non-coding RNAs that play essential modulation roles in embryonic development in vertebrates. Paternal and maternal miRNAs contribute to the development of post-fertilization embryo and zygotic genome activation. The pattern of expression and their roles in embryonic development of medaka are not clearly understood. The present study, therefore, examined a temporal expression of seven miRNAs, ola-let-7a, ola-miR-202-3p, ola-miR-126-3p, ola-miR-122, ola-miR-92a, ola-miR-125a-3p and ola-miR-430a in sperm, oocytes, and embryos during early developmental stages. Three unique expression patterns of miRNAs were observed. ola-let7a, ola-miR-202-3p and ola-miR-126-3p showed both paternal and maternal expression, and ola-miR-122, ola-miR-92a, ola-miR-125a-3p showed maternal expression only. The expression of six out of seven miRNAs significantly decreased after maternal-zygotic transition (MZT), whereas ola-miR-430a expression initiated only after MZT. The temporal dynamic expression of these miRNAs suggests their potential roles in early embryogenesis and genome-zygotic activation in medaka.
    Keywords Oryzias latipes ; developmental stages ; embryogenesis ; genome ; microRNA ; non-coding RNA ; oocytes ; spermatozoa ; vertebrates
    Language English
    Dates of publication 2020-09
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 2058346-1
    ISSN 1872-7298 ; 1567-133X
    ISSN (online) 1872-7298
    ISSN 1567-133X
    DOI 10.1016/j.gep.2020.119133
    Database NAL-Catalogue (AGRICOLA)

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