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Papadaki M, Mylonas CC, Sarropoulou E. MicroRNAs are involved in ovarian physiology of greater amberjack (Seriola dumerili) under captivity. Gen Comp Endocrinol 2024:114581. [PMID: 39002761 DOI: 10.1016/j.ygcen.2024.114581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 06/28/2024] [Accepted: 07/10/2024] [Indexed: 07/15/2024]
Abstract
Gonad maturation is critical for the reproductive success of any organism, and in fish, captivity can significantly affect their reproductive performance, leading to maturation incompetence and spawning failure. The greater amberjack (Seriola dumerili), a fish species recently introduced to aquaculture fails to undergo oocyte maturation, ovulation, and spawning when reared in aquaculture facilities. Since confinement has been shown to influence gonad maturation and completion of the reproductive cycle, investigations into epigenetic mechanisms may shed light on the reasoning behind the reproductive dysfunctions of fish under captivity. Among the known important epigenetic regulators are small non-coding RNAs (sncRNAs), and in particular microRNAs (miRNAs). In this study, immature, maturing (late vitellogenesis), and spent ovaries of captive greater amberjack were collected, and the differential expression of miRNAs in the three different ovarian development stages was examined. Expression patterns of conserved and novel miRNAs were identified, and potential targets of highly differentially expressed miRNAs were detected. Additionally, read length distribution showed two prominent peaks in the three different ovarian maturation stages, corresponding to miRNAs and putative piwi-interacting RNAs (piRNAs), another type of ncRNAs with a germ-cell specific role. Furthermore, miRNA expression patterns and their putative target mRNAs are discussed, in relevance with the different ovarian maturation stages of captive greater amberjack. Overall, this study provides insights into the role of miRNAs in the reproductive dysfunctions observed in fish under captivity and highlights the importance of epigenetic mechanisms in understanding and managing the reproductive performance of economically important fish species.
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Affiliation(s)
- Maria Papadaki
- Hellenic Center for Marine Research, P.O. Box 2214, Heraklion, Crete 71003, Greece; Biology Department, University of Crete, P.O. Box 2208, Heraklion, Crete 70013, Greece
| | - C C Mylonas
- Hellenic Center for Marine Research, P.O. Box 2214, Heraklion, Crete 71003, Greece
| | - Elena Sarropoulou
- Hellenic Center for Marine Research, P.O. Box 2214, Heraklion, Crete 71003, Greece.
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Nzioka A, Valencia A, Atxaerandio-Landa A, Diaz de Cerio O, Hossain MA, Korta M, Ortiz-Zarragoitia M, Cancio I. Apoptosis and autophagy-related gene transcription during ovarian follicular atresia in European hake (Merluccius merluccius). MARINE ENVIRONMENTAL RESEARCH 2023; 183:105846. [PMID: 36521304 DOI: 10.1016/j.marenvres.2022.105846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 11/30/2022] [Accepted: 12/07/2022] [Indexed: 06/17/2023]
Abstract
Follicular atresia is an energy-saving oocyte resorption process that can allow the survival of female fish when environmental conditions are unfavourable and at the expense of fecundity. This study investigated the transcription levels of apoptosis and autophagy-related genes during atresia in the European hake that can show episodes of increased follicular atresia throughout the reproductive cycle. 169 female individuals were collected from the Bay of Biscay, and the ovaries were analysed using histological and molecular methods. Different levels of atresia were histologically detected in 73.7% of the ovaries analysed and the TUNEL assay identified apoptotic nuclei in follicles from both previtellogenic and vitellogenic stages. Transcripts of beclin-1 and ptenb were up-regulated in the ovaries containing atretic follicles, whereas p53, caspase-3, cathepsin D and dapk1 were up-regulated only in ovaries presenting vitellogenic atretic follicles. Our results indicate different implications of apoptotic vs autophagic processes leading to atresia during oocyte development, vitellogenesis being the moment of maximal apoptotic and autophagic activity in atretic hakes. The analysed genes could provide early warning biomarkers to identify follicular atresia in fish and evaluate fecundity in fish stocks.
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Affiliation(s)
- Anthony Nzioka
- CBET Research Group, Dept. Zoology & Animal Cell Biology, Faculty of Science & Technology and Research Centre for Experimental Marine Biology and Biotechnology (PiE-UPV/EHU), University of the Basque Country, Areatza Hiribidea s/n, 48620, Plentzia, Basque Country, Spain
| | - Ainara Valencia
- CBET Research Group, Dept. Zoology & Animal Cell Biology, Faculty of Science & Technology and Research Centre for Experimental Marine Biology and Biotechnology (PiE-UPV/EHU), University of the Basque Country, Areatza Hiribidea s/n, 48620, Plentzia, Basque Country, Spain
| | - Aitor Atxaerandio-Landa
- CBET Research Group, Dept. Zoology & Animal Cell Biology, Faculty of Science & Technology and Research Centre for Experimental Marine Biology and Biotechnology (PiE-UPV/EHU), University of the Basque Country, Areatza Hiribidea s/n, 48620, Plentzia, Basque Country, Spain
| | - Oihane Diaz de Cerio
- CBET Research Group, Dept. Zoology & Animal Cell Biology, Faculty of Science & Technology and Research Centre for Experimental Marine Biology and Biotechnology (PiE-UPV/EHU), University of the Basque Country, Areatza Hiribidea s/n, 48620, Plentzia, Basque Country, Spain
| | - Mohammad Amzad Hossain
- CBET Research Group, Dept. Zoology & Animal Cell Biology, Faculty of Science & Technology and Research Centre for Experimental Marine Biology and Biotechnology (PiE-UPV/EHU), University of the Basque Country, Areatza Hiribidea s/n, 48620, Plentzia, Basque Country, Spain
| | - Maria Korta
- AZTI-Tecnalia, Herrera Kaia, Portualdea z/g, 20110, Pasaia, Basque Country, Spain
| | - Maren Ortiz-Zarragoitia
- CBET Research Group, Dept. Zoology & Animal Cell Biology, Faculty of Science & Technology and Research Centre for Experimental Marine Biology and Biotechnology (PiE-UPV/EHU), University of the Basque Country, Areatza Hiribidea s/n, 48620, Plentzia, Basque Country, Spain
| | - Ibon Cancio
- CBET Research Group, Dept. Zoology & Animal Cell Biology, Faculty of Science & Technology and Research Centre for Experimental Marine Biology and Biotechnology (PiE-UPV/EHU), University of the Basque Country, Areatza Hiribidea s/n, 48620, Plentzia, Basque Country, Spain.
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3
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A review of the potential genes implicated in follicular atresia in teleost fish. Mar Genomics 2020; 50:100704. [DOI: 10.1016/j.margen.2019.100704] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 07/31/2019] [Accepted: 09/03/2019] [Indexed: 11/21/2022]
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Breton TS, Kenter LW, Greenlaw K, Montgomery J, Goetz GW, Berlinsky DL, Luckenbach JA. Initiation of sex change and gonadal gene expression in black sea bass (Centropristis striata) exposed to exemestane, an aromatase inhibitor. Comp Biochem Physiol A Mol Integr Physiol 2018; 228:51-61. [PMID: 30414915 DOI: 10.1016/j.cbpa.2018.10.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 10/24/2018] [Accepted: 10/30/2018] [Indexed: 12/25/2022]
Abstract
Many teleost fishes exhibit sequential hermaphroditism, where male or female gonads develop first and later undergo sex change. Model sex change species are characterized by social hierarchies and coloration changes, which enable experimental manipulations to better understand these processes. However, other species such as the protogynous black sea bass (Centropristis striata) do not exhibit these characteristics and instead receive research attention due to their importance in fisheries or aquaculture. Black sea bass social structure is unknown, which makes sex change sampling difficult, and few molecular resources are available. The purpose of the present study was to induce sex change using exemestane, an aromatase inhibitor, and assess gonadal gene expression using sex markers (amh, zpc2) and genes involved in steroidogenesis (cyp19a1a, cyp11b), estrogen signaling (esr1, esr2b), and apoptosis or atresia (aen, casp9, fabp11, parg, pdcd4, rif1). Overall, dietary exemestane treatment was effective, and most exposed females exhibited early histological signs of sex change and significantly higher rates of ovarian atresia relative to control females. Genes associated with atresia did not reflect this, however, as expression patterns in sex changing gonads were overall similar to those of ovaries, likely due to a whole ovary dilution effect of the RNA. Still, small but insignificant expression decreases during early sex change were detected for ovary-related genes (aen, casp9, fabp11, zpc2) and anti-apoptotic factors (parg, rif1). Exemestane treatment did not impact spermatogenesis or testicular gene expression, but testes were generally characterized by elevated steroidogenic enzyme and estrogen receptor mRNAs. Further research will be needed to understand these processes in black sea bass, using isolated ovarian follicles and multiple stages of sex change.
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Affiliation(s)
- Timothy S Breton
- Division of Natural Sciences, University of Maine at Farmington, 173 High Street, Farmington, ME 04938, USA.
| | - Linas W Kenter
- Department of Biological Sciences, University of New Hampshire, 38 College Road, Durham, NH 03824, USA
| | - Katherine Greenlaw
- Division of Natural Sciences, University of Maine at Farmington, 173 High Street, Farmington, ME 04938, USA
| | - Jacob Montgomery
- Division of Natural Sciences, University of Maine at Farmington, 173 High Street, Farmington, ME 04938, USA
| | - Giles W Goetz
- School of Aquatic and Fishery Sciences, University of Washington, Seattle, WA 98195, USA
| | - David L Berlinsky
- Department of Agriculture, Nutrition, and Food Systems, University of New Hampshire, 46 College Road, Durham, NH 03824, USA
| | - J Adam Luckenbach
- Environmental and Fisheries Sciences Division, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA 98112, USA; Center for Reproductive Biology, Washington State University, Pullman, WA 99164, USA
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Hatching enzymes disrupt aberrant gonadal degeneration by the autophagy/apoptosis cell fate decision. Sci Rep 2017; 7:3183. [PMID: 28600501 PMCID: PMC5466654 DOI: 10.1038/s41598-017-03314-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 04/25/2017] [Indexed: 11/19/2022] Open
Abstract
Environmental stressors, gonadal degenerative diseases and tumour development can significantly alter the oocyte physiology, and species fertility and fitness. To expand the molecular understanding about oocyte degradation, we isolated several spliced variants of Japanese anchovy hatching enzymes (AcHEs; ovastacin homologue) 1 and 2, and analysed their potential in oocyte sustenance. Particularly, AcHE1b, an ovary-specific, steroid-regulated, methylation-dependent, stress-responsive isoform, was neofunctionalized to regulate autophagic oocyte degeneration. AcHE1a and 2 triggered apoptotic degeneration in vitellogenic and mature oocytes, respectively. Progesterone, starvation, and high temperature elevated the total degenerating oocyte population and AcHE1b transcription by hyper-demethylation. Overexpression, knockdown and intracellular zinc ion chelation study confirmed the functional significance of AcHE1b in autophagy induction, possibly to mitigate the stress effects in fish, via ion-homeostasis. Our finding chronicles the importance of AcHEs in stress-influenced apoptosis/autophagy cell fate decision and may prove significant in reproductive failure assessments, gonadal health maintenance and ovarian degenerative disease therapy.
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Zhang WW, Jia YF, Wang F, Du QY, Chang ZJ. Identification of differentially-expressed genes in early developmental ovary of Yellow River carp (Cyprinus carpio var) using Suppression Subtractive Hybridization. Theriogenology 2017; 97:9-16. [PMID: 28583615 DOI: 10.1016/j.theriogenology.2017.04.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 03/23/2017] [Accepted: 04/10/2017] [Indexed: 10/19/2022]
Abstract
Ovary development appears to be under polygenic control, and is influenced by multiple genetic factors that may vary from organism to organism. To gain a better insight into the molecular mechanisms of carp ovary development, Suppression Subtractive Hybridization (SSH) DNA libraries in two species of Yellow River carp were analyzed. Primordial gonads and stage II ovaries were used as testers, and adult ovaries as drivers. One hundred and fifty differentially-expressed candidate genes were examined by Southern blot microarray hybridization. We identified 41 differentially-expressed genes in the PG (Primordial gonad) library and 37 in the stage II ovary library. Gene Ontology Biological Pathway analysis showed the genes were involved in signal transduction, proteolysis process, cell differentiation, TGF-β signal and other biological responses. Twenty-two candidate genes were selected and further characterized using qRT-PCR. Pvalb, epd, and MYH were found specifically expressed in PG, while bmp2b, desmin and fp1 were specifically expressed in stage II ovary. Our results indicate that these genes could be used as biomarkers of the early development of carp ovary. This finding will provide a basis for further understanding of the complex gonad developmental molecular mechanisms in Yellow River carp.
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Affiliation(s)
- Wan-Wan Zhang
- College of Life Science, Henan Normal University, Xinxiang, Henan, 453007, People's Republic of China
| | - Yong-Fang Jia
- College of Life Science, Henan Normal University, Xinxiang, Henan, 453007, People's Republic of China
| | - Fang Wang
- College of Life Science, Henan Normal University, Xinxiang, Henan, 453007, People's Republic of China
| | - Qi-Yan Du
- College of Life Science, Henan Normal University, Xinxiang, Henan, 453007, People's Republic of China
| | - Zhong-Jie Chang
- College of Life Science, Henan Normal University, Xinxiang, Henan, 453007, People's Republic of China.
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