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Castille J, Thépot D, Fouchécourt S, Dalbies-Tran R, Passet B, Daniel-Carlier N, Vilotte JL, Monget P. The paralogs' enigma of germ-cell specific genes dispensable for fertility: the case of 19 oogenesin genes†. Biol Reprod 2023; 109:408-414. [PMID: 37561421 DOI: 10.1093/biolre/ioad092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 07/28/2023] [Accepted: 08/02/2023] [Indexed: 08/11/2023] Open
Abstract
Gene knockout experiments have shown that many genes are dispensable for a given biological function. In this review, we make an assessment of male and female germ cell-specific genes dispensable for the function of reproduction in mice, the inactivation of which does not affect fertility. In particular, we describe the deletion of a 1 Mb block containing nineteen paralogous genes of the oogenesin/Pramel family specifically expressed in female and/or male germ cells, which has no consequences in both sexes. We discuss this notion of dispensability and the experiments that need to be carried out to definitively conclude that a gene is dispensable for a function.
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Affiliation(s)
- Johan Castille
- Université Paris-Saclay, INRAE, AgroParisTech, GABI, Jouy-en-Josas, France
| | | | | | | | - Bruno Passet
- Université Paris-Saclay, INRAE, AgroParisTech, GABI, Jouy-en-Josas, France
| | | | - Jean-Luc Vilotte
- Université Paris-Saclay, INRAE, AgroParisTech, GABI, Jouy-en-Josas, France
| | - Philippe Monget
- PRC INRAE, CNRS, IFCE, Université de Tours, Nouzilly, France
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2
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Uzbekova S, Bertevello PS, Dalbies-Tran R, Elis S, Labas V, Monget P, Teixeira-Gomes AP. Metabolic exchanges between the oocyte and its environment: focus on lipids. Reprod Fertil Dev 2021; 34:1-26. [PMID: 35231385 DOI: 10.1071/rd21249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Finely regulated fatty acid (FA) metabolism within ovarian follicles is crucial to follicular development and influences the quality of the enclosed oocyte, which relies on the surrounding intra-follicular environment for its growth and maturation. A growing number of studies have examined the association between the lipid composition of follicular compartments and oocyte quality. In this review, we focus on lipids, their possible exchanges between compartments within the ovarian follicle and their involvement in different pathways during oocyte final growth and maturation. Lipidomics provides a detailed snapshot of the global lipid profiles and identified lipids, clearly discriminating the cells or fluid from follicles at distinct physiological stages. Follicular fluid appears as a main mediator of lipid exchanges between follicular somatic cells and the oocyte, through vesicle-mediated and non-vesicular transport of esterified and free FA. A variety of expression data allowed the identification of common and cell-type-specific actors of lipid metabolism in theca cells, granulosa cells, cumulus cells and oocytes, including key regulators of FA uptake, FA transport, lipid transformation, lipoprotein synthesis and protein palmitoylation. They act in harmony to accompany follicular development, and maintain intra-follicular homeostasis to allow the oocyte to accumulate energy and membrane lipids for subsequent meiotic divisions and first embryo cleavages.
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Affiliation(s)
- Svetlana Uzbekova
- CNRS, IFCE, INRAE, Université de Tours, PRC, F-37380 Nouzilly, France; and LK Ernst Federal Science Centre for Animal Husbandry, Podolsk, Russia
| | | | | | - Sebastien Elis
- CNRS, IFCE, INRAE, Université de Tours, PRC, F-37380 Nouzilly, France
| | - Valerie Labas
- CNRS, IFCE, INRAE, Université de Tours, PRC, F-37380 Nouzilly, France; and INRAE, Université de Tours, CHRU Tours, Plate-Forme PIXANIM, F-37380 Nouzilly, France
| | - Philippe Monget
- CNRS, IFCE, INRAE, Université de Tours, PRC, F-37380 Nouzilly, France
| | - Ana-Paula Teixeira-Gomes
- CNRS, IFCE, INRAE, Université de Tours, PRC, F-37380 Nouzilly, France; and INRAE, Université de Tours, CHRU Tours, Plate-Forme PIXANIM, F-37380 Nouzilly, France
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3
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Cadoret V, Jarrier-Gaillard P, Papillier P, Monniaux D, Guérif F, Dalbies-Tran R. Leukaemia inhibitory factor modulates the differentiation of granulosa cells during sheep in vitro preantral to antral follicle development and improves oocyte meiotic competence. Mol Hum Reprod 2021; 27:6355046. [PMID: 34411256 DOI: 10.1093/molehr/gaab051] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 06/11/2021] [Indexed: 11/13/2022] Open
Abstract
In vitro follicle development from cryopreserved ovarian tissue could become an invaluable assisted reproduction technology for women with early ovarian failure. The challenge lies in producing, from small follicles present in the ovarian cortex, high-quality mature oocytes able to sustain embryo development. In vivo, an optimal combination of hormones and other factors coordinates the development of follicles and their enclosed oocyte. We have investigated the effect of the leukaemia inhibitory factor (LIF) cytokine, alone or in combination with FSH, on sheep in vitro follicle development from the preantral stage onwards. LIF did not alter follicle growth or antrum formation, but it modulated the differentiation of granulosa cells, as revealed by decreased production of anti-Müllerian hormone and abolished FSH-induced stimulation of oestradiol secretion. This modulatory role was also reflected in the abundance of mRNA from 35 genes, analysed by reverse-transcription coupled to microfluidic quantitative PCR. LIF stimulated or at least maintained the expression of genes involved in the dialogue between the oocyte and granulosa cells, through gap junctions (GJA4 encoding connexin 37) or paracrine signalling (Bone morphogenetic protein 15, KIT ligand and their receptors). Finally, the presence of both LIF and FSH during follicle growth strongly improved oocyte meiotic competence: most oocytes (56%) underwent subsequent nuclear maturation, a significant increase compared with their counterparts from follicles of similar size (550-900 µm) cultured with FSH only (28%) or developed in vivo (9%). Their ability to sustain embryo development remains to be evaluated. Combined supplementation with FSH and LIF certainly merits investigation with human follicles.
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Affiliation(s)
- V Cadoret
- CNRS, IFCE, INRAE, Université de Tours, PRC, Nouzilly, France.,CHRU de Tours, Service de Médecine et Biologie de la Reproduction-CECOS, Tours, France
| | | | - P Papillier
- CNRS, IFCE, INRAE, Université de Tours, PRC, Nouzilly, France
| | - D Monniaux
- CNRS, IFCE, INRAE, Université de Tours, PRC, Nouzilly, France
| | - F Guérif
- CNRS, IFCE, INRAE, Université de Tours, PRC, Nouzilly, France.,CHRU de Tours, Service de Médecine et Biologie de la Reproduction-CECOS, Tours, France
| | - R Dalbies-Tran
- CNRS, IFCE, INRAE, Université de Tours, PRC, Nouzilly, France
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4
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Bourdon G, Cadoret V, Charpigny G, Couturier-Tarrade A, Dalbies-Tran R, Flores MJ, Froment P, Raliou M, Reynaud K, Saint-Dizier M, Jouneau A. Progress and challenges in developing organoids in farm animal species for the study of reproduction and their applications to reproductive biotechnologies. Vet Res 2021; 52:42. [PMID: 33691745 PMCID: PMC7944619 DOI: 10.1186/s13567-020-00891-w] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Accepted: 12/29/2020] [Indexed: 02/06/2023] Open
Abstract
Within the past decades, major progress has been accomplished in isolating germ/stem/pluripotent cells, in refining culture medium and conditions and in establishing 3-dimensional culture systems, towards developing organoids for organs involved in reproduction in mice and to some extent in humans. Haploid male germ cells were generated in vitro from primordial germ cells. So were oocytes, with additional support from ovarian cells and subsequent follicle culture. Going on with the female reproductive tract, spherical oviduct organoids were obtained from adult stem/progenitor cells. Multicellular endometrial structures mimicking functional uterine glands were derived from endometrial cells. Trophoblastic stem cells were induced to form 3-dimensional syncytial-like structures and exhibited invasive properties, a crucial point for placentation. Finally, considering the embryo itself, pluripotent embryonic cells together with additional extra-embryonic cells, could self-organize into a blastoid, and eventually into a post-implantation-like embryo. Most of these accomplishments have yet to be reached in farm animals, but much effort is devoted towards this goal. Here, we review the progress and discuss the specific challenges of developing organoids for the study of reproductive biology in these species. We consider the use of such organoids in basic research to delineate the physiological mechanisms involved at each step of the reproductive process, or to understand how they are altered by environmental factors relevant to animal breeding. We evaluate their potential in reproduction of animals with a high genetic value, from a breeding point of view or in the context of preserving local breeds with limited headcounts.
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Affiliation(s)
- Guillaume Bourdon
- INRAE, CNRS, Université de Tours, IFCE, PRC, 37380, Nouzilly, France
| | - Véronique Cadoret
- INRAE, CNRS, Université de Tours, IFCE, PRC, 37380, Nouzilly, France
- CHU Bretonneau, Médecine et Biologie de la Reproduction-CECOS, 37044, Tours, France
| | - Gilles Charpigny
- Université Paris-Saclay, UVSQ, INRAE, BREED, 78350, Jouy-en-Josas, France
- Ecole Nationale Vétérinaire D'Alfort, BREED, 94700, Maisons-Alfort, France
| | - Anne Couturier-Tarrade
- Université Paris-Saclay, UVSQ, INRAE, BREED, 78350, Jouy-en-Josas, France
- Ecole Nationale Vétérinaire D'Alfort, BREED, 94700, Maisons-Alfort, France
| | | | - Maria-José Flores
- Université Paris-Saclay, UVSQ, INRAE, BREED, 78350, Jouy-en-Josas, France
- Ecole Nationale Vétérinaire D'Alfort, BREED, 94700, Maisons-Alfort, France
| | - Pascal Froment
- INRAE, CNRS, Université de Tours, IFCE, PRC, 37380, Nouzilly, France
| | - Mariam Raliou
- Université Paris-Saclay, UVSQ, INRAE, BREED, 78350, Jouy-en-Josas, France
- Ecole Nationale Vétérinaire D'Alfort, BREED, 94700, Maisons-Alfort, France
| | - Karine Reynaud
- INRAE, CNRS, Université de Tours, IFCE, PRC, 37380, Nouzilly, France
| | - Marie Saint-Dizier
- INRAE, CNRS, Université de Tours, IFCE, PRC, 37380, Nouzilly, France
- Faculty of Sciences and Techniques, University of Tours, 37200, Tours, France
| | - Alice Jouneau
- Université Paris-Saclay, UVSQ, INRAE, BREED, 78350, Jouy-en-Josas, France.
- Ecole Nationale Vétérinaire D'Alfort, BREED, 94700, Maisons-Alfort, France.
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5
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Monniaux D, Genêt C, Maillard V, Jarrier P, Adriaensen H, Hennequet-Antier C, Lainé AL, Laclie C, Papillier P, Plisson-Petit F, Estienne A, Cognié J, di Clemente N, Dalbies-Tran R, Fabre S. Prenatal programming by testosterone of follicular theca cell functions in ovary. Cell Mol Life Sci 2020; 77:1177-1196. [PMID: 31327046 DOI: 10.1007/s00018-019-03230-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 07/11/2019] [Accepted: 07/15/2019] [Indexed: 12/22/2022]
Abstract
In mammalian ovaries, the theca layers of growing follicles are critical for maintaining their structural integrity and supporting androgen synthesis. Through combining the postnatal monitoring of ovaries by abdominal magnetic resonance imaging, endocrine profiling, hormonal analysis of the follicular fluid of growing follicles, and transcriptomic analysis of follicular theca cells, we provide evidence that the exposure of ovine fetuses to testosterone excess activates postnatal follicular growth and strongly affects the functions of follicular theca in adulthood. Prenatal exposure to testosterone impaired androgen synthesis in the small antral follicles of adults and affected the expression in their theca cells of a wide array of genes encoding extracellular matrix components, their membrane receptors, and signaling pathways. Most expression changes were uncorrelated with the concentrations of gonadotropins, steroids, and anti-Müllerian hormone in the recent hormonal environment of theca cells, suggesting that these changes rather result from the long-term developmental effects of testosterone on theca cell precursors in fetal ovaries. Disruptions of the extracellular matrix structure and signaling in the follicular theca and ovarian cortex can explain the acceleration of follicle growth through altering the stiffness of ovarian tissue. We propose that these mechanisms participate in the etiology of the polycystic ovarian syndrome, a major reproductive pathology in woman.
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Affiliation(s)
- Danielle Monniaux
- UMR Physiologie de la Reproduction et des Comportements, INRA, CNRS, IFCE, Université de Tours, 37380, Nouzilly, France.
| | - Carine Genêt
- GenPhySE, Université de Toulouse, INRA, INPT, ENVT, 31320, Castanet Tolosan, France
| | - Virginie Maillard
- UMR Physiologie de la Reproduction et des Comportements, INRA, CNRS, IFCE, Université de Tours, 37380, Nouzilly, France
| | - Peggy Jarrier
- UMR Physiologie de la Reproduction et des Comportements, INRA, CNRS, IFCE, Université de Tours, 37380, Nouzilly, France
| | - Hans Adriaensen
- UMR Physiologie de la Reproduction et des Comportements, INRA, CNRS, IFCE, Université de Tours, 37380, Nouzilly, France
| | | | - Anne-Lyse Lainé
- UMR Physiologie de la Reproduction et des Comportements, INRA, CNRS, IFCE, Université de Tours, 37380, Nouzilly, France
| | - Corinne Laclie
- UMR Physiologie de la Reproduction et des Comportements, INRA, CNRS, IFCE, Université de Tours, 37380, Nouzilly, France
| | - Pascal Papillier
- UMR Physiologie de la Reproduction et des Comportements, INRA, CNRS, IFCE, Université de Tours, 37380, Nouzilly, France
| | | | - Anthony Estienne
- UMR Physiologie de la Reproduction et des Comportements, INRA, CNRS, IFCE, Université de Tours, 37380, Nouzilly, France
| | - Juliette Cognié
- UMR Physiologie de la Reproduction et des Comportements, INRA, CNRS, IFCE, Université de Tours, 37380, Nouzilly, France
| | - Nathalie di Clemente
- Sorbonne Université, INSERM, Centre de Recherche Saint-Antoine (CRSA), 75012, Paris, France
| | - Rozenn Dalbies-Tran
- UMR Physiologie de la Reproduction et des Comportements, INRA, CNRS, IFCE, Université de Tours, 37380, Nouzilly, France.
| | - Stéphane Fabre
- GenPhySE, Université de Toulouse, INRA, INPT, ENVT, 31320, Castanet Tolosan, France
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6
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Monniaux D, Cadoret V, Clément F, Fabre S, Locatelli Y, Monget P, Dalbies-Tran R. 126 Regulation of initiation of follicle growth and dynamics of early follicular development in the sheep. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- D Monniaux
- Physiologie de la Reproduction et des Comportements, INRA, CNRS, IFCE, Université de Tours,37380, Nouzilly, France, Nouzilly, France
| | - V Cadoret
- PRC, CNRS, IFCE, INRA, Université de Tours,Nouzilly, France
| | - F Clément
- Project-team M3DISIM, Centre Inria Saclay Île-de-France,Palaiseau, France
| | - S Fabre
- GenPhySE, Université de Toulouse,INRA, INPT,ENVT, Castanet Tolosan,France, Toulouse, France
| | - Y Locatelli
- PRC, CNRS, IFCE, INRA, Université de Tours,Tours, France
| | - P Monget
- PRC, CNRS, IFCE, INRA, Université de Tours,Tours, France
| | - R Dalbies-Tran
- PRC, CNRS, IFCE, INRA, Université de Tours,Tours, France
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7
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Elis S, Desmarchais A, Cardona E, Fouchecourt S, Dalbies-Tran R, Nguyen T, Thermes V, Maillard V, Papillier P, Uzbekova S, Bobe J, Couderc JL, Monget P. Genes Involved in Drosophila melanogaster Ovarian Function Are Highly Conserved Throughout Evolution. Genome Biol Evol 2018; 10:2629-2642. [PMID: 30060195 PMCID: PMC6173279 DOI: 10.1093/gbe/evy158] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/26/2018] [Indexed: 12/11/2022] Open
Abstract
This work presents a systematic approach to study the conservation of genes between fruit flies and mammals. We have listed 971 Drosophila genes involved in female reproduction at the ovarian level and systematically looked for orthologs in the Ciona, zebrafish, coelacanth, lizard, chicken, and mouse. Depending on the species, the percentage of these Drosophila genes with at least one ortholog varies between 69% and 78%. In comparison, only 42% of all the Drosophila genes have an ortholog in the mouse genome (P < 0.0001), suggesting a dramatically higher evolutionary conservation of ovarian genes. The 177 Drosophila genes that have no ortholog in mice and other vertebrates correspond to genes that are involved in mechanisms of oogenesis that are specific to the fruit fly or the insects. Among 759 genes with at least one ortholog in the zebrafish, 73 have an expression enriched in the ovary in this species (RNA-seq data). Among 760 genes that have at least one ortholog in the mouse; 76 and 11 orthologs are reported to be preferentially and exclusively expressed in the mouse ovary, respectively (based on the UniGene expressed sequence tag database). Several of them are already known to play a key role in murine oogenesis and/or to be enriched in the mouse/zebrafish oocyte, whereas others have remained unreported. We have investigated, by RNA-seq and real-time quantitative PCR, the exclusive ovarian expression of 10 genes in fish and mammals. Overall, we have found several novel candidates potentially involved in mammalian oogenesis by an evolutionary approach and using the fruit fly as an animal model.
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Affiliation(s)
- Sebastien Elis
- UMR PRC, CNRS, IFCE, INRA, Université de Tours, Nouzilly, France
| | | | | | | | | | | | | | | | - Pascal Papillier
- UMR PRC, CNRS, IFCE, INRA, Université de Tours, Nouzilly, France
| | | | | | - Jean-Louis Couderc
- GReD Laboratory, Université Clermont Auvergne - CNRS UMR 6293- INSERM U1103, Clermont-Ferrand, France
| | - Philippe Monget
- UMR PRC, CNRS, IFCE, INRA, Université de Tours, Nouzilly, France
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Franciosi F, Goudet G, Tessaro I, Papillier P, Dalbies-Tran R, Reigner F, Deleuze S, Douet C, Miclea I, Lodde V, Luciano AM. In vitro maturation affects chromosome segregation, spindle morphology and acetylation of lysine 16 on histone H4 in horse oocytes. Reprod Fertil Dev 2018; 29:721-730. [PMID: 26651296 DOI: 10.1071/rd15350] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Accepted: 11/12/2015] [Indexed: 12/14/2022] Open
Abstract
Implantation failure and genetic developmental disabilities in mammals are caused by errors in chromosome segregation originating mainly in the oocyte during meiosis I. Some conditions, like maternal ageing or in vitro maturation (IVM), increase the incidence of oocyte aneuploidy. Here oocytes from adult mares were used to investigate oocyte maturation in a monovulatory species. Experiments were conducted to compare: (1) the incidence of aneuploidy, (2) the morphology of the spindle, (3) the acetylation of lysine 16 on histone H4 (H4K16) and (4) the relative amount of histone acetyltransferase 1 (HAT1), K(lysine) acetyltransferase 8 (KAT8, also known as MYST1), histone deacetylase 1 (HDAC1) and NAD-dependent protein deacetylase sirtuin 1 (SIRT1) mRNA in metaphase II stage oocytes that were in vitro matured or collected from peri-ovulatory follicles. The frequency of aneuploidy and anomalies in spindle morphology was increased following IVM, along with a decrease in H4K16 acetylation that was in agreement with our previous observations. However, differences in the amount of the transcripts investigated were not detected. These results suggest that the degradation of transcripts encoding for histone deacetylases and acetyltransferases is not involved in the changes of H4K16 acetylation observed following IVM, while translational or post-translational mechanisms might have a role. Our study also suggests that epigenetic instabilities introduced by IVM may affect the oocyte and embryo genetic stability.
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Affiliation(s)
- Federica Franciosi
- Reproductive and Developmental Biology Laboratory, Department of Health, Animal Science and Food Safety, University of Milan, via Celoria, 10, Milan, 20133, Italy
| | - Ghylene Goudet
- INRA, UMR85 Physiologie de la Reproduction et des Comportements, Nouzilly, F-37380, France
| | - Irene Tessaro
- Reproductive and Developmental Biology Laboratory, Department of Health, Animal Science and Food Safety, University of Milan, via Celoria, 10, Milan, 20133, Italy
| | - Pascal Papillier
- INRA, UMR85 Physiologie de la Reproduction et des Comportements, Nouzilly, F-37380, France
| | - Rozenn Dalbies-Tran
- INRA, UMR85 Physiologie de la Reproduction et des Comportements, Nouzilly, F-37380, France
| | | | - Stefan Deleuze
- Université de Liège, Clinique des Animaux de Compagnie et des Équidés, Place du 20 Août 7, Liège, 4000, Belgium
| | - Cecile Douet
- INRA, UMR85 Physiologie de la Reproduction et des Comportements, Nouzilly, F-37380, France
| | - Ileana Miclea
- University of Agricultural Sciences and Veterinary Medicine, Calea M?n?tur 3-5, Cluj-Napoca 400372, Romania
| | - Valentina Lodde
- Reproductive and Developmental Biology Laboratory, Department of Health, Animal Science and Food Safety, University of Milan, via Celoria, 10, Milan, 20133, Italy
| | - Alberto M Luciano
- Reproductive and Developmental Biology Laboratory, Department of Health, Animal Science and Food Safety, University of Milan, via Celoria, 10, Milan, 20133, Italy
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9
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Franciosi F, Tessaro I, Dalbies-Tran R, Douet C, Reigner F, Deleuze S, Papillier P, Miclea I, Lodde V, Luciano AM, Goudet G. Analysis of Chromosome Segregation, Histone Acetylation, and Spindle Morphology in Horse Oocytes. J Vis Exp 2017. [PMID: 28518085 DOI: 10.3791/55242] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The field of assisted reproduction has been developed to treat infertility in women, companion animals, and endangered species. In the horse, assisted reproduction also allows for the production of embryos from high performers without interrupting their sports career and contributes to an increase in the number of foals from mares of high genetic value. The present manuscript describes the procedures used for collecting immature and mature oocytes from horse ovaries using ovum pick-up (OPU). These oocytes were then used to investigate the incidence of aneuploidy by adapting a protocol previously developed in mice. Specifically, the chromosomes and the centromeres of metaphase II (MII) oocytes were fluorescently labeled and counted on sequential focal plans after confocal laser microscope scanning. This analysis revealed a higher incidence in the aneuploidy rate when immature oocytes were collected from the follicles and matured in vitro compared to in vivo. Immunostaining for tubulin and the acetylated form of histone four at specific lysine residues also revealed differences in the morphology of the meiotic spindle and in the global pattern of histone acetylation. Finally, the expression of mRNAs coding for histone deacetylases (HDACs) and acetyl-transferases (HATs) was investigated by reverse transcription and quantitative-PCR (q-PCR). No differences in the relative expression of transcripts were observed between in vitro and in vivo matured oocytes. In agreement with a general silencing of the transcriptional activity during oocyte maturation, the analysis of the total transcript amount can only reveal mRNA stability or degradation. Therefore, these findings indicate that other translational and post-translational regulations might be affected. Overall, the present study describes an experimental approach to morphologically and biochemically characterize the horse oocyte, a cell type that is extremely challenging to study due to low sample availability. However, it can expand our knowledge on the reproductive biology and infertility in monovulatory species.
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Affiliation(s)
- Federica Franciosi
- Department of Health, Animal Science and Food Safety, University of Milan;
| | - Irene Tessaro
- Department of Health, Animal Science and Food Safety, University of Milan; IRCCS. Istituto Ortopedico Galeazzi
| | | | | | | | - Stefan Deleuze
- Clinique des Animaux de Compagnie et des Équidés, Université de Liège
| | | | - Ileana Miclea
- University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca, Romania
| | - Valentina Lodde
- Department of Health, Animal Science and Food Safety, University of Milan
| | - Alberto M Luciano
- Department of Health, Animal Science and Food Safety, University of Milan
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10
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Angulo L, Guyader-Joly C, Auclair S, Hennequet-Antier C, Papillier P, Boussaha M, Fritz S, Hugot K, Moreews F, Ponsart C, Humblot P, Dalbies-Tran R. An integrated approach to bovine oocyte quality: from phenotype to genes. Reprod Fertil Dev 2015; 28:RD14353. [PMID: 25689671 DOI: 10.1071/rd14353] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2014] [Accepted: 01/07/2015] [Indexed: 11/23/2022] Open
Abstract
In cattle, early embryonic failure plays a major role in the limitation of reproductive performance and is influenced by genetic effects. Suboptimal oocyte quality, including an inadequate store of maternal factors, is suspected to contribute to this phenomenon. In the present study, 13 Montbeliarde cows were phenotyped on oocyte quality, based on their ability to produce viable embryos after in vitro maturation, fertilisation and culture for 7 days. This discriminated two groups of animals, exhibiting developmental rates below 18.8% or above 40.9% (relative to cleaved embryos). Using microarrays, transcriptomic profiles were compared between oocytes collected in vivo from these two groups of animals. The difference in oocyte development potential was associated with changes in transcripts from 60 genes in immature oocytes and 135 genes in mature oocytes (following Bonferroni 5% correction). Of these, 16 and 32 genes were located in previously identified fertility quantitative trait loci. A subset of differential genes was investigated on distinct samples by reverse transcription-quantitative polymerase chain reaction. For SLC25A16, PPP1R14C, ROBO1, AMDHD1 and MEAF6 transcripts, differential expression was confirmed between high and low oocyte potential animals. Further sequencing and searches for polymorphisms will pave the way for implementing their use in genomic selection.
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León K, Gallay N, Poupon A, Reiter E, Dalbies-Tran R, Crepieux P. Integrating microRNAs into the complexity of gonadotropin signaling networks. Front Cell Dev Biol 2013; 1:3. [PMID: 25364708 PMCID: PMC4206998 DOI: 10.3389/fcell.2013.00003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Accepted: 12/12/2013] [Indexed: 12/13/2022] Open
Abstract
Follicle-stimulating hormone (FSH) is a master endocrine regulator of mammalian reproductive functions. Hence, it is used to stimulate folliculogenesis in assisted reproductive technologies (ART), both in women and in breeding animals. However, the side effects that hormone administration induces in some instances jeopardize the success of ART. Similarly, the luteinizing hormone (LH) is also of paramount importance in the reproductive function because it regulates steroidogenesis and the LH surge is a pre-requisite to ovulation. Gaining knowledge as extensive as possible on gonadotropin-induced biological responses could certainly lead to precise selection of their effects in vivo by the use of selective agonists at the hormone receptors. Hence, over the years, numerous groups have contributed to decipher the cellular events induced by FSH and LH in their gonadal target cells. Although little is known on the effect of gonadotropins on microRNA expression so far, recent data have highlighted that a microRNA regulatory network is likely to superimpose on the signaling protein network. No doubt that this will dramatically alter our current understanding of the gonadotropin-induced signaling networks. This is the topic of this review to present this additional level of complexity within the gonadotropin signaling network, in the context of recent findings on the microRNA machinery in the gonad.
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Affiliation(s)
- Kelly León
- BIOS Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
| | - Nathalie Gallay
- BIOS Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
| | - Anne Poupon
- BIOS Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
| | - Eric Reiter
- BIOS Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
| | - Rozenn Dalbies-Tran
- BINGO Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
| | - Pascale Crepieux
- BIOS Group, INRA, UMR85, Unité Physiologie de la Reproduction et des Comportements, Nouzilly, France; CNRS, UMR7247, Nouzilly, France; Université François Rabelais Tours, France
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Auclair S, Uzbekov R, Elis S, Sanchez L, Kireev I, Lardic L, Dalbies-Tran R, Uzbekova S. Absence of cumulus cells during in vitro maturation affects lipid metabolism in bovine oocytes. Am J Physiol Endocrinol Metab 2013; 304:E599-613. [PMID: 23321473 DOI: 10.1152/ajpendo.00469.2012] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Cumulus cells (CC) surround the oocyte and are coupled metabolically through regulation of nutrient intake. CC removal before in vitro maturation (IVM) decreases bovine oocyte developmental competence without affecting nuclear meiotic maturation. The objective was to investigate the influence of CC on oocyte cytoplasmic maturation in relation to energy metabolism. IVM with either cumulus-enclosed (CEO) or -denuded (DO) oocytes was performed in serum-free metabolically optimized medium. Transmission electron microscopy revealed different distribution of membrane-bound vesicles and lipid droplets between metaphase II DO and CEO. By Nile Red staining, a significant reduction in total lipid level was evidenced in DO. Global transcriptomic analysis revealed differential expression of genes regulating energy metabolism, transcription, and translation between CEO and DO. By Western blot, fatty acid synthase (FAS) and hormone-sensitive phospholipase (HSL) proteins were detected in oocytes and in CC, indicating a local lipogenesis and lypolysis. FAS protein was significantly less abundant in DO that in CEO and more highly expressed in CC than in the oocytes. On the contrary, HSL protein was more abundant in oocytes than in CC. In addition, active Ser⁵⁶³-phosphorylated HSL was detected in the oocytes only after IVM, and its level was similar in CEO and DO. In conclusion, absence of CC during IVM affected lipid metabolism in the oocyte and led to suboptimal cytoplasmic maturation. Thus, CC may influence the oocyte by orienting the consumption of nutritive storage via regulation of local fatty acid synthesis and lipolysis to provide energy for maturation.
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Affiliation(s)
- Sylvain Auclair
- UMR85 Physiologie de la Reproduction et des Comportements, Institut National de la Recherche Agronomique, Nouzilly, France
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Salhab M, Dhorne-Pollet S, Auclair S, Guyader-Joly C, Brisard D, Dalbies-Tran R, Dupont J, Ponsart C, Mermillod P, Uzbekova S. In vitro maturation of oocytes alters gene expression and signaling pathways in bovine cumulus cells. Mol Reprod Dev 2013; 80:166-82. [PMID: 23280668 DOI: 10.1002/mrd.22148] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 12/17/2012] [Indexed: 12/24/2022]
Abstract
In vitro maturation (IVM) of immature oocytes is widely used in assisted reproduction technologies in cattle, and is increasingly used to treat human infertility. The development competence of IVM oocytes, however, is lower than preovulatory, in vivo-matured oocytes. During maturation, cumulus cells (CC) are metabolically coupled with an oocyte and support the acquisition of its developmental potential. Our objective was to identify genes and pathways that were affected by IVM in bovine CC. Microarray transcriptomic analysis of CC enclosing in vitro- or in vivo-mature oocytes revealed 472 differentially expressed genes, including 28% related to apoptosis, correlating with twofold higher cell death after IVM than in vivo, as detected by TUNEL. Genes overexpressed after IVM were significantly enriched in functions involved in cell movement, focal adhesion, extracellular matrix function, and TGF-beta signaling, whereas under-expressed genes were enriched in regulating gene expression, energy metabolism, stress response, and MAP kinases pathway functions. Differential expression of 15 genes, including PAG11 (increased) and TXNIP (decreased), which were never detected in CC before, was validated by real-time RT-PCR. Moreover, protein quantification confirmed the lower abundance of glutathione S-transferase A1 and prostaglandin G/H synthase 2, and the higher abundance of hyaluronan synthase 2 and SMAD4, a member of TGF-beta pathway, in CC after IVM. Phosphorylation levels of SMAD2, MAPK3/1, and MAPK14, but not MAPK8, were higher after IVM that in vivo. In conclusion, IVM provokes the hyper-activation of TGF-beta and MAPK signaling components, modifies gene expression, leads to increased apoptosis in CC, and thus affects oocyte quality.
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Affiliation(s)
- Mohamad Salhab
- INRA, UR85 Physiologie de la Reproduction et des Comportements, Nouzilly, France
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14
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Angulo L, Perreau C, Lakhdari N, Uzbekov R, Papillier P, Freret S, Cadoret V, Guyader-Joly C, Royere D, Ponsart C, Uzbekova S, Dalbies-Tran R. Breast-cancer anti-estrogen resistance 4 (BCAR4) encodes a novel maternal-effect protein in bovine and is expressed in the oocyte of humans and other non-rodent mammals. Hum Reprod 2012. [PMID: 23202989 DOI: 10.1093/humrep/des412] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
STUDY QUESTION Does BCAR4 have a role in mammalian embryo development? SUMMARY ANSWER Expression, localization and functional data support that BCAR4 is a maternal-effect protein in non-rodent mammals. WHAT IS KNOWN ALREADY BCAR4 was previously identified as an oocyte-specific gene in cattle, and as a marker of certain breast tumors in humans. STUDY DESIGN, SIZE, DURATION Human oocytes were obtained from patients undergoing IVF, but had failed to mature after ovarian stimulation. Dog oocytes were obtained from ovariectomized bitches. Pig, horse and bovine ovaries were obtained from commercial slaughterhouses for extraction of immature oocyte-cumulus complexes. In vivo matured bovine matured oocytes were obtained after ovulation induction and ovulation inducing treatment of Montbeliard heifers. MATERIALS, SETTING AND METHODS Expression at the RNA level was analyzed by reverse transcription coupled to polymerase chain reaction. Western blot and immunolabeling coupled to confocal or electronic microscopy were used to analyze bovine protein expression and intracellular localization. For the functional approach, short-interfering RNA were microinjected into mature bovine oocytes, followed by IVF; cleavage and embryo development were recorded. MAIN RESULTS AND THE ROLE OF CHANCE The BCAR4 gene is conserved in mammalian species from various orders and has been lost in rodents after divergence with lagomorphs. The transcript is expressed in the oocytes of humans and domestic species. We bring the first experimental evidence of the BCAR4 protein in mammals. In cattle, the protein is not detected in immature oocytes but starts to be synthesized during maturation, increases in the zygote and persists until the morula stage. The protein is detected throughout the cytoplasm in mature oocytes, concentrates in and around the pronuclei in the zygote, and appears to shuttle in and out of the nuclei starting in the 2-cell embryo; BCAR4 is also present at the junctions between blastomeres from 2-cell to morula. In our functional approach, targeting the BCAR4 transcript by small-interfering RNA significantly compromised development to the morula or/and blastocyst stages (P < 0.05, logistic regression). LIMITATIONS, REASONS FOR CAUTION As indicated above, protein expression and function were investigated in cattle and mostly in vitro matured oocytes were used. WIDER IMPLICATIONS OF THE FINDINGS This study provides a novel candidate gene whose mutation or deregulation may underlie certain cases of unexplained female infertility.
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Affiliation(s)
- L Angulo
- INRA, UMR85 Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, France
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Monget P, Bobe J, Gougeon A, Fabre S, Monniaux D, Dalbies-Tran R. The ovarian reserve in mammals: a functional and evolutionary perspective. Mol Cell Endocrinol 2012; 356:2-12. [PMID: 21840373 DOI: 10.1016/j.mce.2011.07.046] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Revised: 07/25/2011] [Accepted: 07/27/2011] [Indexed: 01/15/2023]
Abstract
The constitution and the control of the ovarian reserve is of importance in mammals and women. In particular, the number of primordial follicles at puberty is positively correlated with the number of growing follicles and their response to gonadotropin treatments. The size of this ovarian reserve depends on genes involved in germ cell proliferation and differentiation, sexual differentiation, meiosis, germ cell degeneration, formation of primordial follicles, and on a potential mechanism of self-renewal of germ stem cells. In this review, we present the state of the art of the knowledge of genes and factors involved in all these processes. We first focus on the almost 70 genes identified mainly by mouse invalidation models, then we discuss the most plausible hypothesis concerning the possibility of the existence of germ cell self-renewal by neo-oogenesis in animal species and human, with a special interest for the role of corresponding genes in evolutionary distinct model species. All of the genes pointed out here are candidates susceptible to explain fertility defects such as the premature ovarian failure in human.
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Affiliation(s)
- Philippe Monget
- INRA, UMR85, Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, France.
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16
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Royère D, Feuerstein P, Cadoret V, Puard V, Uzbekova S, Dalbies-Tran R, Teusan R, Houlgatte R, Labas V, Guérif F. Approches non invasives de l’embryon : protéomique, métabolomique, dialogue ovocyte-cumulus. ACTA ACUST UNITED AC 2009; 37:917-20. [DOI: 10.1016/j.gyobfe.2009.09.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2009] [Accepted: 09/03/2009] [Indexed: 10/20/2022]
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17
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Thelie A, Papillier P, Perreau C, Uzbekova S, Hennequet-Antier C, Dalbies-Tran R. Regulation of bovine oocyte-specific transcripts during in vitro oocyte maturation and after maternal-embryonic transition analyzed using a transcriptomic approach. Mol Reprod Dev 2009; 76:773-82. [PMID: 19343788 DOI: 10.1002/mrd.21031] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Oocyte/embryo genomics in mammals faces specific challenges due to limited biological material, to the comparison of models with different total RNA contents, and to expression of a specific set of genes often absent from commercially available microarrays. Here, we report experimental validation of a RNA amplification protocol for bovine oocytes and blastocysts. Using real-time PCR, we have confirmed that the profile of both abundant and scarce polyadenylated transcripts was conserved after RNA amplification. Next, amplified probes generated from immature oocytes, in vitro matured oocytes, and in vitro produced hatched blastocysts were hybridized onto a macroarray that included oocyte-specific genes. Following an original approach, we have compared two normalization procedures, based on the median signal or an exogenous standard. We have evidenced the expected difference in sets of differential genes depending on the normalization procedure. Using a 1.5-fold threshold, no transcript was found to be upregulated when data were normalized to an exogenous standard, which reflects the absence of transcription during in vitro oocyte maturation. In blastocysts, the majority of oocyte-preferentially expressed genes were not activated, as previously observed in mouse. Finally, microarray data were validated by real-time PCR on a random subset of genes. Our study sheds new light on and complements previous transcriptomic analyses of bovine oocyte to embryo transition using commercial platforms.
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Affiliation(s)
- Aurore Thelie
- INRA UMR Physiologie de la Reproduction et des Comportements, CNRS UMR, Université de Tours, Haras Nationaux, Nouzilly, France
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De Santis T, Casavola V, Reshkin SJ, Guerra L, Ambruosi B, Fiandanese N, Dalbies-Tran R, Goudet G, Dell'Aquila ME. The extracellular calcium-sensing receptor is expressed in the cumulus-oocyte complex in mammals and modulates oocyte meiotic maturation. Reproduction 2009; 138:439-52. [PMID: 19494043 DOI: 10.1530/rep-09-0078] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The extracellular calcium-sensing receptor (CASR) plays an important role in cells involved in calcium (Ca2+) homeostasis by directly sensing changes in the extracellular Ca2+ ion concentration. We previously reported the localization and quantitative expression of CASR protein in human oocytes. In this study, we examined the expression and the functional role of CASR during oocyte meiotic maturation in a large mammal animal model, the horse. As in humans, CASR protein was found to be expressed in equine oocytes and cumulus cells. Western-blot analysis revealed a single 130 kDa band in denuded oocytes and a doublet of 130-120 kDa in cumulus cells. CASR labeling was observed by confocal microscopy in cumulus cells and in oocytes on the plasma membrane and within the cytoplasm at all examined stages of meiosis. Functionally, the CASR allosteric effector NPS R-467, in the presence of 2.92 mM external Ca2+, increased oocyte maturation rate in a dose-dependent manner and its stimulatory effect was attenuated by pre-treatment with the CASR antagonist NPS 2390. NPS R-467 had no effect in suboptimal external Ca2+ (0.5 mM), indicating that it requires higher external Ca2+ to promote oocyte maturation. In oocytes treated with NPS R-467, CASR staining increased at the plasmalemma and was reduced in the cytosol. Moreover, NPS R-467 increased the activity of MAPK, also called ERK, in cumulus cells and oocytes. These results provide evidence of a novel signal transduction pathway modulating oocyte meiotic maturation in mammals in addition to the well-known systemic hormones.
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Affiliation(s)
- Teresa De Santis
- Department of Animal Production, University of Bari, 70010 Valenzano, Bari, Italy
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Feuerstein P, Cadoret V, Dalbies-Tran R, Guerif F, Bidault R, Royere D. Gene expression in human cumulus cells: one approach to oocyte competence. Hum Reprod 2007; 22:3069-77. [PMID: 17951581 DOI: 10.1093/humrep/dem336] [Citation(s) in RCA: 169] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Dialogue between the oocyte and cumulus cells is essential for oocyte maturation. A prospective laboratory research project was designed to evaluate transcription of specific genes in cumulus cells harvested before intracytoplasmic sperm injection from pre-ovulatory follicles, according to individual oocyte nuclear maturity and developmental competence. Genes were chosen because their expression was induced by the LH peak [Steroidogenic Acute Regulatory protein (STAR), Cyclooxygenase 2 (COX2 or PTGS2), Amphiregulin (AREG)] or because they were involved in oocyte lipidic metabolism [Stearoyl-Coenzyme A Desaturase 1 and 5 (SCD1 and SCD5)] or in gap-junctions [Connexin 43 (CX43 or GJA1)]. METHODS mRNA levels in cumulus cells were assessed by real-time PCR. RESULTS Expression levels of all genes investigated, except Cx43, were increased after resumption of meiosis. Nuclear maturation was thus associated with increased expression of STAR, COX2, AREG, SCD1 and SCD5 by cumulus cells. When considering only cumulus associated with metaphase II oocytes, gene expression was independent of morphological status at Day 2. In contrast, transcript levels were lower and distributed over a narrower range in cumulus enclosing oocytes achieving blastocyst development at Day 5/6 than in cumulus enclosing oocytes unable to develop beyond the embryo stage. CONCLUSION Further developmental potential from embryo to blastocyst stage was associated with lower expression in a narrow range for these genes.
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Affiliation(s)
- P Feuerstein
- INRA, CNRS, Université de Tours, Haras Nationaux, UMR Physiologie de la Reproduction et des Comportements, 37380 Nouzilly, France
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Abstract
The dialog between oocyte and cumulus cells brings a major contribution for oocyte meiotic and developmental competence. On the one hand, the oocyte will modulate follicle growth through specific gene expression (Figalpha, GDF-9, BMP15) as well as its meiosis (GPR3 et PDE3A). Beyond its action on proliferation, oocyte will control in part the differentiation of cumulus cells with a particular involvement of GDF-9, BMP15 in this late maturation process. On the other hand, somatic cells are the main targets of gonadotropins and will modulate both oocyte growth and maturation. Gap-junctions between oocyte and cumulus cells have a major role in this interaction, since they allow the action of some oocyte specific genes (GDF9) but also the control of its own metabolism and calcium movements. While ovulation will involve gonadotropins action on somatic cells, EGF-like factors recruited at the cumulus level will participate in this process. Finally we may suspect that improving the knowledge on oocyte-cumulus dialog will contribute to better define oocyte competence, while bringing some clues for in vitro maturation.
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Affiliation(s)
- P Feuerstein
- INRA-UMR 6175, centre de Tours, 37380 Nouzilly, France.
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Abstract
The ATF7 proteins, which are members of the cyclic AMP responsive binding protein (CREB)/activating transcription factor (ATF) family of transcription factors, display quite versatile properties: they can interact with the adenovirus E1a oncoprotein, mediating part of its transcriptional activity; they heterodimerize with the Jun, Fos or related transcription factors, likely modulating their DNA-binding specificity; they also recruit to the promoter a stress-induced protein kinase (JNK2). In the present study, we investigate the functional relationships of ATF7 with hsTAF12 (formerly hsTAF(II)20/15), which has originally been identified as a component of the general transcription factor TFIID. We show that overexpression of hsTAF12 potentiates ATF7-induced transcriptional activation through direct interaction with ATF7, suggesting that TAF12 is a functional partner of ATF7. In support of this conclusion, chromatin immunoprecipitation experiments confirm the interaction of ATF7 with TAF12 on an ATF7-responsive promoter, in the absence of any artificial overexpression of both proteins. We also show that the TAF12-dependent transcriptional activation is competitively inhibited by TAF4. Although both TAF12 isoforms (TAF12-1 and -2, formerly TAF(II)20 and TAF(II)15) interact with the ATF7 activation region through their histone-fold domain, only the largest, hsTAF12-1, mediates transcriptional activation through its N-terminal region.
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Affiliation(s)
- Pierre-Jacques Hamard
- Ecole Supérieure de Biotechnologie de Strasbourg, Université Louis Pasteur, Parc d'innovation, UMR7100 CNRS-ULP, Bd. Sebastien Brant-BP10413, 67412 Strasbourg, Illkirch Cedex, France
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