Tight gene co-expression between oocyte and surrounding cumulus is critical for oocyte developmental competence
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ABSTRACT:
PROVIDER: PRJNA818914 | ENA |
REPOSITORIES: ENA
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Project description:Cytoplasmic and nuclear maturation of oocytes as well as interaction with the surrounding cumulus cells are important features relevant to the acquisition of developmental competence. We used brilliant cresyl blue (BCB) to distinguish oocytes with low activity of the enzyme Glucose-6-Phosphate Dehydrogenase, and thus separated fully grown (BCB+) oocytes from those in the growing phase (BCB-). The BCB+ oocytes are twice as likely to produce a blastocyst in vitro compared to BCB- oocytes (P<0.01). We analyzed mitochondrial DNA (mtDNA) copy number in single oocytes and determined that BCB- oocytes have 1.3-fold more copies than BCB+ oocytes (P=0.004). We also interrogated the transcriptome of oocytes and surrounding cumulus cells of BCB+ versus BCB- oocytes. There was no differential transcript abundance of genes expressed in oocytes, but we identified 172 genes in cumulus cells with differential transcript abundance (FDR<0.05) based on the BCB staining of their oocyte. Differential gene co-expression analysis between BCB+ and BCB- oocytes and their surrounding cumulus cells revealed dynamic coordination of transcript abundance between both compartments of the cumulus-oocyte complex. We identified a subset of genes whose co-expression in fully grown oocytes (n=75) and their surrounding cumulus cells (n=108) compose a unique profile of the cumulus-oocyte complex. In conclusion, as oocytes transition from growing to fully grown, there is an increase in the likelihood of producing a blastocyst, a reduction of mtDNA copies and no systematic variation of transcript abundance. Cumulus cells present changes in transcript abundance, which reflects in a dynamic co-expression between oocyte and cumulus cells.
2022-03-28 | GSE199210 | GEO
Project description:Cumulus cells surrounding the oocyte were sampled at the following stages: developmentally incompetent or poorly competent prophase I oocytes (NC1 oocytes), developmentally competent prophase I oocytes (C1 oocytes), and developmentally competent metaphase II oocytes (C2 oocytes). NC1 samples were collected from immature, unexpanded cumulus-oocytes complexes (COC) from prepubertal (3-week-old) mice, C1 samples from immature, unexpanded cumulus-oocytes complexes (COC) from adult (8-week-old) and C2 samples from mature, expanded COCs obtained from the oviduct from 8-week-old mice after standard superovulation protocol. Global transcriptional profiling was performed using cumulus cells collected from murine ovarian follicles during in vivo oocyte developmental competence acquisition. Cumulus cells were collected at 3 stages: early stage follicles (prophase I arrested oocytes, meiotically competent but developmentally incompetent, n=5), late stage follicles (prophase I arrested oocytes, meiotically competent and developmentally competent, n=5) and ovulatory follicles collected in vivo (metaphase II arrested oocytes, developmentally fully competent, n=5).
2012-10-14 | E-GEOD-36604 | biostudies-arrayexpress
Project description:Somatic cells surrounding the oocyte were sampled at the following stages: developmentally incompetent or poorly competent prophase I oocytes (NC1 oocytes), developmentally competent prophase I oocytes (C1 oocytes), and developmentally competent metaphase II oocytes (C2 oocytes). NC1 cumulus cells (CC) were sampled from immature calf oocytes, C1 samples from immature cow oocytes, and C2 samples from in vivo matured cow oocytes. Global transcriptional profiling was performed using cumulus cells collected from bovine ovarian follicles during in vivo oocyte developmental competence acquisition. Cumulus cells were collected at 3 stages: early stage follicles (prophase I arrested oocytes, meiotically competent but developmentally incompetent, n=6), late stage follicles (prophase I arrested oocytes, meiotically competent and developmentally competent, n=6) and ovulatory follicles collected by ovum pick-up (OPU) in vivo (metaphase II arrested oocytes, developmentally fully competent, n=5).
2012-10-14 | E-GEOD-36605 | biostudies-arrayexpress
Project description:The maturation of an oocyte, the female gamete, during folliculogenesis is highly dependent on the molecular interaction with the somatic cells. Here we generated transcriptome data of single oocytes and the surrounding cumulus cells from antral follicles, and developed an analytical framework to unveil their inter-cellular communication. We identified hundreds of ligand-receptors pairs that can transduce paracrine signaling between oocyte and cumulus. Several of the ligand-coding genes expressed in oocytes and cumulus cells are also functionally associated with regulation of transcription. Ligand-coding genes expressed in oocytes or cumulus showed distinct enrichment for biological functions that are likely associated with a coordinated formation of the transzonal projections from the cumulus that reach the oocyte’s membrane. Finally, there were thousands of gene pairs with non-trivial linear co-expression pattern between oocytes and cumulus cells. Our analyses revealed a complex and functional regulatory circuit between the oocyte and surrounding cumulus cells.
2017-06-21 | GSE99678 | GEO
Project description:The oocyte forms a complex with their somatic cumulus cells within the follicle throughout the preovulatory maturation steps. Cumulus cells support their oocyte not only through mechanical protection but also with a close bidirectional exchange of metabolites. Analysis of the oocytes cumulus gives the opportunity to explore non-invasively oocytal well-being and quality. In vitro maturation (IVM) is the first rate-limiting step in in vitro embryo production. Analysis of protein expression in cumulus cells around this critical step helps to explore the impact of maturation conditions and to examine an influence on maturational competence of the oocyte. The goal of this study was the comparison of the cumulus proteome of oocytes with and without maturational competence matured under in vivo and in vitro conditions. Therefore twenty cumulus samples corresponding to single oocytes were analysed. Half of the samples were matured in vivo and the other half in vitro. For each maturation group, cumulus from oocytes matured successfully (SM; n=5) and failed to mature (FM; n=5) were analysed.
2020-06-30 | PXD016679 | Pride
Project description:This SuperSeries is composed of the following subset Series: GSE36602: Transcriptional profiling of somatic cells differentiation throughout oocyte competence acquisition in rainbow trout ovarian follicles. GSE36603: Transcriptional profiling of somatic cells differentiation throughout oocyte competence acquisition in the xenopus ovarian follicles. GSE36604: Transcriptional profiling of cumulus cells differentiation throughout oocyte competence acquisition in the murine ovarian follicles. GSE36605: Transcriptional profiling of cumulus cells differentiation throughout oocyte competence acquisition in the bovine ovarian follicles. Refer to individual Series
2012-10-14 | E-GEOD-36617 | biostudies-arrayexpress
Project description:The present study was undertaken to discover molecular markers in bovine cumulus cells predictive of oocyte competence and elucidate their functional significance. Differences in RNA transcript abundance in cumulus cells harvested from oocytes of adult versus prepubertal animals (model of poor oocyte quality) were identified by microarray analysis. Four genes of interest encoding for the lysosomal cysteine proteinases cathepsin B, S, K and Z and displaying greater transcript abundance in cumulus cells surrounding oocytes harvested from prepubertal animals were chosen for further investigation. Greater mRNA abundance for such genes in cumulus cells of prepubertal oocytes was confirmed by real time RT-PCR. Elevated transcript abundance for cathepsins B, S and Z was also observed in cumulus cells surrounding adult metaphase II oocytes that developed to the blastocyst stage at a low percentage following parthenogenetic activation, versus those that developed at a high percentage. Functional significance of cumulus cell cathepsin expression to oocyte competence was confirmed by treatment of cumulus oocyte complexes during in vitro oocyte maturation with a cell permeable cysteine proteinase (cathepsin) inhibitor. Inhibitor treatment decreased apoptotic nuclei in the cumulus layer and enhanced development of parthenogenetically activated and in vitro fertilized adult oocytes to the blastocyst stage. Stimulatory effects of inhibitor treatment during meiotic maturation on subsequent embryonic development were not observed when oocytes were matured in the absence of cumulus cells. Results support a functional role for cumulus cell cathepsins in compromised oocyte competence and suggest that cumulus cell cathepsin mRNA abundance may be predictive of oocyte quality. Keywords: Bovine, microarray, cDNA, cumulus cells
2008-03-18 | GSE10819 | GEO
Project description:<p>The metabolic profile of follicular fluid (FF) has been investigated to look for biomarkers for oocyte quality. Resolvin E1 (RvE1), a potent pro-resolving mediator, was reported to have protective action in cell function. The study aimed to examine the predictive value of RvE1 for oocyte quality and to explore the cellular mechanism of RvE1 in improving oocyte competence. Metabolic profiles of 80 FF samples showed a higher level of RvE1 in group A (blastocysts scored ≥ B3BC and B3CB according to Gardner's blastocyst scoring system, N=36) than that of group B (blastocysts scored < B3BC and B3CB, N=44, P=.0018). The receiver operating characteristic (ROC) curve analysis showed that RvE1 level in FF below 8.96 pg/ml (AUC:0.75; 95%CI: 0.64 – 0.86; P=.00012) could predict poor oocyte quality with specificity of 97.22%, suggesting RvE1 as a potential biomarker to exclude inferior oocytes. Besides, the level of RvE1 was found to be significantly lower in FF than in serum (57.49 to 17.62 pg/ml; P=.0037) and was gradually accumulated in the culture medium of cumulus cells (CCs) during cell culture, which indicated that RvE1 came from both blood exudates and local secretion. The in vitro experiment revealed the cellular mechanism of RvE1 in improving oocyte quality by decreasing the cumulus cell apoptotic rate and increasing cell viability and proliferation. It is the first time that the role of RvE1 in reproduction is explored. In conclusion, RvE1 is valuable as a potential exclusive biomarker for oocyte selection and plays a role in improving oocyte quality.</p>
2020-03-26 | MTBLS1488 | MetaboLights
Project description:Cumulus cells are biologically distinct from other follicular cells and perform specialized roles, transmitting signals within the ovary and supporting oocyte maturation during follicular development. The bi-directional communication between the oocyte and the surrounding cumulus cells is crucial for the acquisition of oocyte competence. Using Illumina/deep-sequencing technology, we dissected the small RNAome of pooled human mature MII oocytes and cumulus cells.
2015-04-10 | GSE44792 | GEO
Project description:Cumulus cells surrounding the oocyte were sampled at the following stages: developmentally incompetent or poorly competent prophase I oocytes (NC1 oocytes), developmentally competent prophase I oocytes (C1 oocytes), and developmentally competent metaphase II oocytes (C2 oocytes). NC1 samples were collected from immature, unexpanded cumulus-oocytes complexes (COC) from prepubertal (3-week-old) mice, C1 samples from immature, unexpanded cumulus-oocytes complexes (COC) from adult (8-week-old) and C2 samples from mature, expanded COCs obtained from the oviduct from 8-week-old mice after standard superovulation protocol.
2012-10-14 | GSE36604 | GEO