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Transcriptomes of human oocytes during in vitro maturation

ABSTRACT: Transcriptomes of human oocytes during in vitro maturation

PROVIDER: PRJNA701233 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13676018_1.fastq.gz	Fastqsanger.gz
	SRR13676018_2.fastq.gz	Fastqsanger.gz
	SRR13676019_1.fastq.gz	Fastqsanger.gz
	SRR13676019_2.fastq.gz	Fastqsanger.gz
	SRR13676020_1.fastq.gz	Fastqsanger.gz

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Transcriptomes of human oocytes during in vitro maturation

Project description:We aimed to reveal gene expression profiles of human oocytes at each maturation stage by single cell RNA-seq analyses. We investigated transcriptomes of immature oocytes at the germinal vesicle (GV) stage, maturating oocytes at the metaphase I (MI) stage and in vitro matured oocytes at the metaphase II (MII) stage.

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Project description:We discovered that mouse oocytes contain novel non-membrane-bound organelles, which we named EndoLysosomal Vesicular Assemblies (ELVAs). ELVAs contain endolysosomal and autophagy vesicles, as well as proteasomes. In immature oocytes, ELVAs store ubiquitinated proteins and show little degradative activity. During oocyte maturation, ELVAs increase protein degradation, thereby degrading the stored proteins. To understand which proteins are being degraded inside ELVAs during oocyte maturation we treated mouse oocytes with or without the lysosomal inhibitor Bafilomycin A1 (BafA1) during maturation and subjected equal number of in vitro matured oocytes to mass spec, looking for enriched proteins in the BafA1-treated sample.

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Single-cell quantitative proteomic analysis of oocyte maturation revealed high heterogeneities in human in vitro matured oocytes

Project description:In this study we investigated the protein expression patterns during human oocyte in vitro and in vivo maturation (IVO) by single-cell quantitative proteomic analysis of 36 human oocytes. Among 2,094 proteins quantified in 34 oocytes (GV: 11 oocytes, IVM: 12 oocytes, IVO: 11 oocytes), 224 were differential between IVO and GV oocytes during in vivo maturation, and 61 between IVM and IVO oocytes.

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Project description:In vitro oocyte maturation (IVM) holds great promise as a tool for enhancing clinical treatment of infertility, enhancing availability of non human primates for development of disease models, and facilitating endangered species preservation. However, IVM outcomes have remained significantly below success rates obtained using in vivo matured (VVM) oocytes from humans and non human primates. A cDNA array based analysis is presented, comparing the transcriptomes of VVM oocytes with IVM oocytes. We observe a small set of just 59 mRNAs that are differentially expressed between the two cell types. These mRNAs are related to cellular homeostasis, cell-cell interactions including growth factor and hormone stimulation and cell adhesion, and other functions such as mRNA stability and translation. Additionally, we observe in IVM oocytes overexpression of PLAGL1 and MEST, two maternally imprinted genes, indicating a possible interruption or loss of correct epigenetic programming. These results indicate that, under certain IVM conditions, oocytes that are molecularly highly similar to VVM oocytes can be obtained, however the interruption of normal oocyte-somatic cell interactions during the final hours of oocyte maturation may preclude the establishment of full developmental competence. Keywords: oocyte maturation Comparison of in vitro matured MII-stage oocytes (4 biological replicates) with in vivo matured MII-stage oocytes (4 biological replicates)

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Project description:While the oocytes’ transcriptome is predominantly determined by maturation stage, transcripts related to specific pathways such as chromosome segregation, mitochondria and RNA processing are affected by age after in vitro maturation of denuded oocytes.

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Project description:The aim of this study was to analyze transcriptome profiles with RNA sequencing (RNA-seq) in metaphase II horse oocytes after vitrification before and after in vitro maturation (IVM). To do so, transcriptome profile of three groups were compared: (1) oocytes vitrified immature, warmed, and in vitro matured (VGV), (2) in vitro matured and vitrified (VMAT), and (3) fresh oocytes (CONTROL).

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