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Transcriptomic analysis of mouse preimplantation embryo development and nutrient provision

ABSTRACT: Transcriptomic analysis of mouse preimplantation embryo development and nutrient provision

PROVIDER: PRJNA669038 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12819300.fastq.gz	Fastqsanger.gz
	SRR12819301.fastq.gz	Fastqsanger.gz
	SRR12819302.fastq.gz	Fastqsanger.gz
	SRR12819303.fastq.gz	Fastqsanger.gz
	SRR12819304.fastq.gz	Fastqsanger.gz

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Transcriptomic analysis of mouse preimplantation embryo development and nutrient provision

Project description:Purpose: The goals of this study are to define transcriptome (RNA-seq) of mouse preimplantation embryos at different stages of development under a range of different environmental conditions. Methods: Mouse preimplantation embro transcriptional profiles were generated using embryos at several different developmental stages using Smart-seq2. Results: RNA-seq analysis finds that there is a highly dynamic pattern of gene expression during the preimplantation period. The sensitiivty to nutrient conditions varies markedly at different stages of development, with 2C embryos more sensitive to pyruvate omission than later stage embryos. Conclusions: Our study represents a comprehensive analysis of the mouse preimplantation development transcriptome, and how pyruvate provision impacts different developmental stages.

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Project description:High resolution polysome fractionation and low-input ribosome profiling of bovine oocytes and preimplantation embryos has enabled us to define the translational landscape of early embryo development at an unprecedented level. We systematically and comparatively analyzed the transcriptome, polysome- and nonpolysome-bound RNA profiles of bovine oocytes and early embryos at 2-, 8-cell, morula, and blastocyst stage, and defined four modes of translational selectivity in bovine preimplantation embryo development: i. selective translation of non-abundant mRNAs, ii. active translating highly expressed mRNAs, iii. Translationally suppressed abundant mRNAs, and iv. Monosomaly occupied mRNAs. A strong selection towards genes involved in mitochondrial function and metabolic pathways was found throughout bovine preimplantation development. We found translatome largely follows transcriptome at oocytes, followed by a marked translational control at 8-cell embryos, which is gradually synchronized at the morula and blastocyst stage. We identified important novel cellular/embryonic functional regulators that being utilized and prioritized for translation at each developmental stage, that accompanies little-known bovine embryonic developmental programming. Together, these data reveal a unique spatiotemporal translational regulation that accompanies bovine preimplantation development.

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Project description:Studies using low-resolution methods to assess gene expression during preimplantation mouse development indicate that changes in gene expression either precede or occur concomitantly with the major morphological transitions, that is, conversion of the oocyte to totipotent 2-cell blastomeres, compaction, and blastocyst formation. Using microarrays, we characterized global changes in gene expression and used Expression Analysis Systematic Explorer (EASE) to identify biological and molecular processes that accompany and likely underlie these transitions. The analysis confirmed previously described processes or events, but more important, EASE revealed new insights. Response to DNA damage and DNA repair genes are overrepresented in the oocyte compared to 1-cell through blastocyst stages and may reflect the oocyte's response to selective pressures to insure genomic integrity; fertilization results in changes in the transcript profile in the 1-cell embryo that are far greater than previously recognized; and genome activation during 2-cell stage may not be as global and promiscuous as previously proposed, but rather far more selective, with genes involved in transcription and RNA processing being preferentially expressed. These results validate this hypothesis-generating approach by identifying genes involved in critical biological processes that can be the subject of a more traditional hypothesis-driven approach. Keywords: other

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Project description:The early stages of mammalian embryonic development involve the participation and cooperation of numerous complex processes, including nutritional, genetic, and epigenetic mechanisms. However, in embryos cultured in vitro, a developmental block occurs that affects embryo development and the efficiency of culture. Although the block period is reported to involve the transcriptional repression of maternal genes and transcriptional activation of zygotic genes, how epigenetic factors regulate developmental block is still unclear. In this study, we systematically analyzed whole-genome methylation levels during five stages of sheep oocyte and preimplantation embryo development using SC-WGBS technology. Then, we examined several million CpG sites in individual cells at each evaluated developmental stage to identify the methylation changes that take place during the development of sheep preimplantation embryos. Our results showed that two strong waves of methylation changes occurred, namely, demethylation at the 8- to 16-cell stage and methylation at the 16- to 32-cell stage. Analysis of DNA methylation patterns in different functional regions revealed a stable hypermethylation status in 3'UTRs and gene bodies; however, significant differences were observed in intergenic and promoter regions at different developmental stages. Changes in methylation at different stages of preimplantation embryo development were also compared to investigate the molecular mechanisms involved in sheep embryo development at the methylation level. In conclusion, we report a detailed analysis of the DNA methylation dynamics during the development of sheep preimplantation embryos. Our results provide an explanation for the complex regulatory mechanisms underlying the embryo developmental block based on changes in DNA methylation levels.

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