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Blastocyst Formation

ABSTRACT: In this study we aimed to examine the effect of alternative in vivo and in vitro culture conditions during the time of blastocyst formation on the transcriptome profile of bovine blastocysts.

ORGANISM(S): Bos taurus

PROVIDER: GSE49391 | GEO | 2014/01/30

SECONDARY ACCESSION(S): PRJNA213878

REPOSITORIES: GEO

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Blastocyst Formation

Project description:In this study we aimed to examine the effect of alternative in vivo and in vitro culture conditions during the time of blastocyst formation on the transcriptome profile of bovine blastocysts. Two different blastocyst groups were produced. The first group (Vitro_morula) was matured, fertilized and cultured in vitro until morula stage then transferred to synchronized recipients and blastocysts were collected at day 7 by uterine flushing. The second group (Vivo_morula) was matured, fertilized and cultured in vivo until morula stage then flushed out and cultured in vitro until day 7. Complete in vitro (IVP) and in vivo blastocysts were produced and used as controls.

2014-01-30 | E-GEOD-49391 | biostudies-arrayexpress

Gene expression analysis of bovine blastocyst produced under alternative in vivo and in vitro culture conditions during EGA time

Project description:There is an inevitable need for combining in vitro and in vivo culture systems during specific developmental time points to facilitate a comprehensive understanding of early embryo development which would yield insights into the molecular pathways controlling early development and to improve our knowledge in regulation of embryonic development. In current study, we aimed to understand the influences of alternative culture conditions (in vivo or in vitro) during EGA event on embryonic developmental rate, gene expression pattern and subsequent influences on pathways and biological functions controlling bovine embryo development. Six different blastocyst groups were produced under alternative in vivo and in vitro culture conditions. The first two groups (Vitro_4-cell and Vitro_16-cell) were matured, fertilized and cultured in vitro until 4- and 16-cell stage, respectively then transferred to synchronized recipients and continued culture in vivo until day 7 blastocyst stage. The second two groups (Vivo_4-cell and Vivo_16-cell) were matured, fertilized and cultured in vivo until 4- and 16-cell stage, respectively then flushed out and cultured in vitro until day 7 blastocyst stage. Complete in vitro (IVP) and in vivo (control group) blastocysts were also produced. Samples from the three pools (biological replicates) of each blastocyst group and in vivo control blastocyst were hybridized on EmbryoGENE’s bovine microarray using a dye-swap design (technical replicates) for a total of six arrays.

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Project description:Understanding blastocyst formation and implantation is critical for improving farm animal reproduction but is hampered by a limited supply of embryos. We developed an efficient method to generate bovine blastocyst-like structures (termed blastoids) via the assembly of trophoblast stem cells and expanded potential stem cells. Bovine blastoids resemble blastocysts in morphology, cell composition, single-cell transcriptomes, and represent an accessible in vitro model for studying bovine embryogenesis.

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Project description:In order to understand how in vitro culture affects embryonic quality, we analyzed survival and global gene expression in bovine blastocysts after exposure to increased oxidative stress conditions of IVC. A pro-oxidant agents that act extra-cellularly by promoting ROS production (0.01 mM 2,2'-azobis (2-amidinopropane) dihydrochloride [AAPH]) was added from days 3 to 7, and transcriptomic analysis was then performed in resulting blastocysts. Precisely, after in vitro maturation and fertilization, bovine zygotes were culture in vitro in normal condition, then at day 3, embryos were allocated into culture in control or supplemented with AAPH (0.01 mM) until day 7. At this time, blastocysts were harvested and analyzed. Our hypothesis was that AAPH treatment will affect blastocyst survival and gene expression associated with low embryo quality

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