Language：English   Publishing type：Research paper (scientific journal)  

<jats:title>ABSTRACT</jats:title><jats:p>Preimplantation embryonic development is orchestrated by dynamic changes in the proteome and transcriptome, regulated by mechanisms such as maternal‐to‐zygotic transition. Here, we employed label‐free quantitative proteomics to comprehensively analyze proteome dynamics from germinal vesicle oocytes to blastocysts in mouse embryos. We identified 3490 proteins, including 715 consistently detected across all stages, revealing stage‐specific changes in proteins associated with translation, protein modification, and mitochondrial metabolism. Comparison with transcriptomic data highlighted a low correlation between mRNA and protein levels, underscoring the significance of non‐transcriptional regulatory mechanisms during early development. Additionally, we analyzed WD repeat‐containing protein 74 (WDR74)‐deficient embryos generated using CRISPR‐Cas9 genome editing. WDR74, a pre‐60S ribosome maturation factor, was found to be critical for ribosome biogenesis and cell division. Furthermore, WDR74 deficiency led to a significant reduction in ribosomal protein large subunit and impaired progression beyond the morula stage. Key ribosomal proteins such as ribosomal protein L24 (RPL24) and ribosomal protein L26 (RPL26), which influence cell division timing, were notably affected, while small subunit proteins remained largely unchanged. Taken together, our study demonstrates the utility of integrating genome editing with proteomic analysis to elucidate molecular mechanisms underlying early embryogenesis, and provides new insights into protein‐level regulation of preimplantation development.</jats:p>

DOI： 10.1111/gtc.70001

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Language：English   Publishing type：Research paper (scientific journal)  

<jats:title>Abstract</jats:title><jats:p>In multicellular organisms, oocytes and sperm undergo fusion during fertilization and the resulting zygote gives rise to a new individual. The ability of zygotes to produce a fully formed individual from a single cell when placed in a supportive environment is known as totipotency. Given that totipotent cells are the source of all multicellular organisms, a better understanding of totipotency may have a wide-ranging impact on biology. The precise delineation of totipotent cells in mammals has remained elusive, however, although zygotes and single blastomeres of embryos at the two-cell stage have been thought to be the only totipotent cells in mice. We now show that a single blastomere of two- or four-cell mouse embryos can give rise to a fertile adult when placed in a uterus, even though blastomere isolation disturbs the transcriptome of derived embryos. Single blastomeres isolated from embryos at the eight-cell or morula stages and cultured in vitro manifested pronounced defects in the formation of epiblast and primitive endoderm by the inner cell mass and in the development of blastocysts, respectively. Our results thus indicate that totipotency of mouse zygotes extends to single blastomeres of embryos at the four-cell stage.</jats:p>

DOI： 10.1038/s41598-021-90653-1

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Presentation type：Oral presentation (general)  

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Presentation type：Oral presentation (general)  

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Presentation type：Poster presentation  

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Presentation type：Poster presentation  

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Presentation type：Poster presentation  

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