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- W2078487972 abstract "After fertilization, the maternal proteins stored in oocytes are degraded and new proteins encoded by the zygotic genome are synthesized. Although several proteins are degraded by the ubiquitin-proteasome system, the mechanism underlying the dynamic protein turnover during this process remains largely unknown. We recently reported that autophagy plays a critical role during preimplantation embryonic development. We found that the level of autophagy was low in unfertilized oocytes; however, autophagy was activated shortly after fertilization. The function of autophagy was further analyzed using oocyte-specific Atg5 (autophagy-related 5) knockout mice. Atg5-null oocytes could develop if they were fertilized with wild-type sperm, but could not develop beyond the four- and eight-cell stages if they were fertilized with Atg5-null sperm. Furthermore, protein synthesis rates were reduced in the autophagy-deficient embryos. We have previously reported that Atg5-null oocytes derived from Atg5(+/-) mice, which should contain maternally inherited Atg5 protein in the oocyte, were able to produce Atg5(-/-) neonates, emphasizing the specific importance of autophagy during very early embryogenesis. Thus, the degradation of maternal factors by autophagy is essential for preimplantation development in mammals." @default.
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- W2078487972 date "2008-11-16" @default.
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- W2078487972 title "The role of autophagy during the oocyte-to-embryo transition" @default.
- W2078487972 doi "https://doi.org/10.4161/auto.7065" @default.
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