Distinct activities of the anaphase-promoting complex/cyclosome (APC/C) in mouse embryonic cells.

Cell Cycle
Valerie S YangMichael A Gonzalez

Abstract

The first differentiation event in mammalian development gives rise to the blastocyst, consisting of two cell lineages that have also segregated in how the cell cycle is structured. Pluripotent cells of the inner cell mass divide mitotically to retain a diploid DNA content, but the outer trophoblast cells can amplify their genomes more than 500-fold by undergoing multiple rounds of DNA replication, completely bypassing mitosis. Central to this striking divergence in cell cycle control is the E3 ubiquitin-ligase activity of the anaphase-promoting complex or cyclosome (APC/C). Extended suppression of APC/C activity during interphase of mouse pluripotent cells promotes rapid cell cycle progression by allowing stabilization of cyclins, whereas unopposed APC/C activity during S phase of mouse trophoblast cells triggers proteasomal-mediated degradation of geminin and giant cell formation. While differential APC/C activity might govern the atypical cell cycles observed in pre-implantation mouse embryos, geminin is a critical APC/C substrate that: (1) escapes degradation in pluripotent cells to maintain expression of Oct4, Sox2 and Nanog; and (2) mediates specification and endoreduplication when targeted for ectopic destruction in trop...Continue Reading

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Jul 31, 2013·The EMBO Journal·Eva HörmansederThomas U Mayer
Sep 9, 2015·International Journal of Reproductive Medicine·Jennifer A TolenPhilip J Chan
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May 30, 2020·Reproduction in Domestic Animals = Zuchthygiene·Tatiana G Zybina, Eugenia V Zybina

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Cell cycle checkpoints are a series of complex checkpoint mechanisms that detect DNA abnormalities and ensure that DNA replication and repair are complete before cell division. They are primarily regulated by cyclins, cyclin-dependent kinases, and the anaphase-promoting complex/cyclosome. Here is the latest research.