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Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal
Published on: May 30, 2012
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Heterogeneity in Oct4 and Sox2 Targets Biases Cell Fate in 4-Cell Mouse Embryos
Mubeen Goolam1, Antonio Scialdone2, Sarah J L Graham1
1Department of Physiology, Development & Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK.
Cell
|March 26, 2016
Summary
Early heterogeneous gene expression in mouse embryos, particularly involving Sox21, initiates cell-fate decisions. This process balances pluripotency and differentiation, crucial for development.
Area of Science:
- Developmental Biology
- Genetics
- Epigenetics
Background:
- Pre-implantation development is critical for establishing embryonic and extra-embryonic cell fates in mammals.
- Understanding the initiation of cell-fate decisions during early development is essential.
Purpose of the Study:
- To investigate the timing and mechanisms of cell-fate determination during mouse pre-implantation development.
- To characterize the role of gene expression heterogeneity in initiating these decisions.
Main Methods:
- Single-cell transcriptome analysis of all cells throughout mouse pre-implantation development.
- Live-cell tracking to monitor cell lineage and progeny.
- Gene expression analysis of pluripotency regulators (Oct4, Sox2) and differentiation markers (Cdx2).
- Investigation of epigenetic regulation involving histone H3R26-methylase CARM1.
Main Results:
- Heterogeneous expression of pluripotency regulators Oct4 and Sox2 was observed as early as the 4-cell stage.
- Sox21 showed highly heterogeneous expression, with decreased levels leading to more extra-embryonic progeny.
- Reduced Sox21 expression resulted in premature upregulation of the differentiation regulator Cdx2.
- Sox21 expression levels were modulated by the histone H3R26-methylase CARM1, indicating epigenetic influence.
Conclusions:
- Heterogeneous gene expression, initiated by the 4-cell stage, plays a fundamental role in cell-fate decisions during mammalian pre-implantation development.
- Sox21 acts as a safeguard for pluripotency, and its regulation by CARM1 highlights the importance of epigenetic mechanisms.
- Modulating the balance between pluripotency and differentiation through early gene expression heterogeneity is key to establishing distinct cell lineages.
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