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Updated: Jun 5, 2025
Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal
Published on: May 30, 2012
DCP1A, a MEK substrate, regulates the self-renewal and differentiation of mouse embryonic stem cells
Jiayu Yu1, Nannan Zhao1, Yuying Wang1
1State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Protein Sciences, Frontiers Science Center for Cell Responses, National Demonstration Center for Experimental Biology Education and College of Life Sciences, Nankai University, Tianjin 300071, China.
Abstract:
Mitogen-activated extracellular signal-regulated kinase (MEK) inhibitors are widely applied to maintain pluripotency, while prolonged MEK inhibition compromises the developmental potential of mouse embryonic stem cells (ESCs). To understand the mechanism of MEK in pluripotency maintenance, we first demonstrated that MEK regulates gene expression at post-transcriptional steps. Consistently, many of the 66 MEK substrates identified by quantitative phosphoproteomics analysis are involved in RNA processing. We further confirmed that MEK1 phosphorylates S563 of DCP1A, an mRNA decapping cofactor and processing body (P body) component. DCP1A, as well as two other P body components, EDC4 and DCP2, are required for the self-renewal and differentiation of ESCs, indicating the role of P bodies in ESCs. Dephosphorylation of DCP1A S563 facilitates both self-renewal and differentiation of ESCs through promoting P body formation and RNA storage. In summary, our study identified 66 MEK substrates supporting the extracellular signal-regulated kinase (ERK)-independent function of MEK and revealed that DCP1A, phosphorylated by MEK, regulates ESC self-renewal and differentiation through modulating P body formation.
Insights
Mitogen-activated extracellular signal-regulated kinase (MEK) regulates gene expression post-transcriptionally. MEK phosphorylation of DCP1A controls RNA processing, impacting embryonic stem cell self-renewal and differentiation via processing bodies.
Area of Science:
- Stem cell biology
- Molecular and cellular biology
- Biochemistry
Background:
- Mitogen-activated extracellular signal-regulated kinase (MEK) inhibitors are crucial for maintaining pluripotency.
- Prolonged MEK inhibition can impair the developmental potential of mouse embryonic stem cells (ESCs).
Purpose of the Study:
- To elucidate the mechanism by which MEK maintains pluripotency in ESCs.
- To identify MEK substrates involved in post-transcriptional gene regulation.
Main Methods:
- Quantitative phosphoproteomics to identify MEK substrates.
- Western blotting and phosphorylation site analysis.
- Functional assays assessing ESC self-renewal and differentiation.
Main Results:
- Identified 66 MEK substrates, many involved in RNA processing.
- Demonstrated MEK1 phosphorylates DCP1A at S563, a key mRNA decapping cofactor.
- Showed DCP1A, EDC4, and DCP2 are essential for ESC self-renewal and differentiation, highlighting the role of processing bodies.
- Found dephosphorylation of DCP1A S563 promotes P body formation and RNA storage, facilitating ESC self-renewal and differentiation.
Conclusions:
- MEK regulates ESC pluripotency through post-transcriptional gene expression.
- DCP1A, phosphorylated by MEK, plays a critical role in ESC self-renewal and differentiation by modulating processing body formation and RNA storage.
- Identified an extracellular signal-regulated kinase (ERK)-independent function of MEK in regulating ESC fate via RNA processing.
