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Updated: Jul 4, 2025

A Simple Method to Identify Kinases That Regulate Embryonic Stem Cell Pluripotency by High-throughput Inhibitor Screening
Published on: May 12, 2017
PRAMEL7 and CUL2 decrease NuRD stability to establish ground-state pluripotency
Meneka Rupasinghe1,2, Cristiana Bersaglieri1, Deena M Leslie Pedrioli1
1Department of Molecular Mechanisms of Disease, DMMD, University of Zurich, 8057, Zurich, Switzerland.
PRAMEL7 reprograms advanced stem cells to a ground state by interacting with Cullin2 (CUL2). This interaction targets repressive chromatin regulators for degradation, restoring pluripotency gene expression.
Area of Science:
- Stem cell biology
- Epigenetics
- Molecular mechanisms of pluripotency
Background:
- Pluripotency is established early in embryonic development.
- Embryonic stem cells (ESCs) capture pluripotency but differ from the developmental ground state.
- PRAMEL7 protein is key to achieving ground-state pluripotency.
Purpose of the Study:
- To elucidate the mechanism by which PRAMEL7 reprograms gene expression.
- To investigate the role of PRAMEL7-Cullin2 (CUL2) interaction in establishing ground-state pluripotency.
Main Methods:
- Investigated PRAMEL7 association with Cullin2 (CUL2).
- Assessed PRAMEL7-CUL2 complex recruitment to chromatin.
- Analyzed proteasomal degradation of chromatin regulators, including the NuRD complex.
Main Results:
- PRAMEL7 directly associates with CUL2, which is essential for ground-state gene expression.
- The PRAMEL7-CUL2 complex targets NuRD for proteasomal degradation.
- PRAMEL7 antagonizes NuRD-mediated repression, enhancing pluripotency gene expression via CUL2-dependent mechanisms.
Conclusions:
- PRAMEL7-CUL2 interaction drives ground-state pluripotency by degrading NuRD.
- This study links proteasomal degradation pathways to ground-state gene expression.
- Findings offer insights for creating improved in vitro models of ground-state pluripotency.
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