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Updated: Feb 3, 2026
10:27
Functional Characterization of RING-Type E3 Ubiquitin Ligases In Vitro and In Planta
Published on: December 5, 2019
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Ubiquitin ligase COP1 coordinates transcriptional programs that control cell type specification in the developing
Kim Newton1, Debra L Dugger2, Arundhati Sengupta-Ghosh3
1Department of Physiological Chemistry, Genentech, South San Francisco, CA 94080; knewton@gene.com dixit@gene.com.
Summary
The E3 ubiquitin ligase CRL4COP1/DET1 regulates neural development by degrading transcription factors ETV5 and c-JUN. Loss of COP1 in neural stem cells causes accumulation of these factors, leading to developmental defects and perinatal lethality.
Area of Science:
- Neuroscience
- Molecular Biology
- Developmental Biology
Background:
- The E3 ubiquitin ligase CRL4COP1/DET1 targets transcription factors for degradation.
- ERK signaling pathway regulates CRL4COP1/DET1 activity.
- ETV1, ETV4, ETV5, and c-JUN are key transcription factors involved in cellular processes.
Purpose of the Study:
- To investigate the role of CRL4COP1/DET1 in neuronal regulation.
- To determine the impact of ERK signaling on ETV5 and c-JUN stability in neurons.
- To analyze the consequences of COP1 deletion in neural stem cells on brain development and viability.
Main Methods:
- Western blotting to detect protein accumulation.
- Immunohistochemistry to analyze gene expression patterns.
- CRISPR-Cas9 gene editing to generate COP1-deficient mice.
- Phenotypic analysis of developing brains and survival rates.
Main Results:
- ERK activation leads to rapid accumulation of ETV5 and c-JUN in neurons.
- Deletion of COP1 in neural stem cells results in elevated ETV1, ETV4, ETV5, and c-JUN.
- COP1 deficiency causes increased expression of gliogenesis markers and subtle brain abnormalities.
- COP1-deficient mice exhibit perinatal lethality, which is rescued by concurrent deletion of c-Jun and Etv5, or Etv1.
Conclusions:
- CRL4COP1/DET1 plays a critical role in neuronal development by controlling ETV5 and c-JUN stability.
- Dysregulation of this pathway due to COP1 loss leads to severe developmental defects and lethality.
- Targeting ETV5 and c-JUN may offer therapeutic strategies for developmental disorders.
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