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Updated: Dec 20, 2025

Isolation of Whole Cell Protein Lysates from Mouse Facial Processes and Cultured Palatal Mesenchyme Cells for Phosphoprotein Analysis
Published on: April 1, 2022
GCN5 acetylation is required for craniofacial chondrocyte maturation
Sofia A Pezoa1, Kristin B Artinger2, Lee A Niswander3
1Cell Biology, Stem Cells, and Developmental Biology Graduate Program. University of Colorado Anschutz School of Medicine, Aurora, CO, USA, 80045; Department of Molecular, Cellular, and Developmental Biology. University of Colorado Boulder, Boulder, CO, USA, 80309.
The enzyme GCN5 (also known as KAT2A) is crucial for craniofacial chondrocyte development. It acts as a non-histone acetyltransferase, regulating chondrocyte maturation and mTORC1 pathway activation.
Area of Science:
- Cellular and Molecular Biology
- Developmental Biology
- Epigenetics
Background:
- Craniofacial development depends on cranial neural crest cell differentiation.
- The acetyltransferase GCN5 (KAT2A) is essential for murine craniofacial development.
- GCN5's role in chondrocyte development requires further elucidation.
Purpose of the Study:
- To investigate the role of GCN5 in craniofacial chondrocyte development.
- To determine if GCN5 acts as an epigenetic or non-epigenetic regulator.
- To explore GCN5's involvement in the mTORC1 pathway.
Main Methods:
- In vivo and in vitro inhibition of GCN5 acetyltransferase activity.
- Analysis of chondrocyte maturation and size.
- Investigation of GCN5 acetylation's contribution to mTORC1 pathway activity.
Main Results:
- GCN5 is required cell autonomously in cranial neural crest cells for chondrocyte development.
- GCN5 promotes chondrocyte maturation and size increase.
- GCN5 functions primarily as a non-histone acetyltransferase, not an epigenetic regulator of H3K9 acetylation.
- GCN5 acetylation is necessary for mTORC1 pathway activation, potentially via RAPTOR acetylation.
Conclusions:
- GCN5 is a key regulator of chondrocyte maturation and craniofacial development.
- GCN5's non-histone acetyltransferase activity is critical for chondrocyte development.
- GCN5 acetylation influences mTORC1 pathway signaling, impacting chondrocyte function.
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