Related Experiment Video
Updated: May 9, 2025
07:23
Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification
Published on: December 3, 2016
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METTL14 regulates chondrogenesis through the GDF5-RUNX-extracellular matrix gene axis during limb development
Nobuko Katoku-Kikyo1,2, Hiroko Kawakami1,2, Max Cantor1,2
1Stem Cell Institute, University of Minnesota, Minneapolis, MN, USA.
Nature Communications
|April 30, 2025
Summary
N-methyladenosine (m6A) RNA methylation is crucial for chondrogenesis and limb development. This study reveals an m6A-driven cascade regulating cartilage formation and skeletal patterning.
Area of Science:
- Developmental Biology
- Epigenetics
- Molecular Biology
Background:
- N-methyladenosine (m6A) RNA methylation is vital for mammalian development.
- The specific roles of m6A in chondrogenesis, the process of cartilage formation, are not well understood.
- Understanding these roles is key to deciphering skeletal development mechanisms.
Purpose of the Study:
- To investigate the necessity of m6A RNA methylation in chondrogenesis and limb morphogenesis.
- To identify the molecular pathways regulated by m6A during skeletal development.
- To elucidate the function of Mettl14 in the context of limb development.
Main Methods:
- Generation of limb progenitor-specific knockout mice lacking Mettl14, a key component of the m6A methyltransferase complex.
- Analysis of limb bud morphology and cartilage anlagen formation in knockout and wild-type mice.
- Proteomic analysis to identify differentially expressed proteins and gene expression profiling.
Main Results:
- Mettl14 knockout disrupted cartilage formation and resulted in shortened limb skeletons.
- Eleven downregulated proteins, implicated in chondrogenesis, were identified.
- m6A was found to stabilize transcripts and increase protein levels of GDF5, Runx2, and Runx3, key regulators of chondrogenesis.
- These factors subsequently promoted the expression of collagen genes and other chondrogenic factors.
Conclusions:
- m6A RNA methylation is essential for chondrogenesis and limb skeletal development.
- A novel m6A-dependent gene regulatory cascade involving GDF5, Runx2/3, and downstream targets controls chondrogenesis.
- This study uncovers a critical epigenetic mechanism underlying skeletal patterning.
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