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Runx2 regulates chromatin accessibility to direct the osteoblast program at neonatal stages
Hironori Hojo1, Taku Saito2, Xinjun He3
1Laboratory of Clinical Biotechnology, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan; Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8655, Japan.
Cell Reports
|September 7, 2022
Summary
The transcriptional regulator Runx2 (runt-related transcription factor 2) plays distinct roles in bone and cartilage development. This study reveals how Runx2 controls cell-specific gene regulation and chromatin accessibility in osteoblasts.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- The transcription factor Runx2 (runt-related transcription factor 2) is crucial for skeletal development, with distinct functions in osteoblasts and chondrocytes.
- Mechanisms by which Runx2 orchestrates these cell-type-specific roles remain unclear.
Purpose of the Study:
- To investigate the cell-type-specific regulatory mechanisms of Runx2 in osteoblasts and chondrocytes.
- To understand how Runx2 influences DNA binding and chromatin accessibility in these distinct cell types.
Main Methods:
- Integrative analysis of Runx2-DNA binding and chromatin accessibility ex vivo in neonatal osteoblasts and chondrocytes.
- Genetic analysis and cellular reprogramming studies.
- Functional enhancer assays.
Main Results:
- Runx2 interacts with distinct accessible chromatin regions in a cell-type-specific manner.
- Runx2 binding creates cell-type-specific regulatory hotspots and enhances chromatin accessibility.
- Runx2 is essential for establishing chromatin accessibility in osteoblasts.
- An Sp7 distal enhancer, regulated by Runx2 and chromatin accessibility, is vital for osteoblast differentiation.
Conclusions:
- Runx2 establishes cell-type-specific regulatory landscapes by modulating chromatin accessibility and enhancer activity.
- These findings elucidate Runx2-mediated enhancer networks critical for osteoblast specification.
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