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Super-Enhancer-Mediated DLX5 Activation Defines Regulatory Mechanisms in Human Embryonic Stem Cell-Derived
Shinse Fujita1,2, Shoichiro Tani3, Hiroyuki Okada1,2
1Division of Clinical Biotechnology, Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
Development, Growth & Differentiation
|September 3, 2025
Summary
Human embryonic stem cell-derived osteoblasts offer insights into skeletal development. A study highlights DLX5, a key regulator, driven by a super-enhancer, crucial for bone formation.
Area of Science:
- Developmental Biology
- Stem Cell Biology
- Genomics
Background:
- Osteoblast differentiation is vital for skeletal development and homeostasis.
- Human embryonic stem cells (hESCs) provide a model for studying human skeletal development, unlike bone marrow-derived mesenchymal stem/stromal cells (BM-MSCs).
Purpose of the Study:
- To investigate the regulatory mechanisms of osteoblast differentiation in a human developmental context.
- To compare gene expression and chromatin accessibility between hESC-derived and BM-MSC-derived osteoblasts.
Main Methods:
- Assay for Transposase-Accessible Chromatin sequencing (ATAC-seq) and RNA sequencing (RNA-seq) were performed on osteoblasts derived from induced sclerotome of Col2.3-GFP reporter hESCs.
- Comparative analysis was conducted with BM-MSC-derived osteoblasts.
Main Results:
- Skeletal development-associated chromatin accessibility and transcriptional profiles were identified in hESC-derived osteoblasts.
- hESC-derived osteoblasts showed enrichment for regulatory gene sets linked to ossification compared to BM-MSC-derived osteoblasts.
- A super-enhancer regulating DLX5, a known osteoblast regulator, was identified, comprising multiple cooperative enhancer elements.
Conclusions:
- This study provides a valuable resource for understanding cis-trans regulatory mechanisms in human skeletal development.
- DLX5 is a key transcriptional regulator in osteoblast differentiation, controlled by an osteoblast super-enhancer.
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