Related Experiment Video
Updated: Oct 1, 2025
08:42
Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
Published on: July 3, 2020
4.6K
DNMT1 is a negative regulator of osteogenesis
1State Key Laboratory of Organ Failure Research, Department of Cell Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, China.
Biology Open
|March 3, 2022
Summary
DNA methyltransferase 1 (DNMT1) is overexpressed in osteoporosis and suppresses bone formation by inhibiting osteoblast differentiation. Inhibiting DNMT1 promotes bone growth, offering a potential therapy for age-related bone loss.
Area of Science:
- Molecular Biology
- Epigenetics
- Bone Biology
Background:
- The mechanisms of DNA methylation in bone formation are not well understood.
- Osteoporosis is associated with aging and bone loss.
Purpose of the Study:
- To investigate the role of DNA methyltransferase 1 (DNMT1) in osteogenesis and chondrogenesis.
- To explore DNMT1 as a potential therapeutic target for age-related bone loss.
Main Methods:
- Overexpression analysis of DNMT1 in human and mouse bone samples.
- Mesenchymal stem cell (MSC) differentiation assays with DNMT1 depletion.
- Demethylation analysis at osteogenic gene promoters (RORA, Fgfr2).
- Gene silencing experiments to assess downstream effects.
Main Results:
- DNMT1 is overexpressed in senile osteoporosis and suppresses osteoblast differentiation.
- DNMT1 depletion leads to demethylation and upregulation of RORA and Fgfr2.
- DNMT1 directly binds to and methylates the promoters of RORA and Fgfr2.
- Silencing RORA or Fgfr2 counteracts the effects of DNMT1 depletion on osteoblast differentiation.
Conclusions:
- DNMT1 acts as a key repressor of osteoblast differentiation and bone formation.
- DNMT1 inhibition is a potential therapeutic strategy for age-related bone loss.
Related Concept Videos
02:23Master Transcription Regulators
7.2K
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
7.2K
02:23Abnormal Proliferation
4.7K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.7K
01:23Negative Regulator Molecules
36.3K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
36.3K
03:14Notch Signaling Pathway
4.5K
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not...
4.5K
01:31Osteoclasts in Bone Remodeling
3.3K
Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
3.3K
01:13Formation of Muscle Fibers from Myoblasts
5.3K
De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription...
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription...
5.3K