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Updated: Jan 25, 2026

Epigenetic Regulation of Cardiac Differentiation of Embryonic Stem Cells and Tissues
Published on: June 3, 2016
UHRF genes regulate programmed interdigital tissue regression and chondrogenesis in the embryonic limb
Cristina Sanchez-Fernandez1, Carlos I Lorda-Diez1, Juan A García-Porrero1
1Departamento de Anatomía y Biología Celular and IDIVAL, Universidad de Cantabria, 39011, Santander, Spain.
Epigenetic regulators Uhrf1 and Uhrf2 control embryonic limb development by promoting cell senescence and apoptosis. These genes fine-tune the balance between cell stemness and differentiation, crucial for programmed cell death during digit formation.
Area of Science:
- Developmental Biology
- Epigenetics
- Cell Biology
Background:
- Limb development involves extensive programmed cell death (PCD) for digit formation and joint patterning.
- Cell senescence and apoptosis are key mechanisms driving embryonic remodeling in the developing limb autopod.
- The upstream regulators of PCD during limb development remain incompletely understood.
Purpose of the Study:
- To investigate the role of epigenetic regulators Uhrf1 and Uhrf2 in embryonic limb development and programmed cell death.
- To elucidate the molecular mechanisms by which Uhrf1 and Uhrf2 influence chondrogenesis, cell senescence, and apoptosis.
Main Methods:
- Spatial and temporal expression analysis of Uhrf1 and Uhrf2 in embryonic limb primordia.
- In vitro functional studies using limb skeletal progenitor cultures with Uhrf1/Uhrf2 overexpression.
- Analysis of DNA methylation, chondrogenesis markers (Sox9, Scleraxis), apoptosis (Bak1), senescence (p21), and cell cycle progression.
- In vivo modulation by FGF signaling and micromass culture assays.
Main Results:
- Uhrf1 and Uhrf2 are expressed in pre-apoptotic regions of the developing limb, localizing to methylated DNA foci.
- Overexpression of Uhrf1/Uhrf2 in progenitors inhibits chondrogenesis, induces senescence and apoptosis, and alters DNA methylation.
- Uhrfs modulate differentiation factors, upregulate pro-apoptotic gene Bak1, induce senescence via p21, and arrest cells in S phase.
- FGF signaling positively regulates Uhrf gene expression in vivo; Uhrf1 is downregulated during chondrogenic differentiation.
Conclusions:
- Uhrf1 and Uhrf2 are critical upstream regulators of PCD during embryonic limb development.
- Epigenetic modifications orchestrated by Uhrfs are essential for balancing cell stemness and differentiation, initiating programmed cell death.
- Chromatin organization via epigenetic modifications is a precocious and critical factor in regulating embryonic cell death during limb morphogenesis.
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