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Impaired ossification in mice lacking the transcription factor Sp3
H Göllner1, C Dani, B Phillips
1Institut für Molekularbiologie und Tumorforschung, Emil-Mannkopff-Strasse 2, 35037, Marburg, Germany.
Mechanisms of Development
|July 27, 2001
Summary
Sp3 transcription factor is crucial for skeletal development. Sp3 null mice exhibit impaired bone formation and reduced osteocalcin expression, highlighting its essential role in ossification.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Sp3 is a ubiquitously expressed transcription factor belonging to the Sp family.
- Sp3 plays a role in various developmental processes, including tooth formation.
Purpose of the Study:
- To investigate the role of Sp3 in skeletal ossification.
- To determine the impact of Sp3 deficiency on bone development.
Main Methods:
- Homologous recombination was used to create Sp3 null mice (Sp3-/-).
- Skeletal ossification was assessed in E18.5 Sp3-/- embryos.
- In vitro differentiation studies were performed using Sp3-/- embryonic stem (ES) cells.
- Expression of osteoblast-specific markers, including osteocalcin and Cbfa1, was analyzed.
Main Results:
- Sp3 null mice die at birth due to respiratory failure and display defects in late tooth formation.
- Both endochondral and intramembranous ossification are impaired in Sp3-/- embryos.
- Reduced expression of osteocalcin was observed in Sp3-/- embryos and ES cells.
- Core binding factor 1 (Cbfa1) expression remained normal in Sp3-deficient models.
Conclusions:
- Sp3 is essential for proper skeletal ossification, impacting both endochondral and intramembranous bone formation.
- Sp3 deficiency leads to reduced osteocalcin expression, indicating a role in osteoblast differentiation.
- These findings establish Sp3 as a critical transcription factor for late bone development.