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Tissue Preparation and Immunostaining of Mouse Craniofacial Tissues and Undecalcified Bone
Published on: May 10, 2019
Osteoblast differentiation profiles define sex specific gene expression patterns in craniosynostosis.
Sarah S Park1, Richard P Beyer2, Matthew D Smyth3
1Seattle Children's Research Institute, Center for Developmental Biology and Regenerative Medicine, Seattle, WA, USA.
Single suture craniosynostosis (SSC) involves premature fusion of skull sutures. This study found osteoblast dysfunction in SSC, with sex-specific gene expression patterns contributing to the condition.
Area of Science:
- Craniofacial Surgery
- Developmental Biology
- Genetics
Background:
- Single suture craniosynostosis (SSC) affects 1 in 1700-2500 live births.
- Sagittal and metopic synostosis show male predominance, while coronal synostosis shows female predominance.
- The exact causes of most SSC cases remain unknown.
Purpose of the Study:
- To investigate osteoblast differentiation and proliferation in single suture craniosynostosis.
- To explore potential genetic factors contributing to sex-specific differences in SSC.
Main Methods:
- Established and analyzed 227 primary calvarial osteoblast cell lines from SSC patients and controls.
- Assayed alkaline phosphatase (ALP) activity and BrdU incorporation to measure osteoblast differentiation and proliferation.
- Performed correlation analyses between cellular activity and global gene expression, stratified by sex.
Main Results:
- Osteoblasts from sagittal synostosis patients showed higher ALP activity and reduced proliferation compared to controls.
- Sex-stratified analysis revealed higher ALP activity in males and females with sagittal synostosis and males with metopic synostosis.
- Males with sagittal or metopic synostosis exhibited reduced proliferation.
- Gene expression analysis identified differentially regulated transcripts related to osteoblast differentiation with significant sex-specific patterns.
Conclusions:
- Dysregulation of osteoblast differentiation is implicated in the development of single suture craniosynostosis.
- Genetic factors likely contribute to the observed sex-related differences in SSC.
- Further research into sex-specific gene expression patterns may reveal novel therapeutic targets.
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