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SOX9: A genomic view of tissue specific expression and action
Aleisha Symon1, Vincent Harley1
1Molecular Genetics and Development Laboratory, Hudson Institute of Medical Research, Melbourne, Australia; Department of Anatomy and Developmental Biology, Monash University, Melbourne, Australia.
The International Journal of Biochemistry & Cell Biology
|March 22, 2017
Summary
The SOX9 transcription factor regulates cell differentiation through complex gene regulation. Specific enhancers control SOX9 expression, and mutations in these regions cause developmental disorders like Campomelic Dysplasia.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- SOX9 is a crucial transcription factor regulating cell differentiation across vertebrates.
- The SOX9 gene locus is extensive and harbors numerous tissue-specific regulatory elements called enhancers.
- Dysregulation of SOX9, through mutations in coding or enhancer regions, is linked to Campomelic Dysplasia and related syndromes.
Purpose of the Study:
- To elucidate the regulatory mechanisms governing SOX9 gene expression.
- To understand how tissue-specific enhancers direct SOX9 activity.
- To correlate SOX9 mutations with specific clinical phenotypes.
Main Methods:
- Chromatin Immunoprecipitation (ChIP) was employed to map SOX9 binding sites genome-wide.
- Analysis of SOX9 binding in various cell types, including chondrocytes and hair follicle stem cells.
- Investigation of SOX9's role in controlling target gene expression.
Main Results:
- SOX9 binds to super-enhancers in chondrocytes and hair follicle stem cells.
- SOX9 binding near promoters influences basal cellular activity.
- Distal enhancers are critical for conferring cell type-specific SOX9 expression patterns.
- Mutations in coding regions versus enhancer regions lead to distinct clinical outcomes.
Conclusions:
- SOX9's complex regulatory network involves both proximal and distal elements.
- Tissue-specific enhancers are key determinants of SOX9 function in development.
- Understanding SOX9 regulation is vital for diagnosing and potentially treating SOX9-related disorders.
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