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p63 is the molecular switch for initiation of an epithelial stratification program
Maranke I Koster1, Soeun Kim, Alea A Mills
1Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030, USA.
Genes & Development
|January 20, 2004
Summary
p63 isoforms initiate epithelial stratification during development and maintain keratinocyte proliferation in mature epidermis. TAp63 isoforms start stratification, while DeltaNp63 isoforms allow epidermal maturation.
Area of Science:
- Developmental Biology
- Molecular Biology
- Cell Biology
Background:
- Stratified epithelia, like the epidermis, depend on p63 gene expression for proper development.
- The p63 gene produces distinct protein isoforms: TAp63 (with a transactivation domain) and DeltaNp63 (lacking it).
Purpose of the Study:
- To investigate the specific roles of p63 isoforms in embryonic epithelial development and epidermal maturation.
- To elucidate the dual function of p63 in initiating stratification and maintaining epidermal homeostasis.
Main Methods:
- Analysis of p63 isoform expression patterns during embryogenesis.
- Functional studies to determine the requirement of TAp63 for epithelial stratification.
- Investigation of the interplay between TAp63 and DeltaNp63 in regulating keratinocyte differentiation.
Main Results:
- TAp63 isoforms are the earliest expressed p63 variants and are essential for initiating epithelial stratification.
- TAp63 isoforms suppress terminal differentiation, indicating a need for DeltaNp63 to permit epidermal maturation.
- p63 exhibits a dual role: driving stratification in development and sustaining basal keratinocyte proliferation in adult epidermis.
Conclusions:
- p63 isoforms orchestrate key events in epidermal development, from initial stratification to mature tissue maintenance.
- The balance between TAp63 and DeltaNp63 isoforms is critical for regulating the transition from proliferation to differentiation in the epidermis.