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Updated: Aug 9, 2026
07:29
Characterization of In Vitro Differentiation of Human Primary Keratinocytes by RNA-Seq Analysis
Published on: May 16, 2020
Differential roles of p63 isoforms in epidermal development: selective genetic complementation in p63 null mice
E Candi1, A Rufini, A Terrinoni
1Biochemistry Laboratory, IDI-IRCCS, c/o University of Rome Tor Vergata, 00133 Rome, Italy.
Cell Death and Differentiation
|April 8, 2006
Summary
The transcription factor p63 is crucial for skin development. Its two protein forms, TAp63 and deltaNp63, play distinct cooperative roles in epidermal formation and differentiation.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- The transcription factor p63 is essential for epidermal development, with p63-/- mice lacking skin.
- p63 encodes two protein isoforms: TAp63 (with a transactivation domain) and deltaNp63 (without).
- The distinct roles of TAp63 and deltaNp63 in epidermal development are not well understood.
Purpose of the Study:
- To investigate the specific contributions of TAp63 and deltaNp63 isoforms to epidermal development.
- To elucidate the molecular mechanisms by which these isoforms regulate skin formation.
Main Methods:
- In vivo genetic complementation using p63-/- mice.
- Reintroduction of TAp63alpha and/or deltaNp63alpha under the K5 promoter.
- Analysis of epidermal differentiation, ultrastructure, and gene expression.
Main Results:
- p63-/- mice and those complemented only with TAp63 showed poor keratinocyte differentiation.
- Complementation with deltaNp63 alone led to significant basal layer formation.
- Dual complementation enhanced skin differentiation, restoring basal membrane and hemidesmosomes.
- deltaNp63 regulated basal layer genes (e.g., K14), while TAp63 regulated upper layer genes (e.g., K1, Ets-1).
Conclusions:
- The TAp63 and deltaNp63 isoforms play distinct and cooperative roles in epidermal development.
- deltaNp63 is critical for establishing the basal epidermal layer.
- TAp63 is involved in the differentiation of upper epidermal layers.
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