Loss of the tumor suppressor p53 generates a signaling gradient that drives epithelial clonal expansion.

Loss of p53 creates a Wnt activity gradient that promotes epithelial clonal expansion, revealing spatial organization as a key factor in tumor development.

• Why it matters: Understanding how p53 mutations lead to uncontrolled cell growth is crucial for developing targeted cancer therapies, as these mutations are common in epithelial cancers.
• What they did: The study used mouse epidermis, chromatin immunoprecipitation sequencing, transcriptional analyses, and genetic screens to identify a p53-dependent network involving Sfrp1, Lrp1, and Usp22 that regulate progenitor cell renewal and differentiation.
• The result: Loss of p53 suppresses these targets, generating a Wnt activity gradient that sustains clonal expansion, highlighting spatial organization as a driver of tissue colonization in cancer progression.