{
  "id": 11252056,
  "title": "How loss of the critical tumor suppressor p53 enables mutant cells to expand through normal tissue",
  "url": "https://urgent.news/2026/10/01/how-loss-of-the-critical-tumor-suppressor-p53-enables-mutant-cells-to",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-01T18:00:24.000Z",
  "source": {
    "name": "Medical Xpress",
    "slug": "medical-xpress",
    "url": "https://medicalxpress.com/news/2026-10-loss-critical-tumor-suppressor-p53.html"
  },
  "original_language": "en",
  "account": "The tumor suppressor protein p53 is frequently mutated in human cancers, often leading to its absence or loss of function. This loss allows populations of mutant cells to expand through normal tissue. Researchers at the Icahn School of Medicine at Mount Sinai discovered that p53 loss reorganizes Wnt signaling, a key pathway controlling tissue growth and development. Instead of simply reducing overall Wnt activity, p53 loss creates a gradient of Wnt signaling, with lower activity near the edge of a mutant cell cluster and higher activity toward the center. This spatial organization of Wnt signals, rather than just the overall level of activity, determines how effectively mutant cells can expand. When researchers disrupted this gradient, mutant cells had difficulty overcoming neighboring normal cells. In mouse skin, p53 loss promoted the expansion of mutant clones by favoring the self-renewal of progenitor cells over their differentiation into mature cells. This effect, driven by a shift in cell fate, allowed the mutant clones to continue expanding through normal tissue. The study identified three genes—Sfrp1, Lrp1, and Usp22—directly regulated by p53 that help restrain Wnt signaling. When p53 was lost, Wnt activity increased and formed the radial gradient. Clones with this gradient expanded efficiently, while those with more uniformly elevated Wnt activity expanded less effectively. The findings suggest that understanding how cell signaling pathways are arranged in space is crucial for comprehending how cancer-associated mutations can reshape tissue organization even before a tumor forms.",
  "summary": "A protein known as p53 is, of all tumor suppressors in human cancer, the most frequently altered by gene mutations. When mutations cause it to be absent or nonfunctional, its loss can allow populations of mutant cells to expand through normal tissue. Researchers have long known that loss of p53 does more than remove a block to cell growth. But how p53 loss changes tissue behavior to permit this…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}