Impacts of mutation accumulation and order on tumor initiation revealed by engineered murine colorectal cancer organoids.

In murine colorectal cancer organoids, the order of Kras, Apc, and Trp53 mutation accumulation changes tumor-forming potential, with Trp53 loss before Apc inactivation reducing growth in immunocompetent mice.

• Why it matters: Multi-hit tumorigenesis depends on accumulating mutations, but how their temporal order shapes early colorectal cancer initiation is unclear, limiting mechanistic interpretation of adenoma-to-carcinoma progression.
• What they did: The study engineered murine intestinal organoids with defined Kras, Apc, and Trp53 combinations introduced in distinct orders, then assessed growth in vitro and tumorigenicity in immunodeficient versus immunocompetent mice.
• The result: Mutation accumulation conferred growth advantages in both settings, while mutation order altered organoid phenotypes and tumorigenicity; notably, Trp53 loss preceding Apc inactivation showed reduced tumor-forming potential in immunocompetent mice, likely linked to distinct immunological features.

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