Meso-scale spatial analysis of papilloma formation and clonal expansion in cancerized skin.

Meso-scale spatial analysis reveals that tissue signaling programs constrain the expansion of papilloma clones in cancerized skin, with field-level signaling rewiring before tumor formation.

• Why it matters: Understanding how tissue context influences clonal selection is crucial because many somatic mutations occur in normal tissues but only a few lead to tumors, highlighting the importance of local signaling environments in cancer development.
• What they did: The study applied spatially resolved genotyping and transcriptomics, including WES, bulk RNA-seq, and single-cell RNA-seq, to mouse back skin subjected to a carcinogenesis model, analyzing 473 samples and 690 transcriptomes.
• The result: Findings show that programs like differentiation, necroptosis, and TGFB signaling topology reshape the selective landscape, limiting driver mutation potency and explaining variation in clone expansion and tumor progression.