Abstract:
:Although it has become increasingly clear that cancers display extensive cellular heterogeneity, the spatial growth dynamics of genetically distinct clones within developing solid tumours remain poorly understood. Here we leverage mosaic analysis with double markers (MADM) to trace subclonal populations retaining or lacking p53 within oncogenic Kras-initiated lung and pancreatic tumours. In both models, p53 constrains progression to advanced adenocarcinomas. Comparison of lineage-related p53 knockout and wild-type clones reveals a minor role of p53 in suppressing cell expansion in lung adenomas. In contrast, p53 loss promotes both the initiation and expansion of low-grade pancreatic intraepithelial neoplasia (PanINs), likely through differential expression of the p53 regulator p19ARF. Strikingly, lineage-related cells are often dispersed in lung adenomas and PanINs, contrasting with more contiguous growth of advanced subclones. Together, these results support cancer type-specific suppressive roles of p53 in early tumour progression and offer insights into clonal growth patterns during tumour development.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Muzumdar MD,Dorans KJ,Chung KM,Robbins R,Tammela T,Gocheva V,Li CM,Jacks Tdoi
10.1038/ncomms12685subject
Has Abstractpub_date
2016-09-02 00:00:00pages
12685issn
2041-1723pii
ncomms12685journal_volume
7pub_type
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