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FoxA1/2-dependent epigenomic reprogramming drives lineage switching in lung adenocarcinoma.
bioRxiv 2023 November 3
The ability of cancer cells to alter their identity is essential for tumor survival and progression. Loss of the pulmonary lineage specifier NKX2-1 within KRAS-driven lung adenocarcinoma (LUAD) enhances tumor progression and results in a pulmonary-to-gastric lineage switch that is dependent upon the activity of pioneer factors FoxA1 and FoxA2; however, the underlying mechanism remains largely unknown. Here, we show that FoxA1/2 reprogram the epigenetic landscape of NKX2-1-negative LUAD to facilitate a gastric identity. After Nkx2-1 deletion, FoxA1/2 mediate demethylation of gastric-defining genes through recruitment of TET3, an enzyme that induces DNA demethylation. H3K27ac ChIP-seq and HiChIP show that FoxA1/2 also control the activity of regulatory elements and their 3D interactions at gastric loci. Furthermore, oncogenic KRAS is required for the FoxA1/2-dependent epigenetic reprogramming. This work demonstrates the role of FoxA1/2 in rewiring the methylation and histone landscape and cis-regulatory dynamics of NKX2-1-negative LUAD to drive cancer cell lineage switching.
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