ArticleClinical and molecular hepatology2026
Co-repression of Yap1 and Sox9 abrogates established cholangiocarcinoma by eliminating transcriptional compensation.
Article in Clinical and molecular hepatology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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- Update ofCo-repression of2026
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Abstract
BACKGROUND/
aimsIntrahepatic cholangiocarcinoma (iCCA) represents an unmet clinical need due to its increasing incidence, aggressive biology, and limited treatment options. The extremely low-response rates to current systemic regimens and the emergence of adaptive resistance to targeted therapies underscore the urgent need for alternative therapeutic strategies. Given that the lineage-defining transcription factors SOX9 and YAP1 are central regulators of cholangiocyte and iCCA identity, we investigated their functional roles as potential therapeutic vulnerabilities across multiple preclinical models.
methodsPatient tissue-microarray analysis, Sleeping Beauty hydrodynamic tail vein injection-based iCCA models, and Cre-mediated inducible gene deletion systems were used to investigate the roles of Sox9 and Yap1. Deep-learning- based prediction, RNA-seq, chromatin immunoprecipitation sequencing and immunohistochemistry analyses were performed to delineate transcriptional networks and downstream effectors associated with SOX9/ YAP1 signaling.
resultsDual deletion of Sox9 and Yap1 effectively eradicated advanced iCCA while preserving intrahepatic bile ducts, regardless of oncogenic drivers. Mechanistically, SOX9 and YAP1 transcriptionally compensated for each other when one was absent, and ILF2 and MGAT5 were identified as key downstream effectors mediating this compensatory mechanism. Loss of Ilf2 and Mgat5 suppressed iCCA, whereas overexpression of Ilf2 following Sox9/Yap1 co-deletion restored tumor development, indicating that ILF2 can functionally substitute for YAP1 and SOX9 in sustaining iCCA.
conclusionsCo-targeting SOX9 and YAP1 offers a promising and safe broad-spectrum preventive/therapeutic approach for iCCA, potentially overcoming resistance to YAP1 inhibition. The adaptive resistance mechanism identified may extend to other malignancies, providing insights for addressing the advanced resistance to YAP1-TEAD-directed therapies.
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