Journal Article

Systematic profiling of conditional pathway activation identifies context-dependent synthetic lethalities

Jung, Nancy Y., van Tienen, Laurens M., Tseng, Yuen-Yi, Ruiz, Paloma, Song, Tian-Yu, Roth, Jennifer A., Rodriguez, Diego J., Ito, Takahiro, Sellers, William R., Kesar, Devishi, Atari, Adel, Ronan, Melissa, Chaturantabut, Saireudee, Rees, Matthew G., Li, Ruitong, Chang, Liang

2023

Overview

The paradigm of cancer-targeted therapies has focused largely on inhibition of critical pathways in cancer. Conversely, conditional activation of signaling pathways as a new source of selective cancer vulnerabilities has not been deeply characterized. In this study, we sought to systematically identify context-specific gene-activation-induced lethalities in cancer. To this end, we developed a method for gain-of-function genetic perturbations simultaneously across ~500 barcoded cancer cell lines. Using this approach, we queried the pan-cancer vulnerability landscape upon activating ten key pathway nodes, revealing selective activation dependencies of MAPK and PI3K pathways associated with specific biomarkers. Notably, we discovered new pathway hyperactivation dependencies in subsets of APC -mutant colorectal cancers where further activation of the WNT pathway by APC knockdown or direct β-catenin overexpression led to robust antitumor effects in xenograft and patient-derived organoid models. Together, this study reveals a new class of conditional gene-activation dependencies in cancer. Gain-of-function perturbation screens across 488 barcoded cell lines identify context-specific activation lethalities. The authors show that cells with MAPK, PI3K and WNT pathway activation are vulnerable to mutations that lead to further activation, suggesting a new strategy for treating tumors driven by these oncogenic pathways.

• Publisher: Nature Publishing Group US,Nature Publishing Group
• Subject: 45/91 / 631/208/191 / 631/67 / 64/60 / 96/106 / Adenomatous polyposis coli / Agriculture / Animal Genetics and Genomics / Anticancer properties / Antitumor activity / Bar codes / beta Catenin - genetics / Biomarkers / Biomedical and Life Sciences / Biomedicine / Cancer / Cancer Research / Cell cycle / Cell Line, Tumor / Cell Proliferation / Colorectal cancer / Colorectal Neoplasms - pathology / CRISPR / Datasets / Gene Function / Genes / Human Genetics / Humans / Infections / Kinases / MAP kinase / Melanoma / Mutation / Organoids / Perturbation / Phosphatidylinositol 3-Kinases / Tumor cell lines / Wnt protein / Wnt Signaling Pathway - genetics / Xenotransplantation / β-Catenin