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- W3086774906 abstract "Forward genetic screens in mammalian cell lines, such as RNAi and CRISPR-Cas9 screens, have made major contributions to the elucidation of diverse signaling pathways. Here, we exploited human haploid cells as a robust comparative screening platform and report a set of quantitative forward genetic screens for identifying regulatory mechanisms of mTORC1 signaling, a key growth control pathway that senses diverse metabolic states. Selected chemical and genetic perturbations in this screening platform, including rapamycin treatment and genetic ablation of the Ragulator subunit LAMTOR4, revealed the known core mTORC1 regulatory signaling complexes and the intimate interplay of the mTORC1 pathway with lysosomal function, validating the approach. In addition, we identified a differential requirement for LAMTOR4 and LAMTOR5 in regulating the mTORC1 pathway under fed and starved conditions. Furthermore, we uncovered a previously unknown synthetic-sick interaction between the tumor suppressor folliculin and LAMTOR4, which may have therapeutic implications in cancer treatment. Together, our study demonstrates the use of iterative perturb and observe genetic screens to uncover regulatory mechanisms driving complex mammalian signaling networks." @default.
- W3086774906 created "2020-09-21" @default.
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- W3086774906 date "2020-09-15" @default.
- W3086774906 modified "2023-10-03" @default.
- W3086774906 title "Quantitative genetic screening reveals a Ragulator-FLCN feedback loop that regulates the mTORC1 pathway" @default.
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- W3086774906 doi "https://doi.org/10.1126/scisignal.aba5665" @default.
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