A lysosome-based mechanism of amino acid sensing by mTORC1 regulated by Rag GTPases has emerged. In this issue of Cancer Cell, Thomas and colleagues propose a Golgi-based and Rag-independent mechanism mediated by the Rab1A GTPase. Furthermore, Rab1A overexpression in colorectal cancers correlates with mTORC1 activity and sensitivity to mTOR inhibitors.
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