A Missing Link in Genotype-Directed Cancer Therapy

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A Missing Link in Genotype-Directed Cancer Therapy René Bernards  Cell  Volume 151, Issue 3, Pages 465-468 (October 2012) DOI: 10.1016/j.cell.2012.10.014 Copyright © 2012 Elsevier Inc. Terms and Conditions

Figure 1 Feedback Circuits between Signaling Pathways (A) Feedback circuits often display synthetic lethal interactions. Inhibition of a single activated component (in orange) of a major signal transduction pathway can lead to feedback activation of another signaling pathway, which supports cell viability while the oncogenic driver is inhibited (center). Only combined inhibition of both the oncogenic driver and the target of the feedback circuit leads to cell death (right). (B) Genetic screens to identify synthetic lethal interactions. Cancer cells are infected with collections of retroviral shRNA vectors. Infected cells are divided into two duplicate populations, of which one is treated with a drug that targets a cancer-specific oncogenic lesion. The cancer cell only dies when a critical component of the feedback circuit is inactivated by shRNA, leading to depletion of that specific shRNA from the population. Drug-depleted shRNA vectors can be identified through deep sequencing of bar code identifiers that are present in each shRNA vector. Cell 2012 151, 465-468DOI: (10.1016/j.cell.2012.10.014) Copyright © 2012 Elsevier Inc. Terms and Conditions