Our knowledge of small cell lung cancer (SCLC) genetics is still very limited, amplifi cation of L-MYC , N-MYC , and C-MYC being some of the well-established gene alterations. Here, we report our discovery of tumor-specifi c inactivation of the MYC-associated factor X gene, MAX , in SCLC. MAX inactivation is mutually exclusive with alterations of MYC and BRG1 , the latter coding for an ATPase of the switch/sucrose nonfermentable (SWI/SNF) complex. We demonstrate that BRG1 regulates the expression of MAX through direct recruitment to the MAX promoter, and that depletion of BRG1 strongly hinders cell growth, specifi cally in MAX-defi cient cells, heralding a synthetic lethal interaction. Furthermore, MAX requires BRG1 to activate neuroendocrine transcriptional programs and to upregulate MYC targets, such as glycolysis-related genes. Finally, inactivation of the MAX dimerization protein, MGA, was also observed in both non-small cell lung cancer and SCLC. Our results provide evidence that an aberrant SWI/SNF-MYC network is essential for lung cancer development.
SIGNIFICANCE:We discovered that the MYC-associated factor X gene, MAX , is inactivated in SCLCs. Furthermore, we revealed a preferential toxicity of the inactivation of the chromatin remodeler BRG1 in MAX-defi cient lung cancer cells, which opens novel therapeutic possibilities for the treatment of patients with SCLC with MAX-defi cient tumors. Cancer Discov; 4(3);[292][293][294][295][296][297][298][299][300][301][302][303]