Targetable vulnerabilities revealed through genetic interactions.

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Targetable vulnerabilities revealed through genetic interactions. Targetable vulnerabilities revealed through genetic interactions. (A) Pericentrin (red) and NEDD1 (green) staining for centrosomes and DAPI staining (blue) to indicate nuclei in PTTG1+/+ cells depleted after the knockdown of DHFR. (B) Representative images from a live‐cell experiment, where PTTG1+/+ cells were treated with 500 nM of MTX. Spindles were monitored with TUBB2C‐GFP and chromosomes with H2B‐BFP (see Supplementary Information for details). (C) Quantification of abnormal spindle morphology in PTTG1−/− cells expressing a negative control shRNA, shLACZ or PTTG1+/+ cells expressing shLacZ, shDHFR or treated with 500 nM MTX. At least 100 cells were analyzed for each experiment (n=3), **P<0.01, χ2‐test. Scale bar, 6 μm. (D) Matrix of relative expression levels of indicated genes (columns) in isogenic cell lines (rows). Red indicates levels are up and blue levels are down in resistant versus sensitive cells. (E) Schematic depicting the effect of Cetuximab (CTX) inhibition on EGFR‐RAS signaling. (F) Experimental workflow for the identification of synthetic lethal interactions with CTX in LIM1215 cells. (G) Scatter plot of zGARP scores for CTX‐treated and ‐untreated LIM1215 cell lines from primary screens. Genes that are synthetic lethal with CTX (P<0.05) are highlighted in red, whereas genes that are essential in both untreated and treated lines are highlighted in blue. (H) Synthetic lethal effect of CTX and CD83 shRNA in LIM1215 cells. Viability/cell number is depicted relative to the negative control shLacZ. Error bars represent 1 s.d. *P<0.05 and **P<0.001 calculated using a one‐tailed Student's t‐test (n=3). (I) Synthetic lethal effect of CD83 knockdown on KRASG13D/− cells is shown. Viability/cell number is depicted relative to the negative control shLacZ. Error bars represent 1 s.d. *P<0.05 and **P<0.01, one‐tailed Student's t‐test (n=3). NS, not significant. (J) Rescue experiment showing the on‐target effect of shRNAs targeting CD83, including sh1‐CD83 and sh2‐CD83. KRASG13D/− cells expressing GFP‐tagged CD83 or CD‐83‐shR were counted by flow cytometry 6 days after infection with sh1‐CD83, sh2‐CD83 or shLacZ as a negative control. (K) Overexpression of either GFP‐tagged wild‐type CD83, CD83‐GFP or GFP‐tagged shRNA‐resistant CD83 (shR‐CD83‐GFP) protein in KRASG13D/− cells showing correct membrane localization. (L) Experimental setup for validation of the negative genetic interaction between CTX and CD83 in an in vivo xenograft model. (M) Ten mice were dissected for each group and tumors were weighed (n=20). Error bars represent 1 s.d. (N) Schematic depicting possible genetic relationship between EGFR‐KRAS and CD83. Franco J Vizeacoumar et al. Mol Syst Biol 2013;9:696 © as stated in the article, figure or figure legend