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. 2020 Dec 23;4(2):e202000808. doi: 10.26508/lsa.202000808

Figure 7. USP7 depletion constitutes an epigenetic vulnerability in synovial sarcoma.

Figure 7.

(A) Gene dependency score analysis for a panel of PRC1 members in SyS versus all other cell lines present in the DepMap database identifies USP7 as a selective vulnerability in SyS. Genes shown in red had an adjusted P-value < 0.05. (B) Heat map showing ChIP-seq signals for USP7 at 4877 SS18-SSX–binding sites in C3H10T1/2 cells. 20-kb windows centered on SS18-SSX–binding sites are shown. (C) Representative example of USP7 recruitment by SS18-SSX at its binding sites in C3H10T1/2 cells. (D, E) Proximity ligation assay analysis demonstrates direct interaction between USP7 and SS18-SSX in C3H10T1/2 and HSSYII SyS cells. (F) Proximity ligation assay shows a significant decrease in interactions between the ncPRC1 members RING1B and RYBP following USP7 removal in HSSYII cells. (G) Cell viability assays in SyS (HSSYII, SYO1) and EwS (A673, RDES) cells upon CRISPR-mediated USP7 KO confirm the selective detrimental effect of USP7 depletion in the SyS cells. *** indicates P-value < 0.0001. Statistical analyses were performed by t test. See also Fig S8.