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Genome-scale CRISPR-Cas9 screen identifies druggable dependencies in TP53 wild-type Ewing sarcoma

Genome-scale CRISPR-Cas9 screen identifies druggable dependencies in TP53 wild-type Ewing sarcoma

Björn Stolte, Amanda Balboni Iniguez, Neekesh V Dharia, Amanda L Robichaud, Amy Saur Conway, Ann M Morgan, Gabriela Alexe, Nathan J Schauer, Xiaoxi Liu, Gregory H Bird, Aviad Tsherniak, Francisca Vazquez, etc.

J Exp Med. 2018 Aug 6;215(8):2137-2155.

PMID: 30045945

Abstract:

Ewing sarcoma is a pediatric cancer driven by EWS-ETS transcription factor fusion oncoproteins in an otherwise stable genomic background. The majority of tumors express wild-type TP53, and thus, therapies targeting the p53 pathway would benefit most patients. To discover targets specific for TP53 wild-type Ewing sarcoma, we used a genome-scale CRISPR-Cas9 screening approach and identified and validated MDM2, MDM4, USP7, and PPM1D as druggable dependencies. The stapled peptide inhibitor of MDM2 and MDM4, ATSP-7041, showed anti-tumor efficacy in vitro and in multiple mouse models. The USP7 inhibitor, P5091, and the Wip1/PPM1D inhibitor, GSK2830371, decreased the viability of Ewing sarcoma cells. The combination of ATSP-7041 with P5091, GSK2830371, and chemotherapeutic agents showed synergistic action on the p53 pathway. The effects of the inhibitors, including the specific USP7 inhibitor XL-188, were rescued by concurrent TP53 knockout, highlighting the essentiality of intact p53 for the observed cytotoxic activities.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1404456536	GSK2830371		1404456-53-6	Price
AP882257116	P5091		882257-11-6	Price

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