CRISPR/Cas9-Mediated Trp53 and Brca2 Knockout
Published OnlineFirst August 16, 2016; DOI: 10.1158/0008-5472.CAN-16-1272 Cancer Tumor and Stem Cell Biology Research CRISPR/Cas9-Mediated Trp53 and Brca2 Knockout to Generate Improved Murine Models of Ovarian High-Grade Serous Carcinoma Josephine Walton1,2, Julianna Blagih3, Darren Ennis1, Elaine Leung1, Suzanne Dowson1, Malcolm Farquharson1, Laura A. Tookman4, Clare Orange5, Dimitris Athineos3, Susan Mason3, David Stevenson3, Karen Blyth3, Douglas Strathdee3, Frances R. Balkwill2, Karen Vousden3, Michelle Lockley4, and Iain A. McNeish1,4 Abstract – – There is a need for transplantable murine models of ovarian ating novel ID8 derivatives that harbored single (Trp53 / )or – – – – high-grade serous carcinoma (HGSC) with regard to mutations in double (Trp53 / ;Brca2 / ) suppressor gene deletions. In these the human disease to assist investigations of the relationships mutants, loss of p53 alone was sufficient to increase the growth between tumor genotype, chemotherapy response, and immune rate of orthotopic tumors with significant effects observed on the microenvironment. In addressing this need, we performed whole- immune microenvironment. Specifically, p53 loss increased exome sequencing of ID8, the most widely used transplantable expression of the myeloid attractant CCL2 and promoted the model of ovarian cancer, covering 194,000 exomes at a mean infiltration of immunosuppressive myeloid cell populations into – – – – depth of 400Â with 90% exons sequenced >50Â. We found no primary tumors and their ascites. In Trp53 / ;Brca2 / mutant functional mutations in genes characteristic of HGSC (Trp53, cells, we documented a relative increase in sensitivity to the PARP Brca1, Brca2, Nf1, and Rb1), and p53 remained transcriptionally inhibitor rucaparib and slower orthotopic tumor growth – – active. Homologous recombination in ID8 remained intact in compared with Trp53 / cells, with an appearance of intratumoral þ functional assays.
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