Abstract
We performed a high-throughput retroviral insertional mutagenesis screen in mouse mammary tumor virus (MMTV)-induced mammary tumors and identified 33 common insertion sites, of which 17 genes were previously not known to be associated with mammary cancer and 13 had not previously been linked to cancer in general. Although members of the Wnt and fibroblast growth factors (Fgf) families were frequently tagged, our exhaustive screening for MMTV insertion sites uncovered a new repertoire of candidate breast cancer oncogenes. We validated one of these genes, Rspo3, as an oncogene by overexpression in a p53-deficient mammary epithelial cell line. The human orthologs of the candidate oncogenes were frequently deregulated in human breast cancers and associated with several tumor parameters. Computational analysis of all MMTV-tagged genes uncovered specific gene families not previously associated with cancer and showed a significant overrepresentation of protein domains and signaling pathways mainly associated with development and growth factor signaling. Comparison of all tagged genes in MMTV and Moloney murine leukemia virus–induced malignancies showed that both viruses target mostly different genes that act predominantly in distinct pathways.
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Acknowledgements
We are grateful to J. Hodzic, S. Bousata and P. van Schouwenburg for help with the insertional mutagenesis assay, M. Mandjes and D. Nuyten for help with the computational analyses and M. Voorhoeve for his critical comments. Parts of this study were performed for the thesis of M. K. at the medical faculty of Ludwig-Maximilians-Universität München. This work was supported by the Dutch Cancer Society (grant 2001-2489).
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Contributions
V.T. developed the insertional mutagenesis screening protocol; performed a large part of the screen, the computational and expression analyses and gene cloning and wrote most of the manuscript. M.A.K. contributed to the development of the screening protocol, performed a substantial part of the insertional mutagenesis screen and performed some of the DNA blots. W.T. contributed to the insertional mutagenesis screen and expression analysis. M.B. performed the animal experiments and contributed to the tissue culture work. L.W. performed the statistical analyses. J.J. gave advice, contributed in the writing of the manuscript and performed some of the DNA blotting experiments. J.H. designed the study and contributed to the retroviral transduction and animal experiments and the writing of the manuscript.
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Supplementary information
Supplementary Fig. 1
Expression analysis of candidate cancer genes. (PDF 805 kb)
Supplementary Fig. 2
Oligoclonality of the Rspo3- and Wnt-induced tumors. (PDF 493 kb)
Supplementary Table 1
MMTV proviral insertion sites and associated genes. (PDF 309 kb)
Supplementary Table 2
Expression analysis of MMTV-tagged genes. (PDF 39 kb)
Supplementary Table 3
NIH-DAVID Gene Ontology analysis of MMTV-targeted genes. (PDF 62 kb)
Supplementary Table 4
Gene Ontology analysis of MULV-tagged genes in lymphomas using NIH-DAVID. (PDF 15 kb)
Supplementary Table 5
Gene Ontology analysis of MULV-tagged genes in brain tumors using NIH-DAVID. (PDF 38 kb)
Supplementary Table 6
PCR primers. (PDF 22 kb)
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Theodorou, V., Kimm, M., Boer, M. et al. MMTV insertional mutagenesis identifies genes, gene families and pathways involved in mammary cancer. Nat Genet 39, 759–769 (2007). https://doi.org/10.1038/ng2034
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DOI: https://doi.org/10.1038/ng2034
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