Transposon mutagenesis identifies candidate genes that cooperate with loss of transforming growth factor-beta signaling in mouse intestinal neoplasms

Shelli M. Morris, Jerry Davison, Kelly T. Carter, Rachele M. O'Leary, Patty Trobridge, Sue E. Knoblaugh, Lois L. Myeroff, Sanford D. Markowitz, Benjamin T. Brett, Todd E. Scheetz, Adam J. Dupuy, Timothy K. Starr, William M. Grady

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Colorectal cancer (CRC) results from the accumulation of gene mutations and epigenetic alterations in colon epithelial cells, which promotes CRC formation through deregulating signaling pathways. One of the most commonly deregulated signaling pathways in CRC is the transforming growth factor β (TGF-β) pathway. Importantly, the effects of TGF-β signaling inactivation in CRC are modified by concurrent mutations in the tumor cell, and these concurrent mutations determine the ultimate biological effects of impaired TGF-β signaling in the tumor. However, many of the mutations that cooperate with the deregulated TGF-β signaling pathway in CRC remain unknown. Therefore, we sought to identify candidate driver genes that promote the formation of CRC in the setting of TGF-β signaling inactivation. We performed a forward genetic screen in mice carrying conditionally inactivated alleles of the TGF-β receptor, type II (Tgfbr2) using Sleeping Beauty (SB) transposon mediated mutagenesis. We used TAPDANCE and Gene-centric statistical methods to identify common insertion sites (CIS) and, thus, candidate tumor suppressor genes and oncogenes within the tumor genome. CIS analysis of multiple neoplasms from these mice identified many candidate Tgfbr2 cooperating genes and the Wnt/β-catenin, Hippo and MAPK pathways as the most commonly affected pathways. Importantly, the majority of candidate genes were also found to be mutated in human CRC. The SB transposon system provides an unbiased method to identify Tgfbr2 cooperating genes in mouse CRC that are functionally relevant and that may provide further insight into the pathogenesis of human CRC.

Original languageEnglish (US)
Pages (from-to)853-863
Number of pages11
JournalInternational Journal of Cancer
Volume140
Issue number4
DOIs
StatePublished - Feb 15 2017

Keywords

  • Sleeping Beauty
  • Tgfbr2
  • colon
  • colorectal cancer
  • genetic screen

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    Morris, S. M., Davison, J., Carter, K. T., O'Leary, R. M., Trobridge, P., Knoblaugh, S. E., Myeroff, L. L., Markowitz, S. D., Brett, B. T., Scheetz, T. E., Dupuy, A. J., Starr, T. K., & Grady, W. M. (2017). Transposon mutagenesis identifies candidate genes that cooperate with loss of transforming growth factor-beta signaling in mouse intestinal neoplasms. International Journal of Cancer, 140(4), 853-863. https://doi.org/10.1002/ijc.30491