Rac1b recruits Dishevelled and β-catenin to Wnt target gene promoters independent of Wnt3A stimulation

Pethe,Vaijayanti  V.; Charames,George  S.; Bapat,Bharati

doi:10.3892/ijo.2011.1066

Rac1b recruits Dishevelled and β-catenin to Wnt target gene promoters independent of Wnt3A stimulation

Authors:
- Vaijayanti V. Pethe
- George S. Charames
- Bharati Bapat
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Affiliations: Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, M5T 3L9, Canada, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario M5T 3L9, Canada
Published online on: June 6, 2011 https://doi.org/10.3892/ijo.2011.1066
Pages: 805-810

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Abstract

We previously reported a functional interaction between aberrant Wnt signaling and Rac1/Rac1b GTPases in tumorigenesis. In this study, we further investigated the mechanistic role of nuclear Rac1b. Using chromatin immunoprecipitation (ChIP) studies, we show that Rac1b resides at the promoters of Wnt target genes, c-Myc and Cyclin D1, in HCT116 cells with aberrant Wnt pathway. In HEK293T cells with intact Wnt signaling, Rac1b is tethered to these same gene promoters independent of Wnt3A stimulation and is further observed to recruit Dishevelled and β-catenin in the absence of Wnt3A stimulation. Our studies suggest a novel transcriptional co-activator role of Rac1b in β-catenin/TCF-mediated transcription.