TCF4 and CDX2, major transcription factors for intestinal function, converge on the same cis-regulatory regions

M.P. Verzi, P. Hatzis, R. Sulahian, J. Philips, J. Schuijers, H.D. Shin, E. Freed, J.P. Lynch, D.T. Dang, M. Brown, H. Clevers, X.S. Liu, R.A. Shivdasani

Onderzoeksoutput: Bijdrage aan wetenschappelijk tijdschrift/periodieke uitgaveArtikelWetenschappelijkpeer review

Samenvatting

Surprisingly few pathways signal between cells, raising questions about mechanisms for tissue-specific responses. In particular, Wnt ligands signal in many mammalian tissues, including the intestinal epithelium, where constitutive signaling causes cancer. Genome-wide analysis of DNA cis-regulatory regions bound by the intestine-restricted transcription factor CDX2 in colonic cells uncovered highly significant overrepresentation of sequences that bind TCF4, a transcriptional effector of intestinal Wnt signaling. Chromatin immunoprecipitation confirmed TCF4 occupancy at most such sites and co-occupancy of CDX2 and TCF4 across short distances. A region spanning the single nucleotide polymorphism rs6983267, which lies within a MYC enhancer and confers colorectal cancer risk in humans, represented one of many co-occupied sites. Co-occupancy correlated with intestine-specific gene expression and CDX2 loss reduced TCF4 binding. These results implicate CDX2 in directing TCF4 binding in intestinal cells. Co-occupancy of regulatory regions by signal-effector and tissue-restricted transcription factors may represent a general mechanism for ubiquitous signaling pathways to achieve tissue-specific outcomes.
Originele taal-2Engels
Pagina's (van-tot)15157-15162
TijdschriftProceedings of the National Academy of Sciences of the United States of America
Volume107
Nummer van het tijdschrift34
DOI's
StatusGepubliceerd - 2010

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