TCF4 and CDX2, major transcription factors for intestinal function, converge on the same cis-regulatory regions.
Proc Natl Acad Sci U S A
; 107(34): 15157-62, 2010 Aug 24.
Article
em En
| MEDLINE
| ID: mdl-20696899
ABSTRACT
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.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Fatores de Transcrição
/
Proteínas de Homeodomínio
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Fatores de Transcrição de Zíper de Leucina e Hélice-Alça-Hélix Básicos
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Mucosa Intestinal
Limite:
Humans
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article