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First published online 26 January 2005
doi: 10.1242/dev.01662

Development 132, 965-976 (2005)
Published by The Company of Biologists 2005
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E-cadherin intron 2 contains cis-regulatory elements essential for gene expression

Marc P. Stemmler1, Andreas Hecht2 and Rolf Kemler1,*

1 Department of Molecular Embryology, Max-Planck Institute of Immunobiology, Stuebeweg 51, D-79108 Freiburg, Germany
2 Andreas Hecht, Institute of Molecular Medicine and Cell Science, University of Freiburg, Stefan-Meier-Strasse 17, D-79104 Freiburg, Germany

* Author for correspondence (e-mail: kemler{at}immunbio.mpg.de)

Accepted 22 December 2004

Cadherin-mediated cell-cell adhesion plays important roles in mouse embryonic development, and changes in cadherin expression are often linked to morphogenetic events. For proper embryonic development and organ formation, the expression of E-cadherin must be tightly regulated. Dysregulated expression during tumorigenesis confers invasiveness and metastasis. Except for the E-box motifs in the E-cadherin promoter, little is known about the existence and location of cis-regulatory elements controlling E-cadherin gene expression. We have examined putative cis-regulatory elements in the E-cadherin gene and we show a pivotal role for intron 2 in activating transcription. Upon deleting the genomic intron 2 entirely, the E-cadherin locus becomes completely inactive in embryonic stem cells and during early embryonic development. Later in development, from E11.5 onwards, the locus is activated only weakly in the absence of intron 2 sequences. We demonstrate that in differentiated epithelia, intron 2 sequences are required both to initiate transcriptional activation and additionally to maintain E-cadherin expression. Detailed analysis also revealed that expression in the yolk sac is intron 2 independent, whereas expression in the lens and the salivary glands absolutely relies on cis-regulatory sequences of intron 2. Taken together, our findings reveal a complex mechanism of gene regulation, with a vital role for the large intron 2.

Key words: Cell adhesion, Knock-in, Transcription, Gene regulation, Gene expression, Mouse embryo, LCR, Comparative genomics


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