Regulatory Elements Directing Gut Expression of the GATA 6 Gene during Mouse Early Development

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  • Sun-Wada Ge-Hong
    Division of Biological Sciences, The Institute of Scientific and Industrial Research, Osaka University
  • Kamei Yoichi
    Division of Biological Sciences, The Institute of Scientific and Industrial Research, Osaka University
  • Wada Yoh
    Division of Biological Sciences, The Institute of Scientific and Industrial Research, Osaka University
  • Futai Masamitsu
    Division of Biological Sciences, The Institute of Scientific and Industrial Research, Osaka University

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The GATA 6 transcription factor, as well as GATA 4 and GATA 5, is expressed in a variety of mammalian tissues including the precardiac mesoderm and endoderm, and gut-related organs. Genetic studies have also implicated GATA factors as important regulators of gut endoderm development. Previously, we identified the promoter and a cardiac-specific enhancer of mouse GATA6 [Sun-Wada et al. (2000) J. Biochem. 127, 703-709], however, little is known about the regulatory elements that govern GATA6 expression in the primitive gut. Here, we identified a distal enhancer of the GATA 6 gene directing expression in the gut by creating transgenic mice. A sequence of approximately 200 bp between -8.0 kb and -7.8 kb contains element (s) that enhance transcription in the gut during embryonic development, when linked to the hsp 68 promoter/lacZ fusion gene. Our results also show that GATA 6 expression is controlled by multiple regulatory regions including cardiac-specific and gut-specific enhancers.

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