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Volume 272, Number 45,
Issue of November 7, 1997
pp. 28550-28556
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
The Chicken GATA-6 Locus Contains Multiple Control
Regions That Confer Distinct Patterns of Heart Region-specific
Expression in Transgenic Mouse Embryos
(Received for publication, June 17, 1997, and in revised form, July 30, 1997)
Chao-Zhen
He
and
John B. E.
Burch
From the Institute for Cancer Research, Fox Chase Cancer Center,
Philadelphia, Pennsylvania 19111
The GATA-6 transcription factor is expressed in
cardiogenic cells and during subsequent stages of heart development in
diverse vertebrate species. To gain insights into the molecular events that govern this heart-restricted expression, we isolated the chicken
GATA-6 gene and used several approaches to screen for associated control regions. Our analysis of two chicken
GATA-6/lacZ constructs in transgenic mouse embryos was
particularly revealing. One GATA-6/lacZ construct, which
has 1.5 kilobase pairs of upstream sequences along with the promoter
and first intron, was expressed exclusively in the atrioventricular
canal region of the heart. This expression pattern is novel and appears
to mark specialized myocardial cells that induce underlying endocardial
cells to initiate valve formation. The other GATA-6/lacZ
construct, which has an additional 7.7 kilobase pairs of upstream
sequences, was expressed in the ventricle and outflow tract in addition
to the atrioventricular canal. The failure of these GATA-6
control regions to function as enhancers in transfected cardiac myocyte
cultures underscores the importance of using transgenic approaches to
elucidate transcriptional controls that function in the developing
heart. Although the endogenous GATA-6 gene is expressed
throughout the heart, our results indicate that this is effected in a
heart region-specific manner.

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Copyright © 1997 by the American Society for Biochemistry and Molecular Biology.
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