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Mol. Cell. Biol., Aug 1995, 4095-4102, Vol 15, No. 8
C Grepin, L Robitaille, T Antakly and M Nemer
Commitment of mesodermal cells to the cardiac lineage is a very early event
that occurs during gastrulation, and differentiation of cardiac muscle
cells begins in the presomite stage prior to formation of the beating heart
tube. However, the molecular events, including gene products that are
required for differentiation of cardiac muscle cells, remain essentially
unknown. GATA-4 is a recently characterized cardiac muscle-restricted
transcription factor whose properties suggest an important regulatory role
in heart development. We tested the role of GATA-4 in cardiac
differentiation, using the pluripotent P19 embryonal carcinoma cells, which
can be differentiated into beating cardiac muscle cells. In this system,
GATA-4 transcripts and protein are restricted to cells committed to the
cardiac lineage, and induction of GATA-4 precedes expression of cardiac
marker genes and appearance of beating cells. Inhibition of GATA-4
expression by antisense transcripts blocks development of beating cardiac
muscle cells and interferes with expression of cardiac muscle markers.
These data indicate that GATA-4 is necessary for development of cardiac
muscle cells and identify for the first time a tissue-specific
transcription factor that may be crucial for early steps of mammalian
cardiogenesis.
Copyright © 1995, American Society for Microbiology
Inhibition of transcription factor GATA-4 expression blocks in vitro cardiac muscle differentiation
Laboratoire de Developpement et Differenciation Cardiaques, Universite de Montreal, Quebec, Canada.
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