Xenopus embryos contain a somite-specific, MyoD-like protein that binds to a promoter site required for muscle actin expression.

Abstract:

:We identify the "M region" of the muscle-specific Xenopus cardiac actin gene promoter from -282 to -348 as necessary for the embryonic expression of a cardiac actin-beta-globin reporter gene injected into fertilized eggs. Four DNA-binding activities in embryo extracts, embryonic M-region factors 1-4 (EMF1-4), are described that interact specifically with this region. One of these, EMF1, is detected in extracts from microdissected somites, which differentiate into muscle, but not in extracts from the adjacent neurectoderm, which differentiates into a variety of other cell types. Moreover, EMF1 is detected in embryo animal caps induced to form mesoderm, which includes muscle, and in which the cardiac actin gene is activated, but not in uninduced animal caps. EMF1 is also first detectable when cardiac actin transcripts begin to accumulate; therefore, both its temporal and spatial distributions during Xenopus development are consistent with a role in activating cardiac actin expression. Two lines of evidence suggest that EMF1 contains the myogenic factor Xenopus MyoD (XMyoD): (1) XMyoD synthesized in vitro can bind specifically to the same site as EMF1; and (2) antibodies raised against XMyoD bind to EMF1. DNA-binding studies indicate that EMF1 may be a complex between XMyoD and proteins found in muscle and other tissues. Our results suggest that the myogenic factor XMyoD, as a component of somite EMF1, regulates the activation of the cardiac actin gene in developing embryonic muscle by binding directly to a necessary region of the promoter.

journal_name

Genes Dev

journal_title

Genes & development

authors

Taylor MV,Gurdon JB,Hopwood ND,Towers N,Mohun TJ

doi

10.1101/gad.5.7.1149

subject

Has Abstract

pub_date

1991-07-01 00:00:00

pages

1149-60

issue

7

eissn

0890-9369

issn

1549-5477

journal_volume

5

pub_type

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