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Combinatorial signals from the neural tube, floor plate and notochord induce myogenic bHLH gene expression in the somite

Münsterberg, Andrea E., Lassar, Andrew B.·1995·Development

Abstract

The neural tube, floor plate and notochord are axial tissues in the vertebrate embryo which have been demonstrated to play a role in somite morphogenesis. Using in vitro co-culture of tissue explants, we have monitored inductive interactions of these axial tissues with the adjacent somitic mesoderm in chick embryos. We have found that signals from the neural tube and floor plate/notochord are necessary for expression of the myogenic bHLH regulators MyoD, Myf5 and myogenin in the somite. Eventually somitic expression of the myogenic bHLH genes is main-tained in the absence of the axial tissues. In organ culture, at early developmental stages (HH 11-), induction of myogenesis in the three most recently formed somites can be mediated by the neural tube together with the floor plate/notochord, while in more rostral somites (stages IV-IX) the neural tube without the floor plate/notochord is sufficient. By recombining somites and neural tubes from different axial levels of the embryo, we have found that a second signal is necessary to promote competence of the somite to respond to inducing signals from the neural tube. Thus, we propose that at least two signals from axial tissues work in combination to induce myogenic bHLH gene expression; one signal derives from the floor plate/notochord and the other signal derives from regions of the neural tube other than the floor plate.

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Metadata

Authors
Münsterberg, A. E., & Lassar, A. B.
Venue
Development
Published
1995-03-01
Volume
121
Issue
3
Pages
651-660
ISSN
  • 0950-1991 (ISSN-L)
  • 1477-9129
OpenAlex
W2363598208
Cited by
192
References
1
FWCI
7.34
Type
journal article
Language
en
Open access
closed

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