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Related Experiment Videos

A Tcf4-positive mesodermal population provides a prepattern for vertebrate limb muscle patterning.

Gabrielle Kardon1, Brian D Harfe, Clifford J Tabin

  • 1Department of Genetics, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA.

Developmental Cell
|December 12, 2003
PubMed
Summary

Researchers discovered that Tcf4-expressing cells in limb mesoderm create a prepattern crucial for muscle formation. This finding clarifies limb muscle development and identifies key molecular signals.

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Area of Science:

  • Developmental biology
  • Molecular biology
  • Genetics

Background:

  • Myogenic cells migrate from somites to developing limbs, differentiating into myotubes and forming anatomical muscles.
  • Limb signals are hypothesized to direct muscle pattern formation, but their molecular nature and source remain unclear.

Purpose of the Study:

  • To identify the molecular signals and cell populations responsible for limb muscle patterning.
  • To elucidate the role of the transcription factor Tcf4 and Wnt-beta-catenin pathway in limb muscle development.

Main Methods:

  • Identification of Tcf4-expressing cells in chick and mouse limb mesoderm.
  • Functional experiments in chick embryos to assess the role of TCF4 and Wnt-beta-catenin signaling.

Main Results:

Related Experiment Videos

  • A population of lateral plate-derived limb mesodermal cells expressing Tcf4 was identified, independent of muscle cells.
  • TCF4 and Wnt-beta-catenin pathway in limb mesodermal cells are critical for establishing muscle patterns.

Conclusions:

  • Tcf4-expressing cells establish a prepattern in the limb mesoderm.
  • This prepattern dictates myogenic differentiation sites, thereby organizing limb muscle formation.