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Related Experiment Video

Updated: Jun 26, 2026

Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation

Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation

Published on: January 12, 2022

Sim1 and Sim2 expression during chick and mouse limb development.

Pascal Coumailleau¹, Delphine Duprez

¹CNRS, UMR7622, Biologie Moleculaire et Cellulaire du Developpement, Universite Pierre et Marie Curie, Paris, France.

The International Journal of Developmental Biology

|January 6, 2009

Summary

Vertebrate Sim1 and Sim2 genes are crucial for limb muscle development. Their distinct expression patterns suggest roles in muscle progenitor cell migration and differentiation in both chick and mouse embryos.

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Area of Science:

Developmental Biology
Genetics
Neuroscience

Background:

The Drosophila Single minded (Sim) transcription factor regulates cell fate during midline development.
Mouse Sim1 and Sim2 genes are vital for central nervous system development, impacting neuroendocrine lineages and behavior.

Purpose of the Study:

To investigate the role of vertebrate Sim1 and Sim2 genes in embryonic limb muscle formation.
To analyze the spatiotemporal expression patterns of Sim1 and Sim2 during limb development in chick and mouse.

Main Methods:

In situ hybridization was used to examine Sim1 and Sim2 gene expression in chick and mouse embryonic limbs.
Expression patterns were analyzed in relation to limb muscle development stages.

Main Results:

Both Sim1 and Sim2 genes show expression patterns associated with limb muscle formation in chick and mouse embryos.
Sim1 expression correlates with early muscle progenitor cell migration, while Sim2 expression follows this stage.
Sim2 expression is notably higher in ventral muscle masses compared to dorsal masses.

Conclusions:

Vertebrate Sim genes play a significant role in limb muscle development.
The non-overlapping expression domains of Sim1 and Sim2 suggest distinct functions in different stages of muscle formation.
Further functional studies are warranted to elucidate the precise mechanisms of Sim genes in limb myogenesis.