Related Experiment Video
Updated: Jun 20, 2026
11:02
Chromatin Immunoprecipitation Assay for Tissue-specific Genes using Early-stage Mouse Embryos
Published on: April 29, 2011
Expression pattern and role of Galectin1 during early mouse myogenesis
Hiroki Shoji1, Louise Deltour, Takanori Nakamura
1Department of Developmental Biology, Institut Jacques Monod, CNRS 7592, Paris-Diderot University, Paris, France.
Development, Growth & Differentiation
|August 29, 2009
Summary
Galectin1 acts as an early marker in embryonic muscle development, appearing in somites by day 9.0. While downstream of Myf5, it is not essential for initial muscle formation in embryos.
Area of Science:
- Developmental Biology
- Muscle Stem Cell Biology
- Molecular Genetics
Background:
- Galectin1 (Gal1) is a carbohydrate-binding protein known to influence adult muscle stem cell behavior and regeneration.
- Its precise role and timing during embryonic muscle development have not been fully elucidated.
- Understanding Gal1's function during myogenesis is crucial for comprehending muscle lineage establishment.
Purpose of the Study:
- To determine the earliest expression of Galectin1 in the developing muscle lineage.
- To investigate the relationship between Galectin1 and key muscle determination factors, Myf5 and Myod.
- To assess the necessity of Galectin1 for early muscle development in mouse embryos.
Main Methods:
- Analysis of Galectin1 transcript and protein localization during mouse embryogenesis, starting from day 9.0.
- Comparative spatio-temporal expression studies of Galectin1 in wild-type and Myf5 null mutant embryos.
- Phenotypic analysis of Galectin1 null mutant embryos to evaluate early myogenesis.
Main Results:
- Galectin1 transcripts and protein are first detected in the somites by embryonic day 9.0, marking it as an early myogenesis marker.
- Galectin1 expression is found to be downstream of the muscle determination factor Myf5.
- Absence of Galectin1 in null mutant embryos does not impair early myogenesis, suggesting a non-essential role in developmental muscle fate acquisition.
Conclusions:
- Galectin1 serves as an early molecular marker during embryonic muscle development, originating in the somites.
- Its expression is regulated by Myf5, positioning it downstream in the developmental pathway.
- Contrary to its role in adults, Galectin1 is not required for the initial establishment of muscle cell fate during embryogenesis.
Related Concept Videos
01:13Formation of Muscle Fibers from Myoblasts
De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription factors...
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription factors...
01:56Gastrulation
Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...