Evolution of Runt Genes in Chordates and Their Role in Skeletogenesis
Author Information
Author(s): Hecht Jochen, Stricker Sigmar, Wiecha Ulrike, Stiege Asita, Panopoulou Georgia, Podsiadlowski Lars, Poustka Albert J., Dieterich Christoph, Ehrich Siegfried, Suvorova Julia, Mundlos Stefan, Seitz Volkhard
Primary Institution: Universitätsmedizin Charité, Berlin, Germany
Hypothesis
Runt genes played a role in the evolution of cartilage, bone, and teeth in chordates.
Conclusion
The study suggests that Runt genes were involved in ancient processes of chordate skeletogenesis and that a core gene network for cartilage formation was already active in the common ancestor of cephalochordates and vertebrates.
Supporting Evidence
- Runt genes were expressed in cartilage of hagfish and dogfish.
- Phylogenetic analysis suggests that the last common ancestor of jawed vertebrates had three Runt genes.
- Runt and Hedgehog genes were co-expressed in the gill bars of lancelets.
Takeaway
Runt genes are important for making bones and cartilage, and they have been around since the early ancestors of fish and other vertebrates.
Methodology
The study involved cloning Runt genes from hagfish and dogfish, analyzing their expression in various tissues, and conducting phylogenetic reconstructions.
Limitations
The study primarily focuses on a limited number of species and may not capture the full complexity of Runt gene evolution across all chordates.
Digital Object Identifier (DOI)
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