Related Experiment Videos
The mouse rib-vertebrae mutation is a hypomorphic Tbx6 allele
Masami Watabe-Rudolph1, Nicole Schlautmann, Virginia E Papaioannou
1Institut für Molekularbiologie, Medizinische Hochschule, Carl-Neuberg-Strasse 1, D-30625 Hannover, Germany.
Mechanisms of Development
|December 5, 2002
Summary
The mouse mutation Rib-vertebrae (rv) affects somite formation and is caused by a regulatory mutation in the Tbx6 gene. This mutation leads to down-regulated Tbx6 expression, impacting embryonic development.
Area of Science:
- Developmental biology
- Genetics
- Molecular biology
Background:
- The Rib-vertebrae (rv) mutation in mice disrupts somite formation, morphology, and patterning.
- Altered expression of Notch pathway components is observed in the paraxial mesoderm of rv mutant embryos.
- Non-allelic non-complementation between rv and a delta1 null allele suggests involvement of the Notch signaling pathway.
Purpose of the Study:
- To identify the gene responsible for the Rib-vertebrae (rv) mutation.
- To elucidate the molecular mechanism underlying the rv phenotype.
- To understand the role of Tbx6 in embryonic development.
Main Methods:
- Fine genetic mapping of the rv mutation in mice.
- Complementation testing with known alleles.
- Analysis of Tbx6 gene expression in wild-type and mutant embryos.
- Genomic analysis to identify mutations in the Tbx6 promoter region.
Main Results:
- The Tbx6 gene was identified as the gene mutated in the Rib-vertebrae (rv) mouse.
- Compound heterozygotes of Tbx6 null and rv alleles exhibited an intermediate phenotype.
- Tbx6 expression was found to be down-regulated in rv mutant embryos.
- An insertion in the Tbx6 promoter region was identified in rv mutant mice.
Conclusions:
- The Rib-vertebrae (rv) mutation is a regulatory mutation affecting Tbx6.
- This mutation results in a hypomorphic Tbx6 phenotype, impacting embryonic development.
- The findings highlight the critical role of Tbx6 regulation in somite formation and patterning.