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Published on: January 2, 2016
N-myc controls proliferation, morphogenesis, and patterning of the inner ear
Elena Domínguez-Frutos1, Iris López-Hernández, Victor Vendrell
1Institute of Biology and Molecular Genetics, University of Valladolid and Spanish National Research Council, E-47003 Valladolid, Spain.
Summary
N-myc is essential for inner ear development, controlling growth and pattern formation. Its absence leads to severe defects in inner ear morphogenesis and organ of Corti development.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- Myc family proteins regulate cell proliferation, size, and differentiation.
- N-myc and c-myc are expressed during mouse inner ear development.
Purpose of the Study:
- To investigate the function of N-myc and c-myc in mouse inner ear development.
- To determine the role of N-myc in inner ear morphogenesis and cell cycle regulation.
Main Methods:
- Generation of mice with conditional deletions of N-myc or c-myc in the inner ear.
- Analysis of inner ear morphology, cell proliferation, and molecular markers in mutant mice.
Main Results:
- Loss of c-myc had no apparent effect; N-myc inactivation resulted in reduced growth due to lack of proliferation.
- N-myc mutant mice exhibited severe inner ear morphogenesis defects, including abnormal cochlear development and fused structures.
- Mutant cochleas showed increased p27(Kip1) expression and lack of cyclin D1, affecting hair cell differentiation and organization.
Conclusions:
- N-myc is critical for regulating inner ear growth, morphogenesis, and pattern formation.
- N-myc controls cell cycle exit and the proper organization of the organ of Corti.
- N-myc deficiency disrupts the development of hair cells and supporting cells in the inner ear.
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