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Circling mouse, a spontaneous mutant in the inner ear
Jeong Woong Lee1, Zae Young Ryoo, Eun Ju Lee
1Laboratory Animal Center, Catholic Research Institutes of Medical Science, Catholic Medical College, Seoul 137-701, Korea.
Experimental Animals
|May 16, 2002
Summary
A new mouse mutation, cir, causes hyperactivity and circling behavior in young mice. This genetic mutation also leads to developmental defects in the inner ear structures.
Area of Science:
- Genetics
- Developmental Biology
- Neuroscience
Background:
- Spontaneous mutations are crucial for understanding gene function.
- Mouse models are essential for studying genetic disorders affecting development and behavior.
Purpose of the Study:
- To characterize a novel spontaneous mutation in ICR mice.
- To investigate the phenotypic effects of the cir mutation on development and behavior.
Main Methods:
- Establishment of a spontaneous mutant in the ICR mouse strain.
- Phenotypic analysis including behavioral observation and developmental assessment.
Main Results:
- Mutant mice exhibited hyperactivity and circling behavior starting around 7 days of age.
- Significant decrease in body weight observed by 2 weeks post-birth.
- Developmental defects identified in the middle ear, cochlea, cochlear nerve, and semicircular canals.
Conclusions:
- The spontaneous mutation, designated cir, is inherited as an autosomal single recessive gene.
- The cir mutation results in a complex phenotype involving neurological and developmental abnormalities, particularly affecting the auditory and vestibular systems.