Related Experiment Videos
mdfw: a deafness susceptibility locus that interacts with deaf waddler (dfw)
K Noben-Trauth1, Q Y Zheng, K R Johnson
1Jackson Laboratory, Bar Harbor, Maine 04609, USA. kntrauth@pop.nidcd.nih.gov
Genomics
|November 5, 1997
Summary
A new deaf waddler (dfw2J) allele in mice reveals a second gene, mdfw, interacting with dfw. This interaction causes progressive hearing loss in heterozygotes, offering a model for nonsyndromic hearing defects.
Area of Science:
- Genetics
- Neuroscience
- Auditory Biology
Background:
- The deaf waddler (dfw) mutation serves as a model for studying neuroepithelial hearing defects.
- Understanding genetic interactions is crucial for deciphering complex hearing loss mechanisms.
Purpose of the Study:
- To identify and characterize a new allele of the deaf waddler mutation (dfw2J).
- To investigate genetic interactions influencing hearing function in mice.
- To map a novel hearing susceptibility locus (mdfw) interacting with dfw.
Main Methods:
- Auditory Brainstem Response (ABR) testing was used to assess hearing function in mice.
- Genetic linkage analysis was performed to map the mdfw locus.
- Crossbreeding experiments were conducted between different mouse strains (CBy and CAST/Ei).
Main Results:
- Homozygous CBy-dfw2J/dfw2J mice exhibited profound deafness.
- Heterozygous CBy-dfw2J/+ mice showed age-dependent progressive hearing loss.
- A second locus, mdfw, on Chromosome 10 was identified, interacting epistatically with dfw.
- The recessive CBy-derived allele (mdfwC) at the mdfw locus is required for hearing loss in dfw2J/+ heterozygotes.
Conclusions:
- The dfw2J allele and the mdfw locus interact to cause progressive hearing loss in mice.
- This interaction provides a novel genetic model for studying nonsyndromic hearing loss.
- The findings highlight the complexity of genetic contributions to auditory function.