The mutants were initially detected based on abnormal pre-pulse-inhibition test results. They were subsequently observed to exhibit a slight head tilt and circling behavior (onset at approximately 4 weeks of age), and the mutant line was established based on the overt phenotype. Testing of auditory brainstem responses revealed the mutants (n=4) to be deaf. The vestibular abnormality of nmf112 was mapped as a recessive phenotype in 19 affected and 20 unaffected (C57BL/6J-nmf112 x BALB/cByJ) F2 intercross mice, and the best linkage was to D10Mit138 (LOD = 7.0) and D10Mit15 (LOD = 6.1). Because of the map position of this mutation and its phenotypic similarity to the waltzer mutations, a series of complementation tests was performed to determine if allelic relationships exist between NMF112, NMF181, NMF252 and Cdh23. The results showed NMF112 to be an allele of NMF181 (one mating produced 2 mutants in a total of 7 progeny), of NMF252 (one mating produced 2 mutants in a total of 5 progeny) and therefore of Cdh23, since NMF252 has been identified as a new allele of Cdh23. This information suggests therefore that NMF112 mutants might be useful for studying neurobiological mechanisms related to Usher syndrome and human deafness.

Standard pathology work-up on one mutant that died while undergoing ECT testing (94 days of age) showed signs of otitis. The bones of the inner ear had degenerated, possibly due to chronic otitis. Standard pathological work-up and serial sections of ears on two additional mutants (38 days of age) showed no abnormalities.

These mice carry an ENU-induced mutation characterized by a slight head tilt, circling behavior, and deafness.

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