Identification and characterisation of novel mouse models for recessively inherited deafness.

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Hearing loss affects 10% of Australians. Approximately 1 in 1000 children is born deaf. Another 1 in 1000 people develops hearing loss by adulthood. A progressive hearing impairment occurs with age so that more than 50% of people over the age of 75 have a substantial hearing loss. The financial, social and personal costs of deafness are significant. Deafness is caused by environmental and- or inherited factors. Environmental risk factors include premature birth, infections and exposure to loud noise. Inherited factors include changes (mutations) in one of many genes whose products are essential for normal hearing. In the majority of children and young people with a hearing impairment the underlying cause is genetic. It is also thought that genetic predisposition frequently contributes to the early onset and the severity of age-related hearing loss. However, it has been difficult to identify the genes causing deafness, and as a consequence we know relatively little about what these genes do. The mouse ear is very similar to the human ear and in this application we propose to use mice to identify and study deafness genes. Australia has a unique resource of mice that are being especially bred to uncover genetic diseases. We have shown that 1 in a 1,000 of these mice have a genetic hearing loss similar to that found in most newborns and young people. These mice therefore provide us with an exceptional opportunity to discover novel deafness genes, which again will provide us with more information about how we hear. We will investigate why changes in these genes causes hearing loss and this information will allow us to determine in detail how genetic and environmental factors lead to hearing loss in young and old. The results will immediately allow us to offer earlier diagnosis and better counselling to affected families, and in the longer term we believe our research will enable us to develop improved or novel treatments to delay or prevent deafness.