April 28, 2009
Diminuendo ““ New Mouse Model For Progressive Hearing Loss
Scientists of Helmholtz Zentrum Mnchen have developed a new mouse model that can be associated with deafness. With this model they succeeded for the first time in showing that microRNA, a new class of genes, influences hearing loss. The respective microRNA seed region influences the production of sensory hair cells in the inner ear, both in the mouse and in humans. The findings have been published ahead of print in the current online issue of Nature Genetics. This study represents a major step forward in elucidating the common phenomenon of progressive hearing loss, opening up new avenues for treatment.
Scientists of Helmholtz Zentrum Mnchen, led by Professor Martin Hrab© de Angelis, director of the Institute of Experimental Genetics, have developed a new mouse model with a genetic mutant in which a single base of a specific microRNA seed region has been altered. Mice carrying this miR-96 mutation suffer progressive hearing loss as they get older. Moreover, if they carry two of these mutants, their sensory hair cells are impaired from birth on.
A number of genes associated with hearing loss were already known. "However, we were very surprised when with our new mouse model we discovered this new class of genes "“microRNA "“ as genetic cause for this clinical picture," explained Dr. Helmut Fuchs, who conceived the idea of this mouse model and who is scientific -technical head of the German Mouse Clinic at Helmholtz Zentrum Mnchen.
The new mouse model is called diminuendo, named after the term in music theory meaning "becoming gradually softer". The mice were bred using the ENU method in which the male mice are administered N-ethyl-N-nitrosurea (ENU), thus influencing the DNA of their sperm. Successor generations develop dominant or recessive mutations. Using methods like these, Martin Hrab© de Angelis and his colleagues in the German Mouse Clinic can thus identify mutants that develop diseases similar to human diseases. They made the diminuendo mouse model available to colleagues of the Wellcome Trust Sanger Institute in Cambridge, UK, who "“ based on specific characterizations "“ ultimately found the association with the miR-96 mutation.
In Germany alone, around 13 million people have impaired hearing, according to estimates of the German Deaf Association (Deutscher Schwerhörigenbund). There are diverse causes for this, including deafness simply due to old age, hearing loss caused by infections and damage due to chronic noise. However, progressive hearing loss can also have genetic causes.
"We assume that our mouse model will be of far-reaching significance for the development of treatment strategies against genetically caused progressive hearing loss in humans," Dr. Fuchs explained. Colleagues from Spain confirm his assumption. They have already performed first examinations on patients diagnosed with progressive hearing loss. In them the microRNA cluster Mirn96 was mutated in the same seed region as in the mouse model. Now, with the aid of this mouse model, the international research consortium hopes to identify factors which are necessary for long-term survival of hair cells and thus to find new approaches for treatment of progressive hearing loss.
Original Publication: Lewis M. et al.: An ENU-induced mutation of miR-96 associated with progressive hearing loss in mice. Nature Genetics online April 12, 2009 http://dx.doi.org/10.1038/ng.369
The German Mouse Clinic is a diagnosis clinic established under the auspices of the National Genome Research Network (NGFN). Here mutant (genetically altered) mice are characterized under standardized conditions, in order to find animal models for genetically caused human diseases and thus to better understand these diseases. Further information...
The Institute of Experimental Genetics of Helmholtz Zentrum Mnchen is concerned with the functional analysis of the genome of mammals. Mouse models are developed to elucidate gene functions, and new investigation methods of genomics, proteomics and bioinformatics are applied. The objective is to elucidate the causes and pathogenic patterns of human diseases. Further information...
Mouse Mutant Archive: Further information...