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| | Usher syndrome - Genetics Home Reference |
 | | The signs and symptoms of Usher syndrome vary in their severity and age of onset; most are present from birth or shortly thereafter, while a few begin later in childhood or adolescence. |
 | | Usher syndrome is thought to be responsible for 3 percent to 6 percent of all childhood deafness and about 50 percent of deaf-blindness in adults. |
 | | Mutations in the CDH23, GPR98, MYO7A, PCDH15, USH1C, USH1G, USH2A, and USH3A genes cause Usher syndrome. |
| ghr.nlm.nih.gov /condition=ushersyndrome (836 words) |
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