Abstract
Usher syndrome is an autosomal recessive disease characterized by dual sensory impairments; affected individuals are born with a sensorineural hearing loss and ultimately lose their sight as retinitis pigmentosa develops. Conventional protein markers previously tested in a Louisiana Acadian kindred suggested tentative linkage to vitamin D-binding protein on chromosome 4. DNA linkage studies do not confirm this linkage relationship and exclude much of chromosome 4 as the site of the Usher syndrome gene in these families.
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