Description : Usher syndrome is an autosomal recessive disorder associated with sensorineural hearing
impairment and progressive visual loss attributable to retinitis pigmentosa. The syndrome
is both clinically and genetically heterogeneous. Of the 3 different clinical types
that have been described, USH1 (276900), consisting of the association of profound
congenital deafness, constant vestibular dysfunction, and prepubertal onset retinitis
pigmentosa, is the most severe.;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the scaffold protein containing ankyrin repeats and SAM domain
gene (SANS, 607696.0001);