Usher Syndrome, Type Ie
Description
Usher syndrome type I an autosomal recessive disorder characterized by profound congenital hearing impairment with unintelligible speech, early retinitis pigmentosa, and constant vestibular dysfunction (summary by Chaib et al., 1997).
For a discussion of genetic heterogeneity of USH type I, see 276900.
MappingUsing homozygosity mapping in a consanguineous family in Morocco, Chaib et al. (1997) identified a genetically distinct form, which they called USH1E and mapped to 21q21. The delimited 15-cM interval was flanked by D21S1905 and D21S1913.