X-linked nonsyndromic deafness X-linked deafness 3 MIM:300030 DOID:0111736 An X-linked nonsyndromic deafness characterized by congenital, bilateral, profound and sensorineural hearing loss in males and bilateral, mild to moderate high frequency sensorineural hearing impairment with later onset in heterozygous females that has_material_basis_in mutation in a region on chromosome Xp21.2. DFN4 DFNX3 congenital sensorineural X-linked deafness 4 disease_ontology