Families affected with syndromic hereditary hearing loss. Filled symbols indicate individuals affected with hearing loss. Audiograms are representative of the hearing loss in all affected members of each respective family. a. Family 1 showing Mendelian recessive inheritance of severe to profound hearing loss. The audiogram corresponds to proband F1.5. b. Family 2 showing Mendelian recessive inheritance of moderate hearing loss or dominant de novo inheritance in the twins. The audiogram corresponds to proband F2.4. c. Family 3 showing Mendelian dominant inheritance of mild hearing loss. The audiogram corresponds to proband F3.3.