Background:<br> Usher syndrome (USH) is a genetically heterogeneous deafness-blindness syndrome, divided into three clinical subtypes: USH1, USH2 and USH3.<br> Methods:<br> Mutations in 21 out of 26 investigated Danish unrelated individuals with USH were identified, using a combination of molecular diagnostic methods.<br> Results:<br> Before Next Generation Sequencing (NGS) became available ...