tokens: Results Through targeted next - generation sequencing of 414 genes known to be associated with deafness , homozygous variants c.536del ( p. Leu180Serfsâˆ—20 ) in TECTA , c.3719 G > A ( p. Arg1240Gln ) in MYO7A , and c.482 + 1986_1988del in HGF were identified as the pathogenic causes of enrolled families .