Using sgRNA (targeting GCACGATGAAGACGTACCTG) and an ssODN template with CRISPR/Cas9 technology, valine codon 61 (GTC) in exon 2 was changed to leucine (CTC) (c.181G>C, p.V61L). This mutation mimics the human p.V60L mutation associated with a form of dominant early-onset progressive sensorineural hearing loss (DFNA41).