CATSPER2 and hearing loss disorder: In addition, we performed Multiplex Ligation-dependent Probe Amplification (MLPA) analysis to determine the deletion range including the PPIP5K1, CKMT1B, STRC and CATSPER2 genomic regions to estimate the prevalence of the STRC-CATSPER deletion, which is causative for DIS among STRC-associated hearing loss patients.