Background: Hearing loss/deafness is a common otological disorder found in the Pakistani population due to the high prevalence of consanguineous unions, but the full range of genetic causes is still unknown.
Methods: A large consanguineous Pakistani kindred with hearing loss was studied. Whole-exome sequencing and Sanger sequencing were performed to search for the candidate gene underlying the disease phenotype. A minigene assay and reverse transcription polymerase chain reaction was used to assess the effect of splicing variants.
Results: The splicing variants of OTOF (NM_194248, c.3289-1G>T) cosegregated with the disease phenotype in this Pakistani family. The substitution of a single base pair causes the deletion of 10 bp (splicing variant 1) or 13 bp (splicing variant 2) from exon 27, which results in truncated proteins of 1141 and 1140 amino acids, respectively.
Conclusion: Our findings reveal an OTOF splice-site variant as pathogenic for profound hearing loss in this family.
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