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The most common cause of nonsyndromic autosomal recessive hearing loss is mutations in  GJB2 . The mutation spectrum and prevalence of mutations vary significantly among ethnic groups, and the relationship between p.V37I mutation in  GJB2  and the hearing phenotype is controversial. Among the 3,864 patients in this study, 106 (2.74%) had a homozygous p.V37I variation or a compound p.V37I plus other  GJB2  pathogenic mutation, a frequency that was significantly higher than that in the control group (600 individuals, 0%). The hearing loss phenotype ranged from mild to profound in all patients with the homozygous p.V37I variation or compound p.V37I plus other  GJB2  pathogenic mutation. There was no difference in the distribution of the hearing level in the group with the homozygous p.V37I variation and the group with the compound p.V37I variation plus pathogenic mutation. Most patients (66.04%) with the V37I-homozygous variation or p.V37I plus other pathogenic mutation had a mild or moderate hearing level. This study found a definite relationship between p.V37I and deafness, and most patients who carried the pathogenic combination with p.V37I mutation had mild or moderate hearing loss. Therefore, otolaryngologists should consider that the milder phenotype might be caused by the  GJB2  p.V37I mutation.

The Relationship between the p.V37I Mutation in GJB2 and Hearing Phenotypes in Chinese Individuals