Further evidence of involvement of TMEM132E in autosomal recessive nonsyndromic hearing impairment.

Autosomal-recessive (AR) nonsyndromic hearing impairment (NSHI) displays a high degree of genetic heterogeneity with >100 genes identified. Recently, TMEM132E, which is highly expressed in inner hair cells, was suggested as a novel gene for DFNB99. A missense variant c.1259G>A: p.(Arg420Gln) in TMEM132E was identified that segregated with Aduanyu1668HI in a single Chinese family with two affected members. In the present study, a family of Pakistani origin with prelingual profound sensorineural hearing impairment displaying AR mode of inheritance was investigated via exome and Sanger sequencing. Compound heterozygous variants c.382G>T: p.(Ala128Ser) and c.2204C>T: p.(Pro735Leu) in TMEM132E were observed in affected but not in unaffected family members. TMEM132E variants identified in this and the previously reported Aduanyu1668HI family are located in the extracellular domain. In conclusion, we present a second Aduanyu1668HI family with TMEM132E variants which strengthens the evidence of the involvement of this gene in the etiology of

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