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 ARNSHI gene for DFNB99. A missense variant c.1259G>A: p.(Arg420Gln) in TMEM132E was identified that segregated with ARNSHI 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 ARNSHI family are located in the extracellular domain. In conclusion, we present a second ARNSHI family with TMEM132E variants which strengthens the evidence of the involvement of this gene in the etiology of ARNSHI.
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We thank the family members for participating in this study. This work was supported by the Higher Education Commission of Pakistan (to WA) and National Institutes of Health (NIH)-National Institute of Deafness and other Disorders grants R01 DC011651 and R01 DC003594 (to SML).
This work was supported by the Higher Education Commission of Pakistan (to WA) and National Institutes of Health (NIH)-National Institute of Deafness and other Communication Disorders grants R01 DC011651 and R01 DC003594 (to SML).
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The authors declare that they have no conflict of interest.
Members of the DEM4877 family provided written informed consents for the proposed study.
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Liaqat, K., Hussain, S., Bilal, M. et al. Further evidence of involvement of TMEM132E in autosomal recessive nonsyndromic hearing impairment. J Hum Genet 65, 187–192 (2020). https://doi.org/10.1038/s10038-019-0691-4