Open AccessAutosomal recessive nonsyndromic hearing impairment in two Finnish families due to the population enriched CABP2 c.637+1G>T variant
Author(s) -
Bharadwaj Thashi,
Schrauwen Isabelle,
Acharya Anushree,
NouelSaied Liz M.,
Väisänen MarjaLeena,
Kraatari Minna,
Rahikkala Elisa,
Jarvela Irma,
Kotimäki Jouko,
Leal Suzanne M.
Publication year - 2022
Publication title -
molecular genetics and genomic medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 29
ISSN - 2324-9269
DOI - 10.1002/mgg3.1866
Subject(s) - exome sequencing , genetics , hearing loss , exome , splice , population , biology , medicine , audiology , gene , mutation , environmental health
Background The genetic architecture of hearing impairment in Finland is largely unknown. Here, we investigated two Finnish families with autosomal recessive nonsyndromic symmetrical moderate‐to‐severe hearing impairment. Methods Exome and custom capture next‐generation sequencing were used to detect the underlying cause of hearing impairment. Results In both Finnish families, we identified a homozygous pathogenic splice site variant c.637+1G>T in CAPB2 that is known to cause autosomal recessive nonsyndromic hearing impairment. Four CABP2 variants have been reported to underlie autosomal recessive nonsyndromic hearing impairment in eight families from Iran, Turkey, Pakistan, Italy, and Denmark. Of these variants, the pathogenic splice site variant c.637+1G>T is the most prevalent. The c.637+1G>T variant is enriched in the Finnish population, which has undergone multiple bottlenecks that can lead to the higher frequency of certain variants including those involved in disease. Conclusion We report two Finnish families with hearing impairment due to the CABP2 splice site variant c.637+1G>T.