TY  - JOUR
A1  - Vona, Barbara
A1  - Mazaheri, Neda
A1  - Lin, Sheng-Jia
A1  - Dunbar, Lucy A.
A1  - Maroofian, Reza
A1  - Azaiez, Hela
A1  - Booth, Kevin T.
A1  - Vitry, Sandrine
A1  - Rad, Aboulfazl
A1  - Rüschendorf, Franz
A1  - Varshney, Pratishtha
A1  - Fowler, Ben
A1  - Beetz, Christian
A1  - Alagramam, Kumar N.
A1  - Murphy, David
A1  - Shariati, Gholamreza
A1  - Sedaghat, Alireza
A1  - Houlden, Henry
A1  - Petree, Cassidy
A1  - VijayKumar, Shruthi
A1  - Smith, Richard J. H.
A1  - Haaf, Thomas
A1  - El-Amraoui, Aziz
A1  - Bowl, Michael R.
A1  - Varshney, Gaurav K.
A1  - Galehdari, Hamid
T1  - A biallelic variant in CLRN2 causes non-syndromic hearing loss in humans
JF  - Human Genetics
N2  - Deafness, the most frequent sensory deficit in humans, is extremely heterogeneous with hundreds of genes involved. Clinical and genetic analyses of an extended consanguineous family with pre-lingual, moderate-to-profound autosomal recessive sensorineural hearing loss, allowed us to identify CLRN2, encoding a tetraspan protein, as a new deafness gene. Homozygosity mapping followed by exome sequencing identified a 14.96 Mb locus on chromosome 4p15.32p15.1 containing a likely pathogenic missense variant in CLRN2 (c.494C > A, NM_001079827.2) segregating with the disease. Using in vitro RNA splicing analysis, we show that the CLRN2 c.494C > A variant leads to two events: (1) the substitution of a highly conserved threonine (uncharged amino acid) to lysine (charged amino acid) at position 165, p.(Thr165Lys), and (2) aberrant splicing, with the retention of intron 2 resulting in a stop codon after 26 additional amino acids, p.(Gly146Lysfs*26). Expression studies and phenotyping of newly produced zebrafish and mouse models deficient for clarin 2 further confirm that clarin 2, expressed in the inner ear hair cells, is essential for normal organization and maintenance of the auditory hair bundles, and for hearing function. Together, our findings identify CLRN2 as a new deafness gene, which will impact future diagnosis and treatment for deaf patients.
KW  - deafness
KW  - CLRN2
KW  - gene
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-267740
SN  - 1432-1203
VL  - 140
IS  - 6
ER  -