Novel loss-of-function mutations in COCH cause autosomal recessive nonsyndromic hearing loss.

Abstract:

:COCH is the most abundantly expressed gene in the cochlea. Unsurprisingly, mutations in COCH underly hearing loss in mice and humans. Two forms of hearing loss are linked to mutations in COCH, the well-established autosomal dominant nonsyndromic hearing loss, with or without vestibular dysfunction (DFNA9) via a gain-of-function/dominant-negative mechanism, and more recently autosomal recessive nonsyndromic hearing loss (DFNB110) via nonsense variants. Using a combination of targeted gene panels, exome sequencing, and functional studies, we identified four novel pathogenic variants (two nonsense variants, one missense, and one inframe deletion) in COCH as the cause of autosomal recessive hearing loss in a multi-ethnic cohort. To investigate whether the non-truncating variants exert their effect via a loss-of-function mechanism, we used minigene splicing assays. Our data showed both the missense and inframe deletion variants altered RNA splicing by creating an exon splicing silencer and abolishing an exon splicing enhancer, respectively. Both variants create frameshifts and are predicted to result in a null allele. This study confirms the involvement of loss-of-function mutations in COCH in autosomal recessive nonsyndromic hearing loss, expands the mutational landscape of DFNB110 to include coding variants that alter RNA splicing, and highlights the need to investigate the effect of coding variants on RNA splicing.

journal_name

Hum Genet

journal_title

Human genetics

authors

Booth KT,Ghaffar A,Rashid M,Hovey LT,Hussain M,Frees K,Renkes EM,Nishimura CJ,Shahzad M,Smith RJ,Ahmed Z,Azaiez H,Riazuddin S

doi

10.1007/s00439-020-02197-5

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

1565-1574

issue

12

eissn

0340-6717

issn

1432-1203

pii

10.1007/s00439-020-02197-5

journal_volume

139

pub_type

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