GJB2 mutations and degree of hearing loss: A multicenter study

Rikkert L. Snoeckx, Patrick L.M. Huygen, Delphine Feldmann, Sandrine Marlin, Françoise Denoyelle, Jaroslaw Waligora, Malgorzata Mueller-Malesinska, Agneszka Pollak, Rafal Ploski, Alessandra Murgia, Eva Orzan, Pierangela Castorina, Umberto Ambrosetti, Ewa Nowakowska-Szyrwinska, Jerzy Bal, Wojciech Wiszniewski, Andreas R. Janecke, Doris Nekahm-Heis, Pavel Seeman, Olga BendovaMargaret A. Kenna, Anna Frangulov, Heidi L. Rehm, Mustafa Tekin, Armagan Incesulu, Hans Henrik M. Dahl, Desirée Du Sart, Lucy Jenkins, Deirdre Lucas, Maria Bitner-Glindzicz, Karen B. Avraham, Zippora Brownstein, Ignacio Del Castillo, Felipe Moreno, Nikolaus Blin, Markus Pfister, Istvan Sziklai, Timea Toth, Philip M. Kelley, Edward S. Cohn, Lionel Van Maldergem, Pascale Hilbert, Anne Françoise Roux, Michel Mondain, Lies H. Hoefsloot, Cor W.R.J. Cremers, Tuija Löppönen, Heikki Löppönen, Agnete Parving, Karen Gronskov, Iris Schrijver, Joseph Roberson, Francesca Gualandi, Alessandro Martini, Geneviève Lina-Granade, Nathalie Pallares-Ruiz, Céu Correia, Graça Fialho, Kim Cryns, Nele Hilgert, Paul Van De Heyning, Carla J. Nishimura, Richard J.H. Smith, Guy Van Camp*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

444 Scopus citations

Abstract

Hearing impairment (HI) affects 1 in 650 newborns, which makes it the most common congenital sensory impairment. Despite extraordinary genetic heterogeneity, mutations in one gene, GJB2, which encodes the connexin 26 protein and is involved in inner ear homeostasis, are found in up to 50% of patients with autosomal recessive nonsyndromic hearing loss. Because of the high frequency of GJB2 mutations, mutation analysis of this gene is widely available as a diagnostic test. In this study, we assessed the association between genotype and degree of hearing loss in persons with HI and biallelic GJB2 mutations. We performed cross-sectional analyses of GJB2 genotype and audiometric data from 1,531 persons, from 16 different countries, with autosomal recessive, mild-to-profound nonsyndromic HI. The median age of all participants was 8 years; 90% of persons were within the age range of 0-26 years. Of the 83 different mutations identified, 47 were classified as nontruncating, and 36 as truncating. A total of 153 different genotypes were found, of which 56 were homozygous truncating (T/T), 30 were homozygous nontruncating (NT/NT), and 67 were compound heterozygous truncating/nontruncating (T/NT). The degree of HI associated with biallelic truncating mutations was significantly more severe than the HI associated with biallelic nontruncating mutations (P < .0001). The HI of 48 different genotypes was less severe than that of 35delG homozygotes. Several common mutations (M34T, V37I, and L90P) were associated with mild-to-moderate HI (median 25-40 dB). Two genotypes-35delG/R143W (median 105 dB) and 35delG/dela(G/B6-D13S1830) (median 108 dB)-had significantly more-severe HI than that of 35delG homozygotes.

Original languageEnglish
Pages (from-to)945-957
Number of pages13
JournalAmerican Journal of Human Genetics
Volume77
Issue number6
DOIs
StatePublished - Dec 2005

Funding

FundersFunder number
Fondo de Investigaciones SanitariasFIS PI020807, FIS G03/203
G. Passe & R. Williams FoundationDC005248
NIDOCDR01-DC02842
Polish State Committee for Scientific Research3P05A15024
Vlaams Fonds voor Wetenschappelijk Onderzoek
National Institutes of Health
National Institute on Deafness and Other Communication DisordersR01DC002842
Belgian Federal Science Policy Office
Ministerstvo Zdravotnictví Ceské RepublikyIGA MH CR NM 7417-3
Türkiye Bilimler AkademisiMT/TUBA-GEBIP/2001-2-19
Ministry of Science and Technology, Israel
Universiteit Antwerpen

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