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001-es BibID:	BIBFORM040456
Első szerző:	Snoeckx, Rikkert L
Cím:	GJB2 Mutations and Degree of Hearing Loss : a Multicenter Study / Snoeckx R. L., Huygen P. L. M., Feldmann D., Marlin S., Denoyelle F., Waligora J., Mueller-Malesinska M., Pollak A., Ploski R., Murgia A., Orzan E., Castorina P., Ambrosetti U., Nowakowska-Szyrwinska E., Bal J., Wiszniewski W., Janecke A. R., Nekahm-Heis D., Seeman P., Bendova O., Kenna M. A., Frangulov A., Rehm H. L., Tekin M., Incesulu A., Dahl H. H. M., du Sart D., Jenkins L., Lucas D., Bitner-Glindzicz M., Avraham K. B., Brownstein Z., del Castillo I., Moreno F., Blin N., Pfister M., Sziklai I., Toth T., Kelley P. M., Cohn E. S., Van Maldergem L., Hilbert P., Roux A. F., Mondain M., Hoefsloot L. H., Cremers C. W., Löppönen T., Löppönen H., Parving A., Gronskov K., Schrijver I., Roberson J., Gualandi F., Martini A., Lina-Granade G., Pallares-Ruiz N., Correia C., Fialho G., Cryns K., Hilgert N., Van de Heyning P., Nishimura C. J., Smith R. J., Van Camp G.
Dátum:	2005
ISSN:	0002-9297
Megjegyzések:	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(GJB6-D13S1830) (median 108 dB)--had significantly more-severe HI than that of 35delG homozygotes.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	American Journal Of Human Genetics. - 77 : 6 (2005), p. 945-957. -
További szerzők:	Huygen, Patrick L. M. Feldmann, Delphine Marlin, Sandrine Denoyelle, Francoise Waligora, Jaroslaw Mueller-Malesinska, Malgorzata Pollak, Agnieszka Ploski, Rafal Murgia, Alessandra Orzan, Eva Castorina, Pierangela Ambrosetti, Umberto Nowakowska-Szyrwinska, Ewa Bal, Jerzy Wiszniewski, Wojciech Janecke, Andreas Nekahm-Heis, Doris Seeman, Pavel Bendova, Olga Kenna, Margaret A. Frangulov, Anna Rehm, Heidi L. Tekin, Mustafa Incesulu, Armagan Dahl, Hans-Henrik M. du Sart, Desirée Jenkins, Lucy Lucas, Deirdre Bitner-Glindzicz, Maria Avraham, Karen B. Brownstein, Zippora Del Castillo, Ignacio Moreno, Felipe Blin, Nikolaus Pfister, Markus Sziklai István (1954-) (fül-orr-gégész) Tóth Tímea (1974-) (fül-orr-gégész) Kelley, Philip M. Cohn, Edward S. Van Maldergem, Lionel Hilbert, Pascale Roux, Anne-Francoise Mondain, Michel Hoefsloot, Lies H. Cremers, Cor W.R.J. Löppönen, Tuija Löppönen, Heikki Parving, Agnete Gronskov, Karen Schrijver, Iris Roberson, Joseph Gualandi, Francesca Martini, Alessandro Lina-Granade, Geneviéve Pallares-Ruiz, Nathalie Correia, Céu Fialho, Graca Cryns, Kim Hilgert, Nele Heyning, Paul, van de Nishimura, Carla J. Smith, Richard J. Camp, Guy, Van
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