International Journal of Pediatric Otorhinolaryngology

Autor: Manzoli, Gabrielle N., Abe Sandes, Kiyoko, Bittles, Alan H., Silva, Danniel S. D. da, Fernandes, Luciene da Cruz, Paulon, Roberta M. C., Castro, Iza Cristina S. de, Padovani, Carla M. C. A., Acosta, Angelina Xavier
Jazyk: angličtina
Rok vydání: 2013
Předmět:
Zdroj: Repositório Institucional da UFBA
Universidade Federal da Bahia (UFBA)
instacron:UFBA
ISSN: 0165-5876
DOI: 10.1016/j.ijporl.2013.04.001
Popis: Texto completo: acesso restrito. p. 1077–1082 Submitted by Suelen Reis (suziy.ellen@gmail.com) on 2014-05-20T16:00:17Z No. of bitstreams: 1 1-s2.0-S0165587613001493-main.pdf: 646586 bytes, checksum: e8f66231c2ea1aa83bca064648526d0f (MD5) Approved for entry into archive by Flávia Ferreira (flaviaccf@yahoo.com.br) on 2014-06-04T16:24:04Z (GMT) No. of bitstreams: 1 1-s2.0-S0165587613001493-main.pdf: 646586 bytes, checksum: e8f66231c2ea1aa83bca064648526d0f (MD5) Made available in DSpace on 2014-06-04T16:24:04Z (GMT). No. of bitstreams: 1 1-s2.0-S0165587613001493-main.pdf: 646586 bytes, checksum: e8f66231c2ea1aa83bca064648526d0f (MD5) Previous issue date: 2013 Objective: There are many hearing impaired individuals in Monte Santo, a rural municipality in the state of Bahia, Brazil, including multiple familial cases strongly suggestive of a genetic aetiology. Methods: The present study investigated 81 subjects with hearing impairment (HI) recruited from 36 families. Mutations often associated with HI, i.e. the DFNB1 mutations c.35delG in GJB2, deletions del(GJB6-D13S1830) and del(GJB6-D13S1854), and A1555G in the mitochondrial gene MTRNR1 were initially analyzed, with additional mutations in GJB2 identified by sequencing the coding region of the gene. Results: Seven different mutations were present in GJB2 with mutations c.35delG and p.Arg75Gln, which are known to be pathogenic, identified in 37.0% of the subjects. Individuals homozygous for the c.35delG mutation were diagnosed in eight families, corresponding to 24.7% of unrelated individuals with nonsyndromic hearing impairment (NSHI), and an additional heterozygote for this mutation was present in a single family. Ten individuals (12.4%) in another family were heterozygous for the mutation p.Arg75Gln. Conclusions: Significant heterogeneity was observed in the alleles and patterns of NSHI inheritance among the subjects studied, probably due to the extensive inter-ethnic admixture that characterizes the peoples of Brazil, together with a high prevalence of community endogamy and consanguineous marriage.
Databáze: OpenAIRE
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