Data/hora: 02/06/2024 05:02:56

Provedor de dados: 	56	
País: 	Brazil	
Título: 	Prevalence of the A1555G (12S rRNA) and tRNA Ser(UCN) mitochondrial mutations in hearing-impaired Brazilian patients	
Autores: 	Abreu-Silva,R.S.; Lezirovitz,K.; Braga,M.C.C.; Spinelli,M.; Pirana,S.; Della-Rosa,V.A.; Otto,P.A.; Mingroni-Netto,R.C.	
Data: 	2006-02-01	
Ano: 	2006	
Palavras-chave: 	Mitochondrial DNA; Hearing impairment; A1555G mutation; TRNA Ser(UCN) mutations; European- and African- Brazilian patients.	
Resumo: 	Mitochondrial mutations are responsible for at least 1% of the cases of hereditary deafness, but the contribution of each mutation has not yet been defined in African-derived or native American genetic backgrounds. A total of 203 unselected hearing-impaired patients were screened for the presence of the mitochondrial mutation A1555G in the 12S rRNA gene and mutations in the tRNA Ser(UCN) gene in order to assess their frequency in the ethnically admixed Brazilian population. We found four individuals with A1555G mutation (2%), which is a frequency similar to those reported for European-derived populations in unselected samples. On the other hand, complete sequencing of the tRNA Ser(UCN) did not reveal reported pathogenic substitutions, namely A7445G, 7472insC, T7510C, or T7511C. Instead, other rare substitutions were found such as T1291C, A7569G, and G7444A. To evaluate the significance of these findings, 110 "European-Brazilians" and 190 "African-Brazilians" unrelated hearing controls were screened. The T1291C, A7569G and G7444A substitutions were each found in about 1% (2/190) of individuals of African ancestry, suggesting that they are probably polymorphic. Our results indicate that screening for the A1555G mutation is recommended among all Brazilian deaf patients, while testing for mutations in the tRNA Ser(UCN) gene should be considered only when other frequent deafness-causing mutations have been excluded or in the presence of a maternal transmission pattern.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000200008	
Editor: 	Associação Brasileira de Divulgação Científica	
Relação: 	10.1590/S0100-879X2006000200008	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Medical and Biological Research  v.39 n.2 2006	
Fonte: 	info:eu-repo/semantics/openAccess