Caracterização molecular da fenilcetonuria em pacientes da região de Campinas / Molecular characterization of phenylketonuria in patients of Campinas region

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Phenylketonuria (PKU) is an autosomal recessive genetic disorder caused by deficiency of the hepatic phenylalanine-4-hydroxylase (PAH), which catalyzes hydroxylation of phenylalanine to tyrosine. Deficiency of PAH is caused by mutations in the PAH gene, resulting in high serum levels of phenylalanine and mental retardation. Restriction of phenylalanine intake prevents neurological impairments of PKU. Mutation screening of PAH gene is a very useful strategy for accurate diagnosis, newborn phenotype prediction and to implement a dietary without phenylalanine. To date, almost 500 mutations have been identified in the PAH gene. The PAH mutation frequency could change with the studied population. The Brazilian population is compound by a great ethnic variation and the PAH mutation frequency could be very different depending on witch Brazilian region was studied. Previous studies in Brazilian patients were performed at São Paulo (SP), Rio Grande do Sul (RS) and Minas Gerais (MG) and the mutation frequency can be changed according to the population studied. The aim of this work was to analyze the most frequent PAH mutations previously described in other populations and determine the PKU molecular characterization in patients identified in the neonatal service of the Regional Newborn Screening Service/Campinas. The V388M, IVS10nt11, IVS12nt1 and R408W mutations were analyzed by PCR and RFLP. In addition, DHPLC and automatic sequencing were performed for patients whose initial screening was negative. Any of the R408W, IVS10-11G?A, IVS12+1G?A and V388M mutations was found in great frequency in our sample from Campinas region. The other mutations that could be detected in this sample were diversified. The genetic characteristics in these patients were different than others Brazilian populations.

ASSUNTO(S)

reação em cadeia de polimerase fenilcetonuria molecular biology genotipo biologia molecular polymerase chain reaction neonatal screening genotype triagem neonatal phenylketonuria

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