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Type: Artigo de periódico
Title: Diagnosis Of Alpha-1-antitrypsin Deficiency By Dna Analysis Of Children With Liver Disease.
Author: De Tommaso, A M
Rossi, C L
Escanhoela, C A
Serra, H G
Bertuzzo, C S
Hessel, G
Abstract: Alpha-1-antitrypsin deficiency is a genetic disorder which is transmitted in a co-dominant, autosomal form. Alpha-1-antitrypsin deficiency affects mainly the lungs and the liver leading, in the latter case, to neonatal cholestasis, chronic hepatitis or cirrhosis. A precise diagnosis of Alpha-1-antitrypsin deficiency may be obtained by biochemical or molecular analysis. The purpose of this study was to use DNA analysis to examine the presence of an alpha-1-antitrypsin deficiency in 12 children suspected of having this deficiency and who showed laboratory and clinical characteristics of the disease. Twelve patients, aged 3 months to 19 years, who had serum alpha-1-antitrypsin levels lower than normal and/or had hepatic disease of undefined etiology were studied. The mutant alleles S and Z of the alpha-1-antitrypsin gene were investigated in the 12 children. Alpha-1-antitrypsin gene organization was analyzed by amplification of genome through the polymerase chain reaction and digestion with the restriction enzymes Xmnl (S allele) and Taq-1 (Z allele). Seven of the 12 patients had chronic liver disease of undefined etiology and the other five patients had low serum levels of alpha-1-antitrypsin as well as a diagnosis of neonatal cholestasis and/or chronic liver disease of undefined etiology. Five of the 12 patients were homozygous for the Z allele (ZZ) and two had the S allele with another allele (*S) different from Z. These results show that alpha-1-antitrypsin deficiency is relatively frequent in children with chronic hepatic disease of undefined etiology and/or low alpha-1-antitrypsin levels (41.6%). A correct diagnosis is important for effective clinical follow-up and for genetic counseling.
Subject: Adolescent
Child, Preschool
Gene Amplification
Liver Diseases
Polymerase Chain Reaction
Restriction Mapping
Alpha 1-antitrypsin
Alpha 1-antitrypsin Deficiency
Citation: Arquivos De Gastroenterologia. v. 38, n. 1, p. 63-8
Rights: aberto
Appears in Collections:Unicamp - Artigos e Outros Documentos

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