Six novel β-galactosidase gene mutations in Brazilian patients with GM1-gangliosidosis
Cláudia M.D. Silva
Medical Genetics Service Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
Search for more papers by this authorMárcia H. Severini
Medical Genetics Service Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
Search for more papers by this authorAndréia Sopelsa
Medical Genetics Service Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
Search for more papers by this authorJanice C. Coelho
Medical Genetics Service Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
Search for more papers by this authorArnaldo Zaha
Center of Biotechnology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
Search for more papers by this authorAlessandra d'Azzo
Department of Genetics, St. Jude Children's Research Hospital, Memphis, Tennessee
Search for more papers by this authorCorresponding Author
Roberto Giugliani
Medical Genetics Service Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
Serviço de Genética Médica, Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos, 2350, Porto Alegre, RS, Brazil, 90035-003; Fax 55 51 316 8010Search for more papers by this authorCláudia M.D. Silva
Medical Genetics Service Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
Search for more papers by this authorMárcia H. Severini
Medical Genetics Service Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
Search for more papers by this authorAndréia Sopelsa
Medical Genetics Service Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
Search for more papers by this authorJanice C. Coelho
Medical Genetics Service Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
Search for more papers by this authorArnaldo Zaha
Center of Biotechnology, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
Search for more papers by this authorAlessandra d'Azzo
Department of Genetics, St. Jude Children's Research Hospital, Memphis, Tennessee
Search for more papers by this authorCorresponding Author
Roberto Giugliani
Medical Genetics Service Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
Serviço de Genética Médica, Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos, 2350, Porto Alegre, RS, Brazil, 90035-003; Fax 55 51 316 8010Search for more papers by this authorAbstract
GM1-gangliosidosis is a lysosomal storage disease caused by a deficiency of acid β-galactosidase. Three clinical forms are recognized—infantile, juvenile, and adult—based on age of onset and severity of the symptoms. We have performed molecular analysis of a large cohort of GM1 patients (19 Brazilian and one Uruguayan), using nonradioactive single-strand conformation polymorphism (SSCP) and restriction enzyme analysis of genomic DNA. Six novel mutations (R121S, V240M, D491N, 638–641insT, 895–896insC, 1622–1627insG) and two previously described point mutations (R59H, R208C) were identified. Together they accounted for 90% of the disease alleles of the patients. Two mutations, 1622–1627insG and R59H, were present in 18 of 20 patients. In addition, four polymorphisms (L10P, L12L, R521C, S532G) were identified. All cases reported are infantile GM1 gangliosidosis. This report constitutes the most comprehensive molecular study to date of this disorder in infantile patients. Since GM1-gangliosidosis is the most common lysosomal storage disorder in Southern Brazil, molecular diagnosis will be important for genetic counseling, carrier detection and prenatal diagnosis in index families. Hum Mutat 13:401–409, 1999. © 1999 Wiley-Liss, Inc.
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