caa a22 4500 467932905 CHVBK 20180406152948.0 cr unu---uuuuu 170328e20061201xx s 000 0 eng 10.1007/s10545-006-0276-1 doi (NATIONALLICENCE)springer-10.1007/s10545-006-0276-1 Variant maple syrup urine disease (MSUD)—The entire spectrum [Elektronische Daten] [E. Simon, N. Flaschker, P. Schadewaldt, U. Langenbeck, U. Wendel] Summary: Background: In the rare inborn autosomal recessive disorder maple syrup urine disease (MSUD) the accumulation of the branched-chain amino acids (BCAAs) and their metabolic products results in acute and chronic brain dysfunction. About 20% of the patients suffer from non-classic variant forms of MSUD of different clinical severity. Aim: Up to now variant cases have mostly been published as individual case reports; the aim of this study was to give a comparative description of 16 individuals (aged 6-30 years) with different forms of variant MSUD. Methods: Laboratory data, information on clinical course and treatment as well as aspects of developmental, intellectual and social outcome were obtained retrospectively. Data from in vitro and in vivo methods measuring the degree of enzyme deficiency were included. Results: In addition to a mild phenotype, which fits well into the so-called intermittent variant, and a more severe phenotype with a wider range from a mild variant to an almost classic form, which fits well into the so-called intermediate variant, we assume the existence of an asymptomatic, non-disease variant of MSUD. These clinical phenotypes are not unambiguously differentiable on the basis of biochemical parameters. Conclusion: A continuum of clinical severity from asymptomatic to very severe (border to classic) exists in variant MSUD. Apart from newborns with classic MSUD, also those with variant forms benefit from early diagnosis and start of adequate treatment. SSIEM and Springer, 2006 Simon E. Department of General Paediatrics, University Children's Hospital, Heinrich-Heine University, Moorenstr. 5, D-40225, Düsseldorf, Germany aut Flaschker N. Department of General Paediatrics, University Children's Hospital, Heinrich-Heine University, Moorenstr. 5, D-40225, Düsseldorf, Germany aut Schadewaldt P. Department of General Paediatrics, University Children's Hospital, Heinrich-Heine University, Moorenstr. 5, D-40225, Düsseldorf, Germany aut Langenbeck U. Institute of Human Genetics, University Hospital, Frankfurt/Main, Germany aut Wendel U. Department of General Paediatrics, University Children's Hospital, Heinrich-Heine University, Moorenstr. 5, D-40225, Düsseldorf, Germany aut Journal of Inherited Metabolic Disease Kluwer Academic Publishers 29/6(2006-12-01), 716-724 0141-8955 29:6<716 2006 29 10545 https://doi.org/10.1007/s10545-006-0276-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10545-006-0276-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Simon E. Department of General Paediatrics, University Children's Hospital, Heinrich-Heine University, Moorenstr. 5, D-40225, Düsseldorf, Germany aut NATIONALLICENCE 700 1- Flaschker N. Department of General Paediatrics, University Children's Hospital, Heinrich-Heine University, Moorenstr. 5, D-40225, Düsseldorf, Germany aut NATIONALLICENCE 700 1- Schadewaldt P. Department of General Paediatrics, University Children's Hospital, Heinrich-Heine University, Moorenstr. 5, D-40225, Düsseldorf, Germany aut NATIONALLICENCE 700 1- Langenbeck U. Institute of Human Genetics, University Hospital, Frankfurt/Main, Germany aut NATIONALLICENCE 700 1- Wendel U. Department of General Paediatrics, University Children's Hospital, Heinrich-Heine University, Moorenstr. 5, D-40225, Düsseldorf, Germany aut NATIONALLICENCE 773 0- Journal of Inherited Metabolic Disease Kluwer Academic Publishers 29/6(2006-12-01), 716-724 0141-8955 29:6<716 2006 29 10545 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer