maple syrup urine disease/tyrosine

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The need of essential amino acids in children. An evaluation based on the intake of phenylalanine, tyrosine, leucine, isoleucine, and valine in children with phenylketonuria, tyrosine amino transferase defect, and maple syrup urine disease.

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The diet of children with blocks in the metabolism of five amino acids has been investigated to evaluate the need for these amino acids in the maintenance of normal growth and development. Two children with phenylketonuria, one child with tyrosine aminotransferase defect and one child with maple

Neonatal screening in Italy for congenital hypothyroidism and metabolic disorders: hyperphenylalaninemia, maple syrup urine disease and homocystinuria.

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A multiple screening program to establish the frequency of congenital hypothyroidism (CH), phenylketonuria (PKU), maple syrup urine disease (MSUD), homocystinuria and hypertyrosinemia in endemic and sporadic goitrous regions of Italy is being carried out. Valine, methionine, leucine, isoleucine,

Determination of branched chain amino acids, methionine, phenylalanine, tyrosine and alpha-keto acids in plasma and dried blood samples using HPLC with fluorescence detection.

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BACKGROUND The determination of branched chain amino acids [BCAA; valine (Val), leucine (Leu), isoleucine (Ile)], alpha-keto acids derived from BCAA [BCKA; alpha-ketoisovaleric acid (KIV), alpha-ketoisocaproic acid (KIC), alpha-ketomethylvaleric acid (KMV)], methionine (Met), phenylalanine (Phe) and

Urinary biomarkers of oxidative damage in Maple syrup urine disease: the L-carnitine role.

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Maple syrup urine disease (MSUD) is a disorder of branched-chain amino acids (BCAA). The defect in the branched-chain α-keto acid dehydrogenase complex activity leads to an accumulation of these compounds and their corresponding α-keto-acids and α-hydroxy-acids. Studies have shown that oxidative

Maple syrup urine disease in Mennonites. Evidence that the Y393N mutation in E1 alpha impedes assembly of the E1 component of branched-chain alpha-keto acid dehydrogenase complex.

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Maple Syrup Urine Disease (MSUD) in Mennonites is associated with homozygosity for a T to A transversion in the E1 alpha gene of the branched-chain alpha-keto acid dehydrogenase complex. This causes a tyrosine to asparagine substitution at position 393 (Y393N). To assess the functional significance

Evidence for both a regulatory mutation and a structural mutation in a family with maple syrup urine disease.

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Maple syrup urine disease (MSUD) results from a deficiency of branched chain alpha-ketoacid dehydrogenase (BCKDH). We have studied the etiology of MSUD by determining the enzyme activity, protein, and mRNA levels of BCKDH in fibroblasts from a classic MSUD patient and his parents. By enzymatic

A chemically-induced acute model of maple syrup urine disease in rats for neurochemical studies.

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We report a chemically-induced model of maple syrup urine disease (MSUD) in 10- and 30-day-old rats produced by subcutaneous administration of a branched-chain amino acids (BCAA) pool along with the analyses of plasma and brain amino acid levels by HPLC at 0-120 min after administration. We observed

Evidence of common ancestry for the maple syrup urine disease (MSUD) Y438N allele in non-Mennonite MSUD patients.

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Maple syrup urine disease (MSUD) is a rare (1/185,000) autosomal recessive inborn error of branched-chain amino acid metabolism characterized by increased plasma leucine, isoleucine, and valine levels. Though, genetically heterogeneous in the worldwide population, MSUD in Old Order Mennonites

Reduction of large neutral amino acid concentrations in plasma and CSF of patients with maple syrup urine disease during crises.

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Neurological dysfunction is common in patients with maple syrup urine disease (MSUD). However, the mechanisms underlying the neuropathology of this disorder are poorly understood. We determined the concentrations of all amino acids in plasma of patients with MSUD during crises (with severe CNS

Large neutral amino acids auto exchange when infused by microdialysis into the rat brain: implication for maple syrup urine disease and phenylketonuria.

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Maple syrup urine disease (MSUD) and phenylketonuria (PKU) are associated with accumulation of large neutral amino acids (LNAA) in blood and tissues and a decrease of other LNAA not directly related to the enzyme defects. One characteristic shared by both the elevated and decreased amino acids is

Two new mutations in the human E1 beta subunit of branched chain alpha-ketoacid dehydrogenase associated with maple syrup urine disease.

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Maple syrup urine disease (MSUD) is an autosomal recessive disorder caused by defective function of the mitochondrial branched chain alpha-ketoacid dehydrogenase (BCKD) complex. Mutations in both alleles of any of three genes for component proteins result in the clinical phenotype. Two discrete

DNA carrier testing and newborn screening for maple syrup urine disease in Old Order Mennonite communities.

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Maple syrup urine disease (MSUD) is an inherited metabolic disorder caused by mutations in the branched chain alpha-keto acid dehydrogenase complex. Worldwide incidence of MSUD is 1:225,000 live births. However, within Old Order Mennonite communities, the incidence is 1:150 live births and results

Gene analysis of Mennonite maple syrup urine disease kindred using primer-specified restriction map modification.

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Maple syrup urine disease (MSUD) is an autosomal recessive inherited disease due to a deficiency of any of the subunits, E1 alpha, E1 beta or E2, of the branched-chain alpha-ketoacid dehydrogenase complex (BCKDH). A large Mennonite kindred of MSUD has been studied in Pennsylvania, USA. In the

Occurrence of a Tyr393----Asn (Y393N) mutation in the E1 alpha gene of the branched-chain alpha-keto acid dehydrogenase complex in maple syrup urine disease patients from a Mennonite population.

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Maple syrup urine disease (MSUD) is caused by a deficiency in the mitochondrial branched-chain alpha-keto acid dehydrogenase complex. The incidence of MSUD in the Philadelphia Mennonites is 1/176 births resulting from consanguinity. In this study, we amplified cDNAs for the decarboxylase E1 alpha

Case report: Aqueous and Vitreous amino-acid concentrations in a patient with maple syrup urine disease operated on rhegmatogenous retinal detachment.

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BACKGROUND Maple syrup urine disease (MSUD) is a rare metabolic disorder, affecting the metabolism of branched chain amino-acids (Valine, Leukine, Isoleukine). We present a rare case of rhegmatogenous retinal detachment (RRD) in a MSUD patient. METHODS We performed amino acid analysis of aqueous

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