Abstract:
:DNA sequence analyses have become a major component in the diagnostic work-up of patients; however, limited consideration appears to be given to the possibility that reported results may in fact be wrong. Over the last four years we have carried out an External Quality Assessment scheme for mutation analysis in phenylketonuria. Each year, three DNA samples with previously characterized genotypes were mailed to participating laboratories. Indications for testing were either confirmation of diagnosis and prediction of disease severity, or carrier analysis. Each year there were several laboratories that failed to identify mutations because of methodological limitations. Of the participating laboratories that used comprehensive mutation detection methods, each year there was at least one that missed at least one mutation. Indeed, in the 2007 scheme almost 8% of reports from laboratories that used comprehensive mutation detection methods such as sequencing of all exons of the PAH gene contained incorrect genotypes. There were also serious deficiencies in the interpretation of genotype data: in the 2007 scheme, 6 out of 10 laboratories that obtained full genotyping marks for interpretation incurred a reduction of marks because information on the expected phenotype was missing or wrong. Several laboratories failed to appreciate the clinical relevance of a mutation associated with mild hyperphenylalaninaemia, which does not require treatment, and some discussed the option of prenatal diagnosis in the respective case. In conclusion, mutation analyses may be prone to errors and this demands careful interpretation of results in relation to clinical and biochemical findings.
journal_name
J Inherit Metab Disjournal_title
Journal of inherited metabolic diseaseauthors
Zschocke J,Aulehla-Scholz C,Patton Sdoi
10.1007/s10545-008-1052-1subject
Has Abstractpub_date
2008-12-01 00:00:00pages
697-702issue
6eissn
0141-8955issn
1573-2665journal_volume
31pub_type
杂志文章abstract::In mammals, dosage compensation for X-linked genes between males and females is achieved by the inactivation of one of the X chromosomes in females. The inactivation event occurs early in development in all cells of the female mouse embryo and is stable and heritable in somatic cells. However, in the primordial germ c...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
doi:10.1007/BF01799608
更新日期:1992-01-01 00:00:00
abstract::Recently a striking elevation of the activity of chitotriosidase, an endo beta-glucosaminidase distinct from lysozyme, was found in plasma from patients with Gaucher type I disease (McKusick 230800). Plasma chitotriosidase originates from activated macrophages and this elevation is secondary to the basic defect in Gau...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF02436762
更新日期:1995-01-01 00:00:00
abstract:BACKGROUND:The cobalamin E (cblE) (MTRR, methionine synthase reductase) and cobalamin G (cblG) (MTR, methionine synthase) defects are rare inborn errors of cobalamin metabolism leading to impairment of the remethylation of homocysteine to methionine. METHODS:Information on clinical and laboratory data at initial full ...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-014-9803-7
更新日期:2015-09-01 00:00:00
abstract::L-2-hydroxyglutaric aciduria (L-2-HGA) is a metabolic disease with an autosomal recessive mode of inheritance. It was first reported in 1980. Patients with this disease have mutations in both alleles of the L2HDGH gene. The clinical presentation of individuals with L-2-HGA is somewhat variable, but affected individual...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,多中心研究
doi:10.1007/s10545-008-0855-4
更新日期:2008-12-01 00:00:00
abstract::S-Adenosylhomocysteine (S-AdoHcy) hydrolase activity in a lymphoblastoid cell line from a patient with adenosine deaminase deficiency disease (ADA(-)LCL) was found to be approximately 60% of that in ADA (+)lymphoblastoid cell lines. S-AdoHcy hydrolase of ADA(-)LCL was more sensitive to inhibition by 2'-deoxyadenosine ...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF02263651
更新日期:1981-01-01 00:00:00
abstract::This study reports three novel mutations of the methionine adenosyltransferase (MAT) lA gene and confirms that hyperhomocysteinaemia may be a characteristic finding in MAT I/III deficiency. Thus, MAT I/III deficiency is important in the differential diagnoses of hyperhomocysteinaemia, which may lead to clinical compli...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-005-4497-5
更新日期:2005-01-01 00:00:00
abstract::Congenital disorders of glycosylation (CDG) are one group among the disorders of glycosylation. The latter comprise defects associated with hypoglycosylation but also defects with hyperglycosylation. Genetic diseases with hypoglycosylation can be divided in primary congenital disorders of glycosylation (CDG) and in ge...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
doi:10.1007/s10545-017-0050-6
更新日期:2017-07-01 00:00:00
abstract:BACKGROUND:Variations in the gene ACADS, encoding the mitochondrial protein short-chain acyl CoA-dehydrogenase (SCAD), have been observed in individuals with clinical symptoms. The phenotype of SCAD deficiency (SCADD) is very heterogeneous, ranging from asymptomatic to severe, without a clear genotype-phenotype correla...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-010-9255-7
更新日期:2011-04-01 00:00:00
abstract:BACKGROUND:A number of studies have already investigated the prevalence of Fabry disease (FD) in adult patients with unexplained left ventricular hypertrophy (LVH) with rates varying from 0 % up to 12 % reflecting referral and gender bias as well as differences in diagnostic methodology. We aimed to perform a prospecti...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-013-9659-2
更新日期:2014-05-01 00:00:00
abstract::We report the case of a boy with 5,10-methylenetetrahydrofolate reductase deficiency. The clinical features consisted of severe mental retardation, spasticity and seizures remaining static to 7 years of age followed by a phase of rapid deterioration and death at 7 1/2 years of age. The main biochemical findings were h...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF01801662
更新日期:1985-01-01 00:00:00
abstract::In many European countries neonatal screening has been introduced over the last 50 years as an important public health programme. Depending on health care structure, available funds, local politics, input from professional groups, parent groups, and the general public this introduction has led to different approaches ...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-012-9483-0
更新日期:2012-07-01 00:00:00
abstract::By using ion-exchange chromatography and gas chromatography coupled with mass spectrometry, the content of phenylalanine, tyrosine and their metabolites typical of phenylketonuria (PKU) was determined in the cerebrospinal fluid (CSF) of 8 untreated children with classical PKU and 9 controls. At the same time, plasma a...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF01799945
更新日期:1991-01-01 00:00:00
abstract::One of the issues to be resolved in phenylketonuria is whether patients with mild hyperphenylalaninemia need treatment, or in other words, in what patients treatment needs to be started. Do patients need treatment when phenylalanine concentrations in blood are >360 μmol/L or >600 μmol/L? This paper reviews the literat...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
doi:10.1007/s10545-011-9283-y
更新日期:2011-06-01 00:00:00
abstract::Glycine encephalopathy, or nonketotic hyperglycinaemia (NKH; Mckusick 238300) is a severe autosomal recessive disease due to a defect in the glycine cleavage system (GCS), which is a complex of four subunits: P-, T-, H- and L-proteins. A P-protein (glycine decarboxylase or GLDC) deficiency was reported in about 80% of...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-006-0202-6
更新日期:2006-02-01 00:00:00
abstract::Organic acidaemias can present with a wide variety of signs and symptoms. A survey of the clinical presentation of the organic acidurias shows that single symptoms are not characteristic or diagnostic. Clinical awareness coupled with appropriate laboratory investigation is required for the correct diagnosis to be reac...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF03047369
更新日期:1984-01-01 00:00:00
abstract::Transaldolase (TAL) is an enzyme in the pentose phosphate pathway (PPP) that generates NADPH for protection against oxidative stress. While deficiency of other PPP enzymes, such as transketolase (TKT), are incompatible with mammalian cell survival, mice lacking TAL are viable and develop progressive liver disease attr...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1002/jimd.12197
更新日期:2020-05-01 00:00:00
abstract::Rapid diagnosis and early specific treatment of metabolic epilepsies due to inborn errors of metabolism (IEMs) is crucial to avoid irreversible sequalae. Nowadays, besides the profile analysis of amino- and organic acids, a range of additional targeted assays is used for the selective screening of those diseases. This...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1002/jimd.12244
更新日期:2020-09-01 00:00:00
abstract::Primary hyperoxaluria type I (PH1) is a rare disease caused by the deficit of liver alanine-glyoxylate aminotransferase (AGT). AGT prevents oxalate formation by converting peroxisomal glyoxylate to glycine. When the enzyme is deficient, progressive calcium oxalate stones deposit first in the urinary tract and then at ...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-017-0105-8
更新日期:2018-03-01 00:00:00
abstract::Four neonates with a positive phenylalanine screening test (Phe concentrations between 258 and 1250 micromol/L) were investigated further to differentiate between phenylalanine hydroxylase (PAH) deficiency and variant hyperphenylalaninaemia (HPA) forms. In patients 1 and 2 a tetrahydrobiopterin (BH4) load caused a sig...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1023/a:1010596317296
更新日期:2001-06-01 00:00:00
abstract::Latin America includes more than 40 countries and possessions, and its population of 570 million has an important representation of the three main human races. The area is experiencing an economic improvement, progressively bringing the inborn errors of metabolism (IEM) to a higher level among health priorities. Chall...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-010-9112-8
更新日期:2010-10-01 00:00:00
abstract:BACKGROUND:Cerebrotendinous xanthomatosis (CTX) is a rare genetic disorder, characterised by chronic diarrhoea, xanthomas, cataracts, and neurological deterioration. CTX is caused by CYP27A1 deficiency, which leads to abnormal cholesterol and bile acid metabolism. Urinary bile acid profiling (increased m/z 627: glucuro...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1002/jimd.12219
更新日期:2020-07-01 00:00:00
abstract::Carnitine uptake has been studied in fibroblasts from a case of hereditary carnitine deficiency and in relatives. There was no evidence for carrier-dependent uptake in cells from the patient. The mother and probably the healthy sister had an impaired uptake. The results show that the defect in this form of carnitine d...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/BF01800711
更新日期:1989-01-01 00:00:00
abstract::Phosphoglucomutase 1 (PGM1) deficiency is a rare genetic disorder that affects glycogen metabolism, glycolysis, and protein glycosylation. Previously known as GSD XIV, it was recently reclassified as a congenital disorder of glycosylation, PGM1-CDG. PGM1-CDG usually manifests as a multisystem disease. Most patients pr...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
doi:10.1002/jimd.12286
更新日期:2021-01-01 00:00:00
abstract::Aspartylglycosaminuria (AGU, McKusick 20840) is a metabolic disorder affecting the catabolism of glycoproteins. It was first described in 1967, by Jenner and Pollitt, in two mentally retarded English siblings. Subsequently several cases were reported from Finland (Palo and Mattsson, 1970; Autio, 1972; Autio et al., 19...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章,评审
doi:10.1007/BF02179139
更新日期:1982-01-01 00:00:00
abstract:OBJECTIVES:To study the incidence of galactosaemia in the state of São Paulo and the benefit/cost (B/C) ratio of the introduction of neonatal screening for galactosaemia, comparing it with a selective approach. METHODS:An enzymatic-colorimetric assay was used for the screening of total galactose (TG) in a sample of 10...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-009-1112-1
更新日期:2009-12-01 00:00:00
abstract:OBJECTIVE:Acyl-CoA oxidase (ACOX1) deficiency is a rare disorder of peroxisomal very-long chain fatty acid oxidation. No reports detailing attempted treatment, longitudinal imaging, or neuropathology exist. We describe the natural history of clinical symptoms and brain imaging in two siblings with ACOX1 deficiency, inc...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-014-9698-3
更新日期:2014-09-01 00:00:00
abstract::Cystathionine beta synthase (CBS) deficiency is a recessive inborn error of metabolism characterized by elevated serum total homocysteine (tHcy). Betaine supplementation, which can lower tHcy by stimulating homocysteine remethylation to methionine, is often given to CBS deficient patients in combination with other tre...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-015-9883-z
更新日期:2016-01-01 00:00:00
abstract::The congenital disorder of glycosylation, PMM2-CDG, is associated with progressive photoreceptor degeneration, which causes a pigmentary retinopathy. We identified a sibling pair, mildly affected with PMM2-CDG, who showed preserved photoreceptor function, but profound deficits of the 'on-pathway' in the retina. This l...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-013-9594-2
更新日期:2013-11-01 00:00:00
abstract::Retinitis pigmentosa can occur as a complication of mevalonate kinase deficiency. This may be due to the unique isoprenoid metabolism in the retina. Early detection requires awareness on the part of the treating physician. ...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1007/s10545-005-0178-7
更新日期:2005-01-01 00:00:00
abstract::We report a retrospective electron-microscopical study of liver biopsies and fibroblast cultures of 19 patients with congenital disorders of glycosylation (CDG) of different subtypes. A constant finding in liver biopsies of all CDG-I cases was that of abnormal lysosomal lamellar inclusions in the hepatocytes, which we...
journal_title:Journal of inherited metabolic disease
pub_type: 杂志文章
doi:10.1023/a:1024023429680
更新日期:2003-01-01 00:00:00