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  • 1
    ISSN: 1546-1718
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Medizin
    Notizen: [Auszug] Lacrimo-auriculo-dento-digital (LADD) syndrome is characterized by lacrimal duct aplasia, malformed ears and deafness, small teeth and digital anomalies. We identified heterozygous mutations in the tyrosine kinase domains of the genes encoding fibroblast growth factor receptors 2 and 3 (FGFR2, ...
    Materialart: Digitale Medien
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  • 2
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Population and family studies have confirmed the existence of a plasma a-l-fucosidase polymorphism in humans and the autosomal recessive inheritance of the low activity trait. The frequency of the latter is estimated at 11%. The low activity individuals or variants can also be distinguished by the fact that their plasma a-l-fucosidase is heat-inactivated at acidic pH. Sucrose gradient centrifugation results indicate the transition of non-variant plasma a-l-fucosidase with a molecular weight of 66,000 at pH 8.4 to an enzyme form with a molecular weight of 193,000 at pH 3.0. The former is thermolabile, the latter thermostable. Interconversion is pH-dependent. It is hypothesized that the non-variant enzyme, a monomer at alkaline pH, changes upon acidification into a trimeric conformation via dimerization. The thermolabile variant a-l-fucosidase monomer is not converted into a trimer, but only partially into a dimer.
    Materialart: Digitale Medien
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  • 3
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Serum N-acetyl-beta-D-hexosaminidase is compared quantitatively and qualitatively in 14 obligate heterozygotes for the mutant gene causing I cell disease (ICD) or mucolipidosis II and in 31 normal controls. The average specific activity in either group is significantly different but reliable heterozygote detection cannot be achieved because of some overlapping of the ranges of individual results. Fractionation of the enzyme either by DEAE cellulose column chromatography, or by heat inactivation, yields a typical average result for each genotype. Also, mere expression of the various components as percentages of the total activity is not useful for certain identification of the ICD heterozygote. There is considerable overlapping of the percents hexosaminidase I1 and A in both groups of sera. If enzymatic hydrolysis by any component is expressed as a partial activity, a much between though not absolute distinction between the ICD heterozygote and the normal control becomes possible. Only the latter way of expression of hexosaminidase results makes distinction between the ICD heterozygote and the Tay-Sachs heterozygote very probable.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Human genetics 〈Berlin〉 20 (1973), S. 119-123 
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Es zeigte sich, daß die durchschnittliche Aktivität der N-Acetyl-β-D-Glucosaminidase, der β-D-Glucuronidase, der Arylsulfatase A und der β-D-Galaktosidase im Serum von 10 Patienten, die gesichert heterozygot für das Gen waren, das die Inclusion-Cell Disease (ICD) verursacht, sich signifikant unterscheidet von der Aktivität in Seren einer altersentsprechenden Kontrollgruppe. Da sich die beiden Gruppen hinsichtlich ihrer Aktivitäten der sauren Serumhydrolasen überschneiden, erscheint ein Bestimmen dieses Enzyms für eine wohlfundierte Untersuchung auf einen heterozygoten Genotypus bezüglich der ICD ungeeignet. Die Tatsache, da\ sich im Serum eines Heterozygoten das mutierte Allel ebenfalls teilweise manifestiert, mag als eine Hilfe gelten für die Entscheidung, welche von den z. Z. bestehenden Hypothesen bezüglich der Ursache dieses primär metabolischen Defektes die richtige ist.
    Notizen: Summary The mean activities of N-acetyl-β-D-glucosaminidase, β-D-glucuronidase, arylsulphatase A and β-D-galactosidase in the serum of 10 proved heterozygotes for the mutant gene causing I-cell disease (ICD) are significantly different from those in age-matched control sera. Overlapping of individual results in both groups renders assay of serum acid hydrolases an impractical method of reliable detection of the ICD heterozygous genotype. That the mutant gene is also partially expressed in heterozygote serum, may be useful in assessing existing hypoteses on the nature of its primary metabolic defect.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    European journal of pediatrics 136 (1981), S. 245-248 
    ISSN: 1432-1076
    Schlagwort(e): Neonatal ; Progeroid ; Absent subcutaneous fat ; Autosomal recessive ; Hutchinson-Gilford progeria ; Hallermann-Streiff syndrome ; Congenital lipoatrophic diabetes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A 4-year-old girl is reported with a neonatally apparent progeroid syndrome. Parental consanguinity indicates autosomal recessive inheritance. Psychomotor development and physical growth are severely deficient. Mainly characterized by congenital absence of subcutaneous fat tissue, this child is very similar to four patients reported earlier and recognized as representing a newly delineated clinical entity, called here the Wiedemann-Rautenstrauch or neonatal progeroid syndrome.
    Materialart: Digitale Medien
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  • 6
    ISSN: 1432-1076
    Schlagwort(e): Spondylocostal dysostosis ; Urinary tract anomaly
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A two-year-old girl with spondylocostal dysostosis and urinary tract anomalies is described. Genetic counselling to the healthy non-consanguineous parents is based on the hypothesis of autosomal recessive inheritance. At birth this type of spondylocostal dysostosis can be differentiated radiographically from related conditions by the severe and generalized anomaly of the entire vertebral column, and by the typical configuration of the posteriorly-fused ribs. Only the cardinal clinical features of a short trunk and a short, immobile neck are consistently present in all patients. In one group of patients the severe thoracic malformation and lordosis contribute to cardiopulmonary problems with a fatal outcome in early infancy. The roentgenographic changes are less marked in other patients, whose subsequent clinical course is usually without major problems but remains at present insufficiently known.
    Materialart: Digitale Medien
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