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  • 1
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 20 (1973), S. 119-123 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: 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.
    Notes: 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.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: 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.
    Type of Medium: Electronic Resource
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