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Differential enzyme activities in human esterase D phenotypes.

S Horai, E Matsunaga

    Human Genetics
    |January 1, 1984
    PubMed
    Summary

    Red blood cell esterase D (ESD) enzyme activity varies by phenotype. Individuals with ESD-1 showed the highest activity, while ESD-2 individuals had the lowest, with ESD1-2 in between.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Enzymology

    Background:

    • Esterase D (ESD) is a key enzyme involved in cellular metabolism.
    • Phenotypic variations in ESD activity can impact biological functions.
    • Understanding ESD activity is crucial for genetic and biochemical studies.

    Purpose of the Study:

    • To quantify red blood cell ESD enzyme activity across different ESD phenotypes.
    • To establish reference ranges for ESD activity based on genotype.
    • To investigate the quantitative relationship between ESD gene variants and enzyme activity.

    Main Methods:

    • Assay of red blood cell esterase D (ESD) enzyme activity.
    • Measurement of enzyme activity in 78 individuals with ESD-1, 94 with ESD2-1, and 28 with ESD-2 phenotypes.
    • Enzyme activity expressed as 10(-7) M methylumbelliferone produced/h/g Hb.

    Main Results:

    • Mean red cell ESD activities were 276.7, 216.6, and 171.5 (units: 10(-7) M methylumbelliferone/h/g Hb) for ESD-1, ESD2-1, and ESD-2 phenotypes, respectively.
    • Significant differences in mean ESD activity were observed between the three phenotype groups.
    • The ESD*1 gene variant was associated with approximately 60% higher activity compared to the ESD*2 variant.

    Conclusions:

    • Red blood cell ESD enzyme activity is strongly correlated with ESD phenotype.
    • The ESD*1 allele confers significantly higher enzyme activity than the ESD*2 allele.
    • These findings provide quantitative insights into the genetic basis of ESD enzyme activity variation.

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