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Apolipoprotein A-IV polymorphism in man

H J Menzel, P M Kövary, G Assmann

    Human Genetics
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Apolipoprotein A-IV exhibits genetic polymorphism in humans, with two common isoforms (A-IV-1 and A-IV-2) identified. A rare variant, apolipoprotein A-IV-Münster, was also detected and shown to be inherited in a Mendelian fashion.

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    Area of Science:

    • Human genetics
    • Biochemistry
    • Epidemiology

    Background:

    • Apolipoprotein A-IV (A-IV) is a protein involved in lipid metabolism.
    • A genetically determined polymorphism of A-IV exists in humans, with two main isoforms, A-IV-1 and A-IV-2.
    • Isoelectric focusing is a technique used to separate proteins based on their isoelectric point.

    Purpose of the Study:

    • To investigate the genetic polymorphism of apolipoprotein A-IV in a human population.
    • To identify and characterize different isoforms and variants of apolipoprotein A-IV.
    • To determine the inheritance pattern of a newly identified apolipoprotein A-IV variant.

    Main Methods:

    • Epidemiological study involving 1000 healthy factory workers.
    • Isoelectric focusing to identify apolipoprotein A-IV isoforms (A-IV-1 and A-IV-2).

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  • Analysis of family members to demonstrate Mendelian inheritance of a variant.

    • Main Results:

    • The common A-IV-1 isoform (genotype 1-1) was found in 85% of individuals.
    • The A-IV-2 isoform (genotype 2-2) was observed in 0.5% of individuals.
    • The combined genotype (1-2) was present in 14% of individuals.
    • A novel variant, apolipoprotein A-IV-Münster, was detected in four subjects and its Mendelian inheritance was confirmed.

    Conclusions:

    • Apolipoprotein A-IV exhibits significant genetic polymorphism in the human population.
    • The common isoforms A-IV-1 and A-IV-2 show a distinct allele frequency distribution.
    • A rare, inherited variant (A-IV-Münster) of apolipoprotein A-IV has been identified.