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Membrane abnormality in red blood cells with weak type B expression

A Yoshida, H Fujii, V Davé

    Blood
    |November 1, 1980
    PubMed
    Summary

    Weak blood group B expression in A2Bm individuals is not due to ABO gene mutations. Instead, it stems from genetic abnormalities in red cell membrane components affecting glycosylation.

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    Area of Science:

    • Immunogenetics
    • Biochemistry
    • Hematology

    Background:

    • The molecular basis for weak blood group expressions, particularly weak B antigen, remains incompletely understood.
    • Family studies with A2Bm blood group provide a unique model to investigate these unusual expressions.

    Purpose of the Study:

    • To investigate the enzymatic properties of blood group galactosyltransferase (B-enzyme) and red cell membrane characteristics in individuals with A2Bm blood group.
    • To elucidate the mechanisms underlying the weak B expression in this specific blood group.

    Main Methods:

    • Assessed B-enzyme activity and kinetic properties (Km, pH optima) in A1Bm plasma and compared them to normal B-enzyme.
    • Incubated A1Bm red blood cells with UDP-Gal and B-enzyme to assess agglutinability.
    • Quantified sugar incorporation into A1Bm red cell membranes using radiolabeled nucleotide sugars (UDP-Gal3H, UDP-GalNAc3H) with A-enzyme and B-enzyme.
    • Analyzed labeled membrane components using isoelectric focusing.

    Main Results:

    • B-enzyme activity and kinetic properties in A1Bm subjects were comparable to normal B-enzyme.
    • Incubation restored strong B antigen expression on A1Bm red cells.
    • A1Bm membranes showed approximately 40%-50% of the sugar incorporation capacity of O membranes, indicating incomplete H-site glycosylation.
    • Isoelectric focusing revealed distinct differences in labeled membrane components between A1Bm and O individuals.

    Conclusions:

    • Weak B expression in A2Bm individuals is not caused by direct mutations in the ABO locus.
    • The phenomenon is likely a secondary consequence of genetic abnormalities affecting membrane components associated with blood group substances.
    • This suggests a complex interplay between membrane structure and ABO blood group expression.

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