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Related Experiment Videos

Polymorphism of human thyroxine-binding globulin.

S Grimaldi, L Bartalena, C Ramacciotti

    The Journal of Clinical Endocrinology and Metabolism
    |December 1, 1983
    PubMed
    Summary
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    Thyroxine-binding globulin (TBG) exhibits microheterogeneity due to variations in amino acid composition and genetic factors, particularly in black populations. This study identifies two types of TBG polymorphism unrelated to its carbohydrate content.

    Area of Science:

    • Biochemistry
    • Genetics
    • Molecular Biology

    Background:

    • Thyroxine-binding globulin (TBG) is a key protein in thyroid hormone transport.
    • TBG contains oligosaccharide units with sialic acid residues, contributing to its heterogeneity.
    • Previous studies suggested TBG microheterogeneity might stem from glycosylation variations.

    Purpose of the Study:

    • To investigate the sources of TBG microheterogeneity.
    • To determine if TBG microheterogeneity is genetically determined.
    • To characterize TBG polymorphism in different ethnic groups.

    Main Methods:

    • Isoelectric focusing (IEF) of purified TBG and plasma samples.
    • Deglycosylation of TBG using mixed glycosidases and neuraminidase.

    Related Experiment Videos

  • Radiolabeling of TBG with [125I]T4 for autoradiography.
  • Two-dimensional IEF to assess conformational stability.

    • Main Results:

    • Deglycosylation of TBG reduced heterogeneity to two bands, indicating residual variation unrelated to carbohydrates.
    • Residual microheterogeneity after deglycosylation was attributed to amino acid composition differences.
    • Two distinct genetic polymorphisms of TBG (TBG-1 and TBG-2) were identified, primarily in black donors.
    • TBG-1,2 phenotype exhibited combined bands from both TBG-1 and TBG-2.

    Conclusions:

    • TBG exhibits microheterogeneity arising from both amino acid variations and genetic polymorphism.
    • The identified genetic polymorphism is independent of TBG's carbohydrate moiety.
    • TBG polymorphism presents distinct patterns in different ethnic populations, particularly in black individuals.