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Related Experiment Videos

Glucosephosphate isomerase polymorphism in sheep.

E M Beatty, D L Doxey, J FitzSimons

    Animal Blood Groups and Biochemical Genetics
    |January 1, 1983
    PubMed
    Summary

    Two glucosephosphate isomerase (GPI) types, T and M, were identified in sheep. Enzyme polymorphism was confirmed due to the high frequency of the rarer type M, though inheritance patterns were unclear.

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    Area of Science:

    • Biochemistry
    • Genetics
    • Animal Science

    Background:

    • Glucosephosphate isomerase (GPI) is a crucial enzyme in glycolysis.
    • Enzyme polymorphism, variations in enzyme structure within a population, is important for genetic studies.
    • Previous research has not extensively characterized GPI types in sheep.

    Purpose of the Study:

    • To identify and describe glucosephosphate isomerase (GPI) types in sheep.
    • To investigate the genetic basis and inheritance patterns of GPI types in sheep.
    • To determine if GPI exhibits true enzyme polymorphism in sheep populations.

    Main Methods:

    • Serum samples from sheep were analyzed using polyacrylamide gel electrophoresis.
    • Two distinct GPI electrophoretic patterns, designated type T (3 bands) and type M (5-7 bands), were observed.
    • Mating experiments were conducted between sheep of different GPI types to analyze offspring phenotypes.

    Main Results:

    • Two distinct GPI types, T and M, were identified in the studied sheep population.
    • Offspring from crosses between type T and type M sheep showed a distribution of 0.72 for T and 0.28 for M.
    • No conclusive evidence for codominant alleles, simple Mendelian inheritance, or sex-linkage was found for GPI types.

    Conclusions:

    • The study describes two novel GPI types in sheep.
    • The frequency of the rarer GPI type M provides strong evidence for true enzyme polymorphism in sheep.
    • Further research is needed to elucidate the precise genetic control and inheritance of GPI types in sheep.

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