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Approximate linkage equilibrium between two polymorphic sites within the gene for human complement component 3.

J A Donald, S P Ball

    Annals of Human Genetics
    |July 1, 1984
    PubMed
    Summary
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    This study determined human complement component 3 gene haplotypes using protein and RFLP polymorphisms. Close linkage between these sites showed no significant disequilibrium, indicating independent inheritance patterns.

    Area of Science:

    • Human genetics
    • Molecular biology
    • Immunogenetics

    Background:

    • Complement component 3 (C3) is crucial in the immune system.
    • Understanding C3 gene variation is important for genetic studies.
    • Polymorphisms within the C3 gene can be identified using various molecular techniques.

    Purpose of the Study:

    • To determine haplotypes for alleles at two polymorphic sites in the human C3 gene.
    • To investigate the linkage disequilibrium between these two sites.

    Main Methods:

    • Identification of protein polymorphism at specific sites within the C3 gene.
    • Identification of restriction fragment length polymorphism (RFLP) using a cloned C3 gene probe.
    • Hybridization techniques for RFLP analysis.

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    Main Results:

    • Haplotypes were successfully determined for the two analyzed polymorphic sites.
    • No evidence of significant linkage disequilibrium was found between the alleles at these closely linked sites.

    Conclusions:

    • The analyzed polymorphic sites within the human C3 gene are inherited largely independently.
    • This finding has implications for genetic association studies involving the C3 gene.