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Two HLA-linked loci controlling the fourth component of human complement.

G J O'Neill, S Y Yang, B Dupont

    Proceedings of the National Academy of Sciences of the United States of America
    |October 1, 1978
    PubMed
    Summary
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    Researchers identified a genetic polymorphism in the fourth component of human complement (C4) using immunofixation electrophoresis. This C4 genetic variation is linked to the HLA-B locus, providing insights into immune system genetics.

    Area of Science:

    • Immunogenetics
    • Human Complement System
    • Molecular Biology

    Background:

    • The fourth component of human complement (C4) plays a crucial role in the immune system.
    • Electrophoretic variations in C4 have been observed, suggesting underlying genetic polymorphisms.
    • Understanding C4 polymorphism is important for studying immune responses and related genetic associations.

    Purpose of the Study:

    • To describe an electrophoretic polymorphism of the fourth component of human complement (C4).
    • To investigate the genetic basis and inheritance patterns of C4 electrophoretic variants.
    • To determine the relationship between C4 polymorphism and the HLA histocompatibility gene complex.

    Main Methods:

    • Utilized immunofixation electrophoresis to analyze C4 banding patterns in EDTA plasma.

    Related Experiment Videos

  • Examined C4 polymorphism in unrelated blood donors and family members.
  • Conducted family studies to assess the segregation of C4 variants with HLA genes.

    • Main Results:

    • Observed three distinct C4 electrophoretic patterns: fast-moving anodal bands (F), slow-moving cathodal bands (S), and a combination (FS).
    • C4 patterns were detected in EDTA plasma but not in serum.
    • Family studies indicated that C4 polymorphism does not segregate with HLA genes in a simple Mendelian fashion, suggesting two distinct genetic loci (C4F and C4S) controlling the bands.

    Conclusions:

    • A novel electrophoretic polymorphism of human C4 was characterized.
    • The data support a two-locus model for C4 electrophoretic patterns (C4F and C4S), each controlling the presence or absence of specific band types.
    • Both C4F and C4S loci demonstrate close linkage to the HLA-B locus, highlighting the genetic organization of the human major histocompatibility complex.