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C4 reference typing report.

G Mauff1, M Brenden, M Braun-Stilwell

  • 1Institut für Medizinische Mikrobiologie und Hygiene, University of Cologne, FRG.

Complement and Inflammation
|January 1, 1990
PubMed
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This study established reference variants for human complement C4 (C4) typing, identifying common and rare alleles, duplications, deletions, and hybrid genes. The findings led to a revised C4 nomenclature, improving classification of C4 allotypes.

Area of Science:

  • Immunogenetics
  • Molecular immunology
  • Human genetics

Background:

  • Human complement component 4 (C4) exhibits significant protein-level polymorphism.
  • Distinguishing C4A and C4B allotypes relies on electrophoretic patterns and hemolytic activity.
  • Accurate C4 typing is crucial for understanding genetic variations and their implications.

Purpose of the Study:

  • To define reference variants for human C4 typing.
  • To identify and characterize rare C4 variants, including duplications, deletions, non-expressed alleles, and hybrid genes.
  • To reclassify and revise the nomenclature of C4 allotypes based on comprehensive analysis.

Main Methods:

  • Investigated samples from 136 individuals using standard electrophoretic techniques.

Related Experiment Videos

  • Assessed relative hemolytic activity, reactivity with monoclonal antibodies and Rg/Ch reagents.
  • Analyzed alpha- and beta-chain types, electrophoretic migration distance, and C4/21-OH-TaqI RFLPs.

    • Main Results:

    • Defined eight common C4 alleles and ten standard Rg/Ch phenotypes.
    • Identified twelve C4A and fourteen C4B duplications, along with deleted/non-expressed alleles and hybrid genes.
    • Defined new allotypes (A 8, A 7, A 58, A 55, A 45, B 45, B 35, B 22) and refined allele subdivisions.

    Conclusions:

    • Reference typing enabled reclassification of most described C4 allotypes.
    • Established a revised nomenclature for C4, improving clarity and consistency.
    • Provided a robust framework for future C4 genetic studies.