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Related Experiment Videos

Reference typing report for complement component C4.

G Mauff1, B Luther, P M Schneider

  • 1Department Immunology, Virology, Vaccinations, State Institute of Hygiene, Hamburg, Germany. hyginsthh@vossnet.de

Experimental and Clinical Immunogenetics
|March 11, 1999
PubMed
Summary
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Complement C4 typing remains challenging, especially for nonexpressed alleles and rare variants. Advanced techniques like PCR and monoclonal antibodies are needed alongside protein allotyping for accurate genetic interpretation.

Area of Science:

  • Human Genetics
  • Immunogenetics
  • Protein Chemistry

Background:

  • The 7th Complement Genetics Workshop focused on complement component C4 (C4) typing.
  • The primary goals were to define reference C4 alleles/phenotypes and identify nonexpressed (Q0) C4 alleles.
  • Existing protein-typing technologies were applied to analyze C4 allotypes and isotypes.

Framework:

  • Fourteen laboratories participated, testing eleven blinded samples using basic protein-typing and local expertise.
  • Samples were characterized by their allotype expression, including partial or total nonexpression of isotypes.
  • A reference typing exercise was conducted to evaluate current C4 typing methodologies.

Implementation:

  • Samples were categorized into common, less common, and difficult pheno-/allotypes.

Related Experiment Videos

  • Difficulties arose with new allotypes (C4A '92', C4B '93'), reversed antigenicity, and unusual Rodgers/Chido (Rg/Ch) PCR subtypes.
  • Semiquantitative C4-alpha-chain estimates showed good correlation with agarose gel electrophoresis allele counts.

    • Implications:

    • Recognizing rare, aberrant, or hybrid C4 alleles with reversed antigenicity remains difficult.
    • Identifying nonexpressed C4A and C4B alleles within expressed phenotypes is a major obstacle in C4 genetic typing.
    • Accurate DNA typing interpretation requires integration with comprehensive protein-level allotyping data.