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© Research
Publication : European journal of immunogenetics : official journal of the British Society for Histocompatibility and Immunogenetics

A new PCR-based typing of the Rodgers and Chido antigenic determinants of the fourth component of human complement.

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in European journal of immunogenetics : official journal of the British Society for Histocompatibility and Immunogenetics - 01 Oct 1994

Barba GM, Braun-Heimer L, Rittner C, Schneider PM,

Link to Pubmed [PMID] – 9098442

Eur J Immunogenet 1994 Oct; 21(5): 325-39

The Rodgers (Rg) and Chido (Ch) blood groups are antigenic determinants of the fourth component of human complement C4. They are associated with the two isotypes of C4, C4A and C4B, respectively. They serve as markers to distinguish C4A from C4B as well as for the definition of subtypes of common and rare allotypes. As an alternative to the serological typing method using human alloantisera, a PCR typing procedure with sequence-specific primers (PCR-SSP) was designed. The method was tested on selected DNA samples from individuals with well-defined C4 allotypes. No false-positive or false-negative typing results were obtained and all the determinant combinations could be distinguished. The PCR genotyping allowed the detection of all Rg/Ch sequence determinants of each isotype. Thus, reverse antigenicity could also be established in the presence of other C4 allotypes without a segregation study. To exclude the possibility that PCR-typed determinants originate from a non-expressed C4 null gene, a sequence-specific PCR was established detecting a 2-bp insertion in exon 29 described previously as a cause for C4A non-expression. PCR Rg/Ch genotyping provides a fast and efficient method for routine typing in HLA haplotype and disease association studies.