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An update on Rodgers and Chido, the antigenic determinants of human C4 Cover

An update on Rodgers and Chido, the antigenic determinants of human C4

By: C.M. Giles  
Paid access
|Dec 2020

Abstract

Rodgers (Rg) and Chido (Ch) blood groups are antigenic determinants of the fourth component of human complement (C4). Nine determinants have been defined by means of hemagglutination-inhibition (HAI) with polyspecific human antiserums. The association of C4A isotypes with Rg and of C4B isotypes with Ch is strong but not complete. Derived amino acid sequences from the C4d region of selected C4 allotypes of known antigenic expression have provided support for the previously reported complex serologic interrelationships. A structural model for antigenic determinants at four polymorphic sites, incorporating sequential and conformational epitopes, was subsequently proposed. Allotype and Rg/Ch data obtained from donors and patients, many with accompanying families, have augmented the model and revealed no exceptions. The antigenic determinants, therefore, make an important contribution to the complex polymorphism of C4.

DOI: https://doi.org/10.21307/immunohematology-2019-1057 | Journal eISSN: 1930-3955 | Journal ISSN: 0894-203X
Language: English
Page range: 1 - 6
Published on: Dec 27, 2020
Published by: American National Red Cross
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2020 C.M. Giles, published by American National Red Cross
This work is licensed under the Creative Commons License.