title: Detection of RhD(el) in RhD-negative persons in clinical laboratory.
abstract: The Rhesus (Rh) blood group is the most polymorphic human blood group system, and it is clinically significant in transfusion medicine. About 15% of Caucasoid people are RhD-negative, whereas in the Asian population, the RhD-negative blood type only occurs in 0.1% to 0.5%. However, approximately 30% of apparently RhD-negative Taiwanese people actually were RhD(el). Traditionally, we verify RhD(el) by a serologically adsorption-elution procedure with polyclonal anti-D. In our recent report, RhC phenotype is highly associated with RhD(el), and RHD1227A is a useful genetic marker for RhD(el). For setting up a rapid protocol to detect RhD(el) in clinical laboratory, a total number of 395 Taiwanese serological RhD-negative blood samples, those with RhC (+) phenotypes as selected by serological tests, were further screened by adsorption/elution tests and RHD1227A allele by specific sequence primer-polymerase chain reaction (SSP-PCR) for RhD(el). Among 395 blood samples collected from RhD-negative subjects, the incidence of RhC (+) was 43% (171/395). One hundred and twenty six of the 171 RhC (+) samples were positive for both adsorption/elution for RhD detection and SSP-PCR assay for RHD1227A. The sensitivity and specificity were 96.9% and 97.5%, respectively, for RHD1227A detection as compared with the traditional adsorption/elution test. Our results also indicated that RHD1227A was highly linked to Ce haplotypes (95.2%). In conclusion, combined RhC (+) phenotyping and RHD1227A analysis can be a simple and accurate laboratory screening protocol for RhD(el) detection in RhD-negative population.
authors.affiliation: Department of Medical Laboratory Science and Biotechnology, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
authors.forename: Ya-Hui
authors.initials: YH
authors.lastname: Wang
authors.forename: Jung-Chin
authors.initials: JC
authors.lastname: Chen
authors.forename: Kuan-Tsou
authors.initials: KT
authors.lastname: Lin
authors.forename: Yu-Jen
authors.initials: YJ
authors.lastname: Lee
authors.forename: Yu-Fen
authors.initials: YF
authors.lastname: Yang
authors.forename: Tsun-Mei
authors.initials: TM
authors.lastname: Lin
mesh_terms: D044466:Asian People / Q000235:genetics; D015510:Clinical Medicine / Q000379:methods*; D005838:Genotype; D006801:Humans; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D012204:Rh-Hr Blood-Group System / Q000235:genetics*; D013624:Taiwan
chemical_list: D012204:Rh-Hr Blood-Group System; C026410:Rho(D) antigen