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- W4256100421 abstract "Antigens of the Rh blood group system are encoded by 2 homologous genes, RHD and RHCE, that produce 2 red cell membrane proteins. The D-negative phenotype is considered to result, almost invariably, from homozygosity for a complete deletion ofRHD. The basis of all PCR tests for predicting fetal D phenotype from DNA obtained from amniocytes or maternal plasma is detection of the presence of RHD. These tests are used in order to ascertain the risk of hemolytic disease of the newborn. We have identified an RHD pseudogene (RHD ψ) in Rh D-negative Africans. RHDψ contains a 37 base pair (bp) insert in exon 4, which may introduce a stop codon at position 210. The insert is a sequence duplication across the boundary of intron 3 and exon 4.RHDψ contains another stop codon in exon 6. The frequency ofRHDψ in black South Africans is approximately 0.0714. Of 82 D-negative black Africans, 66% hadRHDψ, 15% had the RHD-CE-D hybrid gene associated with the VS+ V– phenotype, and only 18% completely lackedRHD. RHDψ is present in about 24% of D-negative African Americans and 17% of D-negative South Africans of mixed race. No RHD transcript could be detected in D-negative individuals with RHDψ, probably as a result of nonsense-mediated mRNA decay. Existing PCR-based methods for predicting D phenotype from DNA are not suitable for testing Africans or any population containing a substantial proportion of people with African ethnicity. Consequently, we have developed a new test that detects the 37 bp insert in exon 4 of RHDψ. (Blood. 2000; 95:12-18)" @default.
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- W4256100421 date "2000-01-01" @default.
- W4256100421 modified "2023-10-02" @default.
- W4256100421 title "The presence of an RHD pseudogene containing a 37 base pair duplication and a nonsense mutation in Africans with the Rh D-negative blood group phenotype" @default.
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- W4256100421 doi "https://doi.org/10.1182/blood.v95.1.12.001k37_12_18" @default.
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