A DEL phenotype attributed to RHD Exon 9 sequence deletion: slipped‐strand mispairing and blood group polymorphisms
Transfusion2017Vol. 58(3), pp. 685–691
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Genghis H. Lopez, Robyn Turner, Eunike C. McGowan, Elizna M. Schoeman, Stacy A. Scott, Helen O’Brien, Glenda Millard, Eileen Roulis, Amanda J. Allen, Yew‐Wah Liew, Robert L. Flower, Catherine A. Hyland
Abstract
Deletion mutations bordered by repeat sequences are a hallmark of slipped-strand mispairing (SSM) event. We propose this genetic mechanism generated the germline deletion in the Caucasian donor. Extensive studies show that the RHD*1227A is the most prevalent DEL allele in East Asian populations and may have confounded the initial molecular studies. Review of the literature revealed that the SSM model explains some of the extreme polymorphisms observed in the clinically significant RhD blood group antigen.
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