ABSTRACT
【Objective】 To study the frequency, Rh phenotypes and molecular & biological background of D-elute (Del) phenotype in RhD-negative blood donors in Dalian. 【Methods】 A total of 355 serologically RhD-negative samples between November, 2018 and October, 2019 in Dalian Blood Center were collected, and tested for RhC, c, E, e phenotypes using monoclonal antibodies and anti-D adsorption/elution test. DNA was extracted by magnetic bead selection. RHD 1227G>A mutation was detected by melting curve analysis. All RHD exons were sequenced by Sanger sequencing. 【Results】 Among 355 serologically RhD-negative blood donors, 55 (15.5%) were identified as Del and the remaining 300 cases (84.5%) were true RhD negative. Ccee (45/55, 81.8%) was the predominant Rh phenotype among 55 Del cases while ccee (210/300, 70.0%) was the most prevalent Rh phenotypes in 300 true RhD negative cases. In 55 Del cases, 51 (92.7%) had RHD 1227G>A mutation, and the other 4 cases(7.3%) had mutations in other sites. 【Conclusion】 The frequency of Del was 15.5% in serologically RhD-negative blood donors in Dalian, with Ccee being the most prevalent Rh phenotype and RHD 1227G>A the most common gene mutation.