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Molecular typing for blood group antigens within 40 min by direct polymerase chain reaction from plasma or serum
Author(s) -
Wagner Franz F.,
Flegel Willy A.,
Bittner Rita,
Döscher Andrea
Publication year - 2017
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1111/bjh.14469
Subject(s) - genotyping , polymerase chain reaction , typing , antigen , melting curve analysis , serology , biology , microbiology and biotechnology , genotype , immunology , virology , antibody , genetics , gene
Summary Determining blood group antigens by serological methods may be unreliable in certain situations, such as in patients after chronic or massive transfusion. Red cell genotyping offers a complementary approach, but current methods may take much longer than conventional serological typing, limiting their utility in urgent situations. To narrow this gap, we devised a rapid method using direct polymerase chain reaction ( PCR ) amplification while avoiding the DNA extraction step. DNA was amplified by PCR directly from plasma or serum of blood donors followed by a melting curve analysis in a capillary rapid‐cycle PCR assay. We evaluated the single nucleotide polymorphisms underlying the clinically relevant Fy a , Fy b , Jk a and Jk b antigens, with our analysis being completed within 40 min of receiving a plasma or serum sample. The positive predictive value was 100% and the negative predictive value at least 84%. Direct PCR with melting point analysis allowed faster red cell genotyping to predict blood group antigens than any previous molecular method. Our assay may be used as a screening tool with subsequent confirmatory testing, within the limitations of the false‐negative rate. With fast turnaround times, the rapid‐cycle PCR assay may eventually be developed and applied to red cell genotyping in the hospital setting.