D'Souza E, Ghosh K, Colah R. A comparison of the choice of monoclonal antibodies for recovery of fetal cells from maternal blood using FACS for noninvasive prenatal diagnosis of hemoglobinopathies.
CYTOMETRY PART B-CLINICAL CYTOMETRY 2009;
76:175-80. [PMID:
18831520 DOI:
10.1002/cyto.b.20460]
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Abstract
BACKGROUND
Isolation of adequate numbers of fetal cells circulating in the maternal circulation is the major hurdle in developing noninvasive prenatal diagnostic procedures. We used flow cytometry and a combination of different monoclonal antibodies to compare the yield and purity of the fetal nucleated red blood cells at different periods of gestation.
METHODS
Using a Percoll discontinuous gradient, the fetal nucleated erythrocytes were enriched from 7 ml maternal blood. In 100 samples, the enriched cells were stained with CD45, anti-fetal hemoglobin, and glycophorin A antibodies and in 30 samples they were stained with CD45, anti-fetal hemoglobin, and CD71 and then sorted and used for fetal diagnosis of hemoglobinopathies.
RESULTS
Using the first set of antibodies, although we were able to obtain a higher percentage of fetal nucleated red cells (0.07% +/- 0.2%) as compared to the second set which yielded comparatively smaller numbers (0.025% +/- 0.03%), there was some compromise in purity.
CONCLUSION
Using CD45, anti-fetal hemoglobin and CD71 would be preferred as minimizing maternal contamination is more important than yield for prenatal diagnosis.
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