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D'SOUZA, Edna; SAWANT, Pratibha M; NADKARNI, Anita H; GORAKSHAKAR, Ajit; MOHANTY, Dipika; GHOSH, Kanjaksha; COLAH, Roshan B
American journal of clinical pathology, 08/2008, Letnik: 130, Številka: 2Journal Article
Our purpose was to develop and evaluate isolation and enrichment of fetal erythroblasts and a nested polymerase chain reaction (PCR) approach using fetal erythroblasts for detecting the beta-globin gene mutations for a noninvasive prenatal diagnosis of hemoglobinopathies. Maternal blood at different periods of gestation was layered on a Percoll density gradient for enrichment of fetal nucleated RBCs (NRBCs). A combination of 3 monoclonal antibodies (CD45-peridinin chlorophyll protein, glycophorin A-phycoerythrin, and anti-hemoglobin F-fluorescein isothiocyanate) was used for flow cytometric sorting of fetal NRBCs from enriched cells. Different nested PCR-based approaches were used for identification of fetal mutations. Owing to heterogeneity of beta-thalassemia mutations in the population of India, we had to screen for 12 mutations and were able to give an accurate diagnosis in 84 (84.0%) of 100 cases when compared with chorionic villus sampling or cordocentesis and DNA analysis.This nested PCR approach enabled amplification of small quantities of DNA from fetal erythroblasts, providing a cost-effective method for noninvasive diagnosis.
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