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Objective: To establish and evaluate nested polymerase chain reaction (PCR) for detection of Y-chromosome-specific fetal DNA in maternal blood circulation during pregnancy and its clearance several days after delivery. Materials and Methods: Genomic DNA was isolated from a male donor to amplify Y-chromosome-specific DNA sequences by using four pairs of oligonucleotide primers targeting single or multiple copy genes in standard and nested PCR. The nested PCR was evaluated for detection of Y-chromosome-specific sequences in the maternal blood circulation of pregnant women bearing a male fetus during pregnancy and at 2 and 24 h and 7 days after delivery. Results: Although both standard and nested PCR assays were established by using genomic DNA from a male donor to detect Y-chromosome-specific DNA sequences, the nested PCR was 10 times more sensitive than standard PCR. Further experiments showed that nested PCR was able to detect Y-chromosome-specific DNA in the peripheral blood cells as well as in the plasma and serum of pregnant women carrying a male fetus. When tested with plasma samples from women carrying male fetuses during pregnancy, nested PCR was positive with 53/55 (96%), 22/22 (100%), 16/22 (73%) and 0/30 (0%) specimens obtained before and at 2 and 24 h and 7 days after delivery, respectively. These results showed that fetus-specific Y-chromosome DNA was cleared from maternal circulation within 7 days of delivery. Conclusion: Our results suggest that nested PCR is useful in fetal sex determination and that prenatal diagnosis can be done without interference from previous pregnancy.

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Establishment and Evaluation of Polymerase Chain Reaction for Detection of Y-Chromosome-Specific Fetal DNA in Maternal Blood Circulation during Pregnancy and after Delivery