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Clinical Chemistry 46: 1301-1309, 2000;
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(Clinical Chemistry. 2000;46:1301-1309.)
© 2000 American Association for Clinical Chemistry, Inc.

Articles

Quantitative Analysis of the Bidirectional Fetomaternal Transfer of Nucleated Cells and Plasma DNA

Y.M. Dennis Lo1,a, Tze K. Lau2, Lisa Y.S. Chan1, Tse N. Leung2 and Allan M.Z. Chang2

Departments of
1 Chemical Pathology and
2 Obstetrics and Gynecology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, New Territories, Hong Kong SAR.
a Author for correspondence. Fax 852-2194-6171; e-mail loym{at}cuhk.edu.hk

Background: Recently, much interest has been generated on the fetomaternal transfer of nucleated cells and plasma DNA. However, there has been no systematic quantitative comparison of these two directions and two modalities of trafficking within the same study population.

Methods: The fetus-to-mother transfer of nucleated cells and plasma DNA in pregnant women carrying male babies was studied using a real-time quantitative PCR assay for the SRY gene. For mother-to-fetus transfer, real-time quantitative PCR assays for the insertion/deletion polymorphisms involving the glutathione S-transferase M1 and angiotensin-converting enzyme genes were used.

Results: Of the 50 informative mother-baby pairs, maternal DNA was detected in the cellular fraction of umbilical cord blood in 24% of cases (12 of 50), at a median fractional concentration of 2.6 x 10-4 (interquartile range, 1.7 x 10-4 to 3.6 x 10-4). In the plasma fraction of cord blood, maternal DNA was detected in 30% (15 of 50) of cases at a median fractional concentration of 3 x 10-3 (interquartile range, 1 x 10-3 to 1.6 x 10-2). For the other direction of trafficking, fetus-to-mother transfer of nucleated cells was detected in 26% of cases (13 of 50) at a median fractional concentration of 3.2 x 10-4 (interquartile range, 0.6 x 10-4 to 7.6 x 10-4). In the plasma fraction, fetal DNA was detected in 100% of maternal plasma (50 of 50) at a median fractional concentration of 3 x 10-2 (interquartile range, 1.4 x 10-2 to 5.3 x 10-2).

Conclusions: This study indicated that significantly more fetal DNA is present in the plasma of pregnant women compared with DNA from the cellular fraction of maternal blood. In addition, maternal DNA was demonstrated in both the cellular and plasma fractions of cord blood after delivery. This study has therefore determined the fundamental quantitative values for the bidirectional fetomaternal cellular and plasma DNA traffic.




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