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Departments of
1
Chemical Pathology and
2 Obstetrics and Gynaecology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, New Territories, Hong Kong SAR.
aAddress correspondence to this author at: Department of Chemical Pathology, The Chinese University of Hong Kong. Prince of Wales Hospital, Shatin, New Territories, Hong Kong SAR. Fax 852-2194-6171; e-mail loym{at}cuhk.edu.hk.
Background: Increased fetal DNA in maternal plasma/serum has been reported in pregnancies complicated by preeclampsia. We hypothesized that impaired clearance of fetal DNA might contribute, at least in part, to the above-mentioned phenomenon.
Methods: We studied 7 preeclamptic and 10 control pregnant women. All had male fetuses. Serial blood samples were obtained from before delivery to 6 h postpartum. Male fetal DNA in maternal plasma was measured by real-time quantitative PCR for the SRY gene on the Y chromosome.
Results: The median fetal DNA concentrations before delivery were significantly higher in the preeclamptic women than in the controls (521 vs 227 genome-equivalents/mL for preeclamptic and control women, respectively; Mann–Whitney rank-sum test, P = 0.017). The median fetal DNA concentrations at 6 h after delivery were also significantly different between the two groups (208 vs 0 genome-equivalents/mL for preeclamptic and control women, respectively; Mann–Whitney rank-sum test, P = 0.002). A first-order clearance model was found to best describe the kinetics of maternal plasma fetal DNA clearance. Moreover, we observed a significant difference in the median apparent clearance half-lives of fetal DNA between the preeclamptic women (114 min) and controls (28 min; Mann–Whitney rank-sum test, P = 0.007).
Conclusions: This study represents the first documentation of impaired fetal DNA clearance from maternal plasma in preeclampsia. Such an abnormality in circulating DNA clearance may also be present in other medical conditions associated with quantitative aberrations in circulating DNA concentrations.
The following articles in journals at HighWire Press have cited this article:
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  Y. Purwosunu, A. Sekizawa, K. Koide, A. Farina, N. Wibowo, G. H. Wiknjosastro, S. Okazaki, H. Chiba, and T. Okai Cell-Free mRNA Concentrations of Plasminogen Activator Inhibitor-1 and Tissue-Type Plasminogen Activator Are Increased in the Plasma of Pregnant Women with Preeclampsia Clin. Chem., March 1, 2007; 53(3): 399 - 404. [Abstract] [Full Text] [PDF]
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R. W.K. Chiu, W.-b. Lui, M.-c. Cheung, N. Kumta, A. Farina, I. Banzola, S. Grotti, N. Rizzo, C. J. Haines, and Y.M. D. Lo Time Profile of Appearance and Disappearance of Circulating Placenta-Derived mRNA in Maternal Plasma Clin. Chem., February 1, 2006; 52(2): 313 - 316. [Abstract] [Full Text] [PDF]
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 Y.M. D. Lo Recent Advances in Fetal Nucleic Acids in Maternal Plasma J. Histochem. Cytochem., March 1, 2005; 53(3): 293 - 296. [Abstract] [Full Text] [PDF]
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M. Hyodo, O. Samura, N. Miharu, K. Ohama, and Y. Kudo Molar DNA in Maternal Serum in a Case of 46,XY Heterozygous Complete Hydatidiform Mole Coexisting with a 46,XX Twin Live Fetus Clin. Chem., March 1, 2005; 51(3): 676 - 677. [Full Text] [PDF]
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 F. Z. Bischoff, D. E. Lewis, and J. L. Simpson Cell-free fetal DNA in maternal blood: kinetics, source and structure Hum. Reprod. Update, January 1, 2005; 11(1): 59 - 67. [Abstract] [Full Text] [PDF]
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 K. Khosrotehrani, T. Wataganara, D. W. Bianchi, and K. L. Johnson Fetal cell-free DNA circulates in the plasma of pregnant mice: relevance for animal models of fetomaternal trafficking Hum. Reprod., November 1, 2004; 19(11): 2460 - 2464. [Abstract] [Full Text] [PDF]
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R. J.P. Rijnders, G. C.M.L. Christiaens, A. A. Soussan, C. E. van der Schoot, P. Invernizzi, G. Simoni, and M. Podda Cell-Free Fetal DNA Is Not Present in Plasma of Nonpregnant Mothers * Authors of the article cited above respond: Clin. Chem., March 1, 2004; 50(3): 679 - 681. [Full Text] [PDF]
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A. Sekizawa, A. Farina, Y. Sugito, R. Matsuoka, M. Iwasaki, H. Saito, and T. Okai Proteinuria and Hypertension Are Independent Factors Affecting Fetal DNA Values: A Retrospective Analysis of Affected and Unaffected Patients Clin. Chem., January 1, 2004; 50(1): 221 - 224. [Full Text] [PDF]
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 Y. Li, X. Y. Zhong, A. Kang, C. Troeger, W. Holzgreve, and S. Hahn Inability to Detect Cell Free Fetal DNA in the Urine of Normal Pregnant Women nor in Those Affected by Preeclampsia Associated HELLP Syndrome Reproductive Sciences, December 1, 2003; 10(8): 503 - 508. [Abstract] [PDF]
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N. Y.L. Lam, T. H. Rainer, L. Y.S. Chan, G. M. Joynt, and Y.M. D. Lo Time Course of Early and Late Changes in Plasma DNA in Trauma Patients Clin. Chem., August 1, 2003; 49(8): 1286 - 1291. [Abstract] [Full Text] [PDF]
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E. K.O. Ng, T. N. Leung, N. B.Y. Tsui, T. K. Lau, N. S. Panesar, R. W.K. Chiu, and Y.M. D. Lo The Concentration of Circulating Corticotropin-releasing Hormone mRNA in Maternal Plasma Is Increased in Preeclampsia Clin. Chem., May 1, 2003; 49(5): 727 - 731. [Abstract] [Full Text] [PDF]
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