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Study details paired risk factors in preeclampsia
Date:9/10/2013

PROVIDENCE, R.I. [Brown University] Although preeclampsia occurs in about 3 percent of pregnancies, it's still unforeseen in many cases. A report of new research, now in press at the Journal of Reproductive Immunology, documents how two distinct risk factors combine to affect the odds that a first-time mother could develop the sometimes life-threatening pregnancy complication. The findings suggest there could be new ways to plan pregnancy with improved awareness and management of the risk.

For years evidence has mounted that preeclampsia may have its origin in the mother's immune response to pregnancy. For that reason, researchers have been studying the potential role of two risk factors: the level of similarity between the mother and father or mother and fetus in a set of five human leukocyte antigen (HLA) genes related to immune system compatibility; and the degree of vaginal exposure the mother has had to the father's semen before becoming pregnant.

The new study, first published online in August, measured both of those risk factors in detail and in combination in 118 women who developed preeclampsia and in 106 similar women who did not. The data set came from SOPHIA, the Study of Pregnancy Hypertension in Iowa maintained by the University of Iowa.

The study's main finding is that women who have had relatively little prior vaginal exposure to the father's semen and who had a high-level of matching of the class I group of three HLA genes had 4.5 times greater odds of developing preeclampsia than women with greater exposure and less gene matching. The analysis accounted for other risk factors, such as Body Mass Index.

"When you have both low seminal fluid exposure and high sharing [of Class I HLA genes], you are at highest risk," said study lead and corresponding author Elizabeth Triche, assistant professor of epidemiology in Brown University's School of Public Health.

The increased odds appear to confirm pr
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Contact: David Orenstein
david_orenstein@brown.edu
401-863-1862
Brown University
Source:Eurekalert

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