Baby’s DNA in mom’s blood may be a warning sign of preeclampsia
New cells in your body are constantly being created while old cells are dying. During this process of cell death (a process called apoptosis), pieces from your old cells can be found floating in your blood- including your DNA. When you are pregnant, this process can also happen to your placenta’s cells as they are created and die- which have your baby’s DNA inside of them. So during pregnancy, doctors and scientists can take a sample of a pregnant woman’s blood and separate out what is called cell free DNA (meaning DNA found floating in the blood, outside a cell). You can also tell the difference between mom’s cell free DNA and the baby’s cell free DNA. Since preeclampsia is often accompanied by a “damaged” placenta- researchers for this study asked if a higher level of baby’s cell free DNA measured in the moms’ blood might be a warning that the placenta could be damaged. If so, this could help predict preeclampsia before any clinical symptoms are present. To answer this question, the researchers enrolled 580 pregnant women and collected their blood in the first, second, and third trimesters. At the end of the study, 20 of these women (out of 580) had developed preeclampsia. The researchers picked 22 similar patients that did not develop preeclampsia and compared the levels of cell free DNA from the baby in the mom’s blood in each trimester for both groups. Researchers found that the cell free DNA levels from the baby were significantly higher in mothers who went on to develop preeclampsia in all three trimesters compared to the mothers that didn’t develop preeclampsia. This study shows that measuring baby’s cell free DNA in a pregnant woman’s blood could be a promising test to predict preeclampsia. More research is needed to study the accuracy of this test in a larger group of patients.
Link: https://pubmed.ncbi.nlm.nih.gov/33475978/
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