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Placenta-mediated complications: Nucleosomes and free DNA concentrations differ depending on subtypes
Sylvie Bouvier1,2,3, Eve Mousty4, Mathieu Fortier1
1Department of Haematology, CHU Nimes, Univ Montpellier, Nîmes, France.
Nucleosomes and cell-free DNA (fDNA) levels rise in normal pregnancy. These biomarkers are elevated in placenta-mediated complications, with higher concentrations in preeclampsia than intrauterine growth restriction.
Area of Science:
- Obstetrics and Gynecology
- Maternal-Fetal Medicine
- Biochemistry
Background:
- Placenta-mediated pregnancy complications lead to adverse maternal and fetal outcomes.
- Nucleosomes and cell-free DNA (fDNA) are associated with inflammatory conditions.
Purpose of the Study:
- To compare circulating nucleosome and fDNA levels during pregnancy.
- To investigate these levels in women with placenta-mediated complications, specifically preeclampsia and intrauterine growth restriction.
Main Methods:
- Prospective study of 115 women: 30 non-pregnant, 50 normal pregnancy, 35 complicated pregnancy.
- Blood samples collected up to every 4 weeks.
- Nucleosomes and fDNA quantified using ELISA and qPCR.
Main Results:
- Nucleosome and fDNA concentrations significantly increase during normal pregnancy.
- Concentrations at delivery differ between normal and complicated pregnancies.
- Higher nucleosome and fDNA levels observed in preeclampsia compared to intrauterine growth restriction.
Conclusions:
- Nucleosomes and fDNA levels change during normal pregnancy.
- Elevated nucleosomes and fDNA suggest their involvement in placenta-mediated pregnancy complications.
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