Urinary miRNA Expression in Pre-Eclampsia During Early and Mid-Pregnancy.

Area of Science:

• Obstetrics and Gynecology
• Molecular Biology
• Biomarker Discovery

Background:

• Pre-eclampsia (PE) affects 2-8% of pregnancies globally, causing significant maternal and fetal complications.
• MicroRNAs (miRNAs) are implicated in pregnancy pathologies, but urinary miRNA profiles in early PE remain understudied.
• Early detection of PE is crucial for improving maternal and fetal outcomes.

Purpose of the Study:

• To investigate urinary miRNA expression profiles in women with pre-eclampsia during the first and second trimesters.
• To identify potential non-invasive urinary biomarkers for early PE detection.
• To explore the role of miRNAs in PE progression during gestation.

Main Methods:

• Prospective study involving 48 urine samples from 24 pregnant women (12 PE, 12 controls).
• Urine collection during the first (9-13 weeks) and second (22-24 weeks) trimesters.
• High-throughput sequencing of urinary miRNAs followed by differential expression and enrichment analyses.

Main Results:

• First trimester: Five miRNAs (hsa-miR-184, hsa-miR-203a-3p, hsa-miR-205-5p, hsa-miR-223-3p downregulated; hsa-miR-1-3p upregulated) were dysregulated in PE.
• Second trimester: hsa-miR-205-5p and hsa-miR-223-3p downregulated; hsa-miR-9-5p, hsa-miR-1-3p, and hsa-miR-206 upregulated in PE.
• Identified specific differentially expressed urinary miRNAs in early pre-eclampsia.

Conclusions:

• Urinary miRNAs are differentially expressed in pre-eclamptic patients during early pregnancy.
• These miRNAs show promise as non-invasive biomarkers for early PE detection and risk assessment.
• Dynamic changes in miRNA expression highlight their role in PE progression, warranting further validation for clinical application.