The interrelation between the high expression level of MIR34a and the trisomic abortion materials

Area of Science:

• Reproductive biology
• Epigenetics
• Genetics

Background:

• Spontaneous abortions have complex and varied causes.
• Epigenetic factors, such as micro-ribonucleic acids (miRNAs), may influence pregnancy loss.
• Understanding the molecular mechanisms of miscarriage is crucial for improving reproductive outcomes.

Purpose of the Study:

• To investigate differences in placental miRNA expression between spontaneous abortions with normal and abnormal karyotypes.
• To evaluate specific inhibitor and activator miRNAs in relation to abortion causes and maternal age.

Main Methods:

• A case-control study involving 100 spontaneous abortion samples (disomies, aneuploidies, triploidies).
• Quantitative real-time polymerase chain reaction (qRT-PCR) was used to measure miRNA expression levels.
• Expression of MIR378a-5p, MIR376c, MIR195, MIR34a, and MIR210 was assessed relative to MIR130.

Main Results:

• Placental inhibitor MIR34a expression was significantly higher in trisomic abortion materials (trisomy 16 and 21) compared to disomic controls.
• MIR195 and MIR34a expression levels were elevated in numerically abnormal cases associated with advanced maternal age.

Conclusions:

• High MIR34a expression appears interrelated with trisomic spontaneous abortions.
• Advanced maternal age may exacerbate the effect of MIR34a in trisomic pregnancy losses.