A Genetic Risk Score for Recurrent Miscarriages Based on Polymorphisms in Platelet Glycoproteins and Adhesion...

Area of Science:

• Genetics and Genomics
• Reproductive Medicine
• Thrombophilia Research

Background:

• Recurrent pregnancy loss (RPL) is a complex condition with multifactorial causes.
• Genetic factors, particularly those influencing platelet function and adhesion, are implicated in RPL.
• Investigating combined genetic effects offers a more comprehensive risk assessment.

Purpose of the Study:

• To evaluate the combined impact of polymorphisms in GpIa, GpIIIa, PECAM-1, and P-Selectin genes on the risk of unexplained recurrent pregnancy loss.
• To develop and validate a genetic risk score (GRS) for predicting RPL.
• To assess the GRS performance in specific subgroups, such as younger women and those with late miscarriages.

Main Methods:

• Genotyping of 162 women with primary unexplained RPL and 60 controls for four single nucleotide polymorphisms (SNPs): GpIa-C807T, GpIIIa-PlA1/PlA2, PECAM-1-C373G, and P-Selectin-A37674C.
• Calculation of a genetic risk score (GRS) using dominant and additive models.
• Statistical analysis including logistic regression and receiver operator characteristic (ROC) analyses to determine risk and predictive accuracy.

Main Results:

• An increased risk of miscarriage was significantly associated with the number of polymorphic genes (OR=2.2 per additional SNP).
• The GRS demonstrated predictive value (AUC=0.689), with two or more polymorphic genes showing a sensitivity of 69.8% and specificity of 65% (OR=4.3).
• The GRS showed improved predictive performance in younger patients (<30 years, AUC=0.839) and for late miscarriages (second trimester, AUC=0.742).

Conclusions:

• A genetic risk score based on four specific SNPs shows promise in predicting unexplained recurrent miscarriages.
• The predictive utility of the GRS is particularly notable in younger women and in cases of late pregnancy loss.
• These findings underscore the role of platelet thrombophilia in the etiology of unexplained RPL and suggest potential for targeted genetic screening.