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Summary Background: Plasminogen activator inhibitor 1 (PAI-1) is an inhibitor of fibrinolysis. The PAI-1 4G/5G polymorphism is associated with elevated plasma levels of PAI-1. Over- expression of PAI-1 and impaired fibrinolysis in homozygous carriers of the 4G/4G PAI polymorphism may lead to abnor- mal placental formation and increased risk of fetal loss (FL). The aim of our study was to determine the frequency of this polymorphism in patients with FL in a Serbian population. Methods: The study was carried out in a group of 203 women (91 controls and 112 women with FL). The presence of PAI-1 4G/5G polymorphism was detected by PCR-RFLP analysis. Results: Slightly increased frequency of the PAI-1 4G/4G genotype was observed in the study group compared to the controls (32.1% vs. 30.8%). The frequency of PAI-1 was highest in women experiencing FL in the second trimester of pregnancy (50%), but this difference was not statistically sig- nificant. Conclusions: Our findings suggest that PAI-1 4G/4G might be a risk factor for FL occurring in the second trimester of pregnancy. Further studies are required in order to determine the role of PAI-1 4G/5G polymorphism in the etiology of FL. Kratak sadržaj Uvod: Inhibitor aktivatora plazminogena 1 (PAI-1) igra zna- čajnu ulogu u procesu inhibicije fibrinolize. Pokazano je da je PAI-1 4G/5G polimorfizam povezan sa povišenim nivoom PAI-1 proteina u plazmi. Povećana ekspresija PAI-1 i sma- njena fibrinoliza kod homozigotnih nosilaca PAI-1 4G/5G polimorfizma može dovesti do poremećaja tokom formiranja placente i povećanja rizika za spontane pobačaje (SP). U okviru ove studije analizirali smo učestalost PAI-1 4G/5G polimorfizma kod pacijentkinja sa spontanim pobačajima. Metode: Studija je obuhvatila grupu od 203 žene (91 u kon- trolnoj grupi i 112 žena sa SP). Prisustvo PAI-1 4G/5G poli- morfizama je detektovano PCR-RFLP analizom. Rezultati: Detektovana učestalost homozigotnih nosilaca PAI-1 4G/5G polimorfizma je bila nešto visa u grupi paci- jentkinja u odnosu na kontrolnu grupu (32,1% vs. 30,8%). Najviša učestalost je detektovana kod žena koje su imale SP u drugom trimestru trudnoće (50%), ali ova razlika nije bila statistički značajna. Zaključak: Rezultati naše studije ukazuju da PAI-1 4G/4G može biti faktor rizika za pojavu SP u drugom trimestru trud- noće. Potrebna su dalja ispitivanja u cilju određivanja uloge PAI-1 4G/4G polimorfizma u etiologiji spontanih pobačaja.

journal of medical biochemistry

THE PREVALENCE OF PAI-1 4G/5G POLYMORPHISM IN WOMEN WITH FETAL LOSS – FIRST DATA FOR A SERBIAN POPULATION / UČESTALOST POLIMORFIZMA PAI-1 4G/5G KOD ŽENA SA SPONTANIM POBAČAJEM - PRVI PODACI ZA SRPSKU POPULACIJU