Protective Role of Maternal P.VAL158MET Catechol-O-methyltransferase Polymorphism against Early-Onset Preeclampsia and its Complications

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Background: Up until now there have been contradictory data about the association between p.Val158Met catechol-O-methyltransferase (COMT) polymorphism and risk of preeclampsia (PE). The goal of this study was to assess the potential correlation between p.Val158Met COMT polymorphism and risk of early-onset PE, risk of a severe form of early-onset PE, as well as risk of small-for-gestationalage (SGA) complicating PE.

Methods: The study included 47 early-onset PE patients and 47 control cases. Forty-seven early-onset PE patients were grouped by disease severity (33 patients with a severe form and 14 patients without severe features) and secondly by size for gestational age (12 patients with appropriate-for-gestational-age (AGA) and 35 patients with SGA size). p.Val158Met polymorphism was genotyped by PCR-RFLP analysis.

Results: Allele analysis showed significant difference in COMT allele distribution between early-onset PE and control group as well as early-onset PE SGA and controls (p=0.04057 and p=0.0411 respectively). A statistically significant distribution difference between the severe form and form without severe features of early-onset PE patients was not observed (p>0.05). The highest difference observed was in the allele recessive model where COMT MetMet genotype was associated with decreased risk of early-onset PE (OR=0.281; 95%CI=0.092-0.7836) and PE complications including severe early-onset PE (OR= 0.304; 95%CI=0.086-0.944) and SGA early-onset PE (OR=0.284; 95%CI=0.081-0.874).

Conclusions: COMT may be used as a candidate gene for early-onset PE and its severe form and SGA complications.

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