Carriage of the methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism does not influence the first and second trimester uterine artery Doppler flow.
OBJECTIVE
MTHFR C677T polymorphism is a genetic factor increasing both risk factors for atherosclerotic vascular diseases and obstetric complications like preeclampsia (PE) and fetal growth restriction (FGR). Increased uterine artery impedance, measured by uterine artery Doppler in the second trimester of pregnancy is also associated with PE and FGR. In this study we aimed to analyze whether MTHFR influences first and second trimester uterine artery impedance.


METHODS
In a prospective, controlled, open, single center study of 1955 consecutive singleton pregnant women, smears from buccal gingival cells were analyzed for MTHFR by hybridisation on micro arrays. Uterine artery PI values and unilateral or bilateral diastolic notch were measured at 12 and 22 weeks of gestation. Statistical significance was calculated by the x(2)-test.


RESULTS
MTHFR C677T polymorphism showed a normal distribution in our population. Mean uterine artery Doppler values and bilateral or unilateral notch occurrences from 1697 statistical evaluated women did not show significant differences in any MTHFR genotype (C/C, C/T, T/T) both at 12 or 22 weeks of gestation.


CONCLUSIONS
In summary, the data presented in this adequately powered, prospective, controlled study establish that the MTHFR C677T polymorphism does not influence Doppler flow measurements.
Stonek
Felix
F
Department of Obstetrics and Gynecology, Danube Hospital/SMZ-Ost, Langobardenstrasse 122, 1220 Vienna, Austria. felix.stonek@gmx.at
Hafner
Erich
E
Metzenbauer
Martin
M
Stümpflen
Ingrid
I
Philipp
Karl
K
D005260:Female; D006801:Humans; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D011247:Pregnancy / Q000502:physiology*; D011261:Pregnancy Trimester, First / Q000502:physiology; D011262:Pregnancy Trimester, Second / Q000502:physiology; D011446:Prospective Studies; D012039:Regional Blood Flow; D018615:Ultrasonography, Doppler, Color; D014599:Uterus / Q000098:blood supply* / Q000000981:diagnostic imaging
D042965:Methylenetetrahydrofolate Reductase (NADPH2)