The aim has been to use DNA from
case and control dyads (mother and child) in MoBa to
genotype polymorphic genetic markers (single nucleotide
polymorphisms – SNPs) in metabolic pathways in
which tobacco might have an influence. The aims have
now been extended to include the complete genome, in
a GWAS study. If the genetic analyses can point to
new genes that reveal important pathophysiological
mechanisms, it may lead to the development of better
therapies. As part of this project, an association study
between smoking and pre-eclampsia was performed.
Exposure to tobacco was based on responses to two
questionnaires, sent to the pregnant women in gestational
weeks 15 to 17 and week 30, while the information
on pre-eclampsia was derived from the birth record in
the Medical Birth Registry of Norway. It was found
that, whereas 23% of the pregnant women reported
smoking in the first trimester, only 9 and 8% smoked
in the second and third trimester, respectively [4]. The
main finding was that the risk of pre-eclampsia was
only reduced for women who continued to smoke in
the third trimester (adjusted OR = 0.57, 95% CI: 0.46-
0.70). Women who quit smoking before the last trimester
had about the same risk as non-smokers. No
effect of passive smoking could be found. Thus, this
observation confirms earlier reports of the apparent
protective effect of smoking, but limits the effect to
smoking in the last trimester.
The aim has been to use DNA fromcase and control dyads (mother and child) in MoBa togenotype polymorphic genetic markers (single nucleotidepolymorphisms – SNPs) in metabolic pathways inwhich tobacco might have an influence. The aims havenow been extended to include the complete genome, ina GWAS study. If the genetic analyses can point tonew genes that reveal important pathophysiologicalmechanisms, it may lead to the development of bettertherapies. As part of this project, an association studybetween smoking and pre-eclampsia was performed.Exposure to tobacco was based on responses to twoquestionnaires, sent to the pregnant women in gestationalweeks 15 to 17 and week 30, while the informationon pre-eclampsia was derived from the birth record inthe Medical Birth Registry of Norway. It was foundthat, whereas 23% of the pregnant women reportedsmoking in the first trimester, only 9 and 8% smokedin the second and third trimester, respectively [4]. Themain finding was that the risk of pre-eclampsia wasonly reduced for women who continued to smoke inthe third trimester (adjusted OR = 0.57, 95% CI: 0.46-0.70). Women who quit smoking before the last trimesterhad about the same risk as non-smokers. Noeffect of passive smoking could be found. Thus, thisobservation confirms earlier reports of the apparentprotective effect of smoking, but limits the effect tosmoking in the last trimester.
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