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Rolv Terje Lie a Division for Medical Statistics, University
of Bergen, Armauer Hansen's Building, Haukeland Hospital,
5021 Bergen, Norway, b Medical Birth Registry
of Norway, Armauer Hansen's Building, Haukeland Hospital,
5021 Bergen, c Statistics Norway, PO Box 8131 Dep, 0033 Oslo, Norway
Correspondence to:
Professor Lie rolv.lie{at}smis.uib.no
Objective: To use familial patterns of recurrence of
pre-eclampsia to investigate whether paternal genes expressed in the
fetus contribute to the mother's risk of pre-eclampsia and whether
mother's susceptibility to pre-eclampsia is related to maternal
inheritance by mitochondrial DNA.
Design: Linked data on pregnancies of different women
who had children with the same father, and subsequently linked data on
pregnancies of half sisters who either had same mother and different
fathers or had same father and different mothers.
Setting: Population based data from the Medical Birth
Registry of Norway covering all births since 1967 (about 1.7 million)
and the Norwegian Central Population Register.
Main outcome measures: Relative risk of pre-eclampsia
after a previous pre-eclamptic pregnancy in the family. Relative risks
approximated by odds ratios.
Results: If a woman becomes pregnant by a man who has
already fathered a pre-eclamptic pregnancy in a different woman her
risk of developing pre-eclampsia is 1.8 (95% confidence interval 1.2 to 2.6). If the woman has a half sister who had pre-eclampsia and with
whom she shares the same mother but different fathers the risk of
pre-eclampsia is 1.6 (0.9 to2.6). If the two sisters have the same
father but different mothers the risk is 1.8 (1.01 to 2.9).
Conclusions: Both the mother and the fetus contribute
to the risk of pre-eclampsia, the contribution of the fetus being affected by paternal genes. Mitochondrial genes, which are transmitted by mothers, do not seem to contribute to the risk.
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