An Australian twin study of the genetic basis of preeclampsia and eclampsia

OBJECTIVE: We investigated maternal versus fetal genetic causes of preeclam psia and eclampsia by assessing concordance between monozygotic and dizygot ic female co-twins, between female partners of male monozygotic and dizygot ic twin pairs, and between female twins and partners of their male co-twins in dizygotic opposite-sex pairs. STUDY DESIGN: Two large birth cohorts of volunteer Australian female twin p airs (N = 1504 pairs and N = 858 pairs) were screened and interviewed, and available medical and hospital records were obtained and reviewed where ind icated, with diagnoses assigned according to predetermined criteria. RESULTS: With strict diagnostic criteria used for preeclampsia and eclampsi a, no concordant female twin pairs were found. Collapsing diagnoses of defi nite, probable, or possible preeclampsia or eclampsia resulted in very low genetic recurrence risk estimates. CONCLUSION: Results from these two cohorts of female twin pairs do not supp ort clear, solely maternal genetic influences on preeclampsia and eclampsia . Numbers of parous female partners of male twins were too low for conclusi ons to be drawn regarding paternal transmission.