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Congenital abnormalities in two sibs exposed to valproic acid in utero
D Chitayat1, K Farrell, L Anderson
1Department of Medical Genetics, University of British Columbia, Vancouver, Canada.
Insights
Valproic acid (VPA) exposure in utero may cause congenital abnormalities, including craniofacial and skeletal issues. This study observed these effects in siblings exposed to VPA during pregnancy.
Area of Science:
- Developmental Biology
- Teratology
- Clinical Genetics
Background:
- Epilepsy treatment during pregnancy with valproic acid (VPA) is associated with congenital abnormalities.
- The precise mechanisms linking VPA exposure to birth defects remain unclear.
Observation:
- A family with epilepsy presented three siblings, two of whom were exposed to VPA in utero.
- Affected siblings displayed characteristic craniofacial changes and novel skeletal abnormalities.
- Minor anomalies in affected children mirrored those in VPA-exposed rhesus monkeys.
Findings:
- Intrauterine VPA exposure is strongly correlated with specific craniofacial and skeletal malformations.
- The observed abnormalities in siblings suggest a teratogenic effect of VPA.
- Animal model observations support the link between VPA and congenital anomalies.
Implications:
- This study highlights the potential teratogenic risks of valproic acid during pregnancy.
- Further research is needed to elucidate VPA's pathogenetic pathways in congenital abnormalities.
- Clinical vigilance for VPA-associated birth defects in infants is crucial.
Abstract:
Neural tube, craniofacial, and other congenital abnormalities have been described in infants born to mothers with epilepsy who were treated with valproic acid (VPA) during pregnancy. The pathogenetic relationship between the congenital abnormalities and exposure to VPA is not clear. We describe 3 sibs born to a mother with epilepsy. Only the 2 sibs who were exposed to VPA in utero had certain of the characteristic craniofacial changes described in previous reports of children with similar exposure. In addition, the 2 affected children had other craniofacial and skeletal abnormalities which have not been reported previously as teratogenic sequelae of VPA exposure. Many of the minor anomalies present in the 2 affected patients resemble those observed in rhesus monkeys exposed to VPA in utero. This suggests that the abnormalities observed in the 2 children may have been a consequence of intrauterine exposure to VPA.