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Abstract
The etiology of gastroschisis remains elusive. A classic twin study was used to assess the relative contribution of environmental and genetic factors in its development. Screening of 4872 twin pregnancies identified three unreported twin pairs comprising two monozygous and one dizygous discordant pair of twins. Review of the literature identified an additional 21 twin pairs. We observed lower pair- and proband-wise concordance rates for monozygotic compared to dizygotic twin pairs, pair- and proband-wise concordance ratios below 1.0. Our results suggest environmental to play a greater role than genetic factors in the development of gastroschisis.
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ACKNOWLEDGMENTS
We thank all patients and their parents for their cooperation. HR is a member of the “Network for the Systematic Investigation of the Molecular Causes, Clinical Implications, and Psychosocial Outcome of Congenital Uro-Rectal Malformations (CURE-Net),” which is supported by a research grant (01GM08107) from the German Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung, BMBF).