Objective: We report prenatal diagnosis of hypomethylation at KvDMR1 and Beckwith-Wiedemann syndrome (BWS) in a pregnancy conceived by intracytoplasmic sperm injection (ICSI), in vitro fertilization and embryo transfer (IVF-ET).
Case report: A 34-year-old, primigravid woman was referred to the hospital at 21 weeks of gestation because of advanced maternal age and an isolated omphalocele in the fetus. Her husband had the fertility problems of oligospermia. This pregnancy was achieved by ICSI and IVF-ET. Prenatal ultrasound revealed a 2.1 ´ 1.6 cm isolated omphalocele. The woman underwent amniocentesis. Array comparative genomic hybridization (aCGH) and methylation-specific multiplex ligation-dependent probe amplification (MS-MLPA) were applied on the DNA extracted from the uncultured amniocytes. Conventional cytogenetic analysis and high-resolution melting analysis were performed on cultured amniocytes. aCGH revealed no genomic imbalance. MS-MLPA analysis revealed H19DMR(IC1) normal methylation and KvDMR1(IC2) hypomethylation. Conventional cytogenetic analysis revealed a karyotype of 46,XX. High-resolution melting analysis using a methylation-specific polymerase chain reaction (PCR) assay confirmed normal methylation at H19DMR(IC1) and hypomethylation at KvDMR1(IC2). The altered methylation status at 11p15.5 and the phenotype of omphalocele were consistent with the diagnosis of BWS.
Conclusion: In case of prenatally detected omphalocele associated with an obstetric history of ART, a differential diagnosis of BWS should be considered. Methylation assays such as MS-MLPA and methylation-specific PCR using uncultured amniocytes are useful for rapid diagnosis of BWS under such circumstance.