Hypomethylation at multiple maternally methylated imprinted regions including PLAGL1 and GNAS loci in Beckwith-Wiedemann syndrome

Jet Bliek, Gaetano Verde, Jonathan Callaway, Saskia M. Maas, Agostina De Crescenzo, Angela Sparago, Flavia Cerrato, Silvia Russo, Serena Ferraiuolo, Maria Michela Rinaldi, Rita Fischetto, Faustina Lalatta, Lucio Giordano, Paola Ferrari, Maria Vittoria Cubellis, Lidia Larizza, I. Karen Temple, Marcel M A M Mannens, Deborah J G Mackay, Andrea Riccio

Research output: Contribution to journalArticlepeer-review

Abstract

Genomic imprinting is an epigenetic phenomenon restricting gene expression in a manner dependent on parent of origin. Imprinted gene products are critical regulators of growth and development, and imprinting disorders are associated with both genetic and epigenetic mutations, including disruption of DNA methylation within the imprinting control regions (ICRs) of these genes. It was recently reported that some patients with imprinting disorders have a more generalised imprinting defect, with hypomethylation at a range of maternally methylated ICRs. We report a cohort of 149 patients with a clinical diagnosis of Beckwith-Wiedemann syndrome (BWS), including 81 with maternal hypomethylation of the KCNQ1OT1 ICR. Methylation analysis of 11 ICRs in these patients showed that hypomethylation affecting multiple imprinted loci was restricted to 17 patients with hypomethylation of the KCNQ1OT1 ICR, and involved only maternally methylated loci. Both partial and complete hypomethylation was demonstrated in these cases, suggesting a possible postzygotic origin of a mosaic imprinting error. Some ICRs, including the PLAGL1 and GNAS/NESPAS ICRs implicated in the aetiology of transient neonatal diabetes and pseudohypoparathyroidism type 1b, respectively, were more frequently affected than others. Although we did not find any evidence for mutation of the candidate gene DNMT3L, these results support the hypotheses that trans-acting factors affect the somatic maintenance of imprinting at multiple maternally methylated loci and that the clinical presentation of these complex cases may reflect the loci and tissues affected with the epigenetic abnormalities.

Original languageEnglish
Pages (from-to)611-619
Number of pages9
JournalEuropean Journal of Human Genetics
Volume17
Issue number5
DOIs
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics

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