(Epi)genotype-phenotype Correlations in Beckwith-Wiedemann Syndrome

Overview

Journal Eur J Hum Genet

Specialty Genetics

Date 2015 Apr 23

PMID 25898929

Citations 67

Authors

Alessandro Mussa

Silvia Russo

Agostina De Crescenzo

Andrea Freschi

Luciano Calzari

Silvia Maitz

Marina Macchiaiolo

Cristina Molinatto

Giuseppina Baldassarre

Milena Mariani

Luigi Tarani

Maria Francesca Bedeschi

Donatella Milani

Daniela Melis

Andrea Bartuli

Maria Vittoria Cubellis

Angelo Selicorni

Margherita Cirillo Silengo

Lidia Larizza

Andrea Riccio

Giovanni Battista Ferrero

Affiliations

Soon will be listed here.

Abstract

Beckwith-Wiedemann syndrome (BWS) is characterized by cancer predisposition, overgrowth and highly variable association of macroglossia, abdominal wall defects, nephrourological anomalies, nevus flammeus, ear malformations, hypoglycemia, hemihyperplasia, and organomegaly. BWS molecular defects, causing alteration of expression or activity of the genes regulated by two imprinting centres (IC) in the 11p15 chromosomal region, are also heterogeneous. In this paper we define (epi)genotype-phenotype correlations in molecularly confirmed BWS patients. The characteristics of 318 BWS patients with proven molecular defect were compared among the main four molecular subclasses: IC2 loss of methylation (IC2-LoM, n=190), IC1 gain of methylation (IC1-GoM, n=31), chromosome 11p15 paternal uniparental disomy (UPD, n=87), and cyclin-dependent kinase inhibitor 1C gene (CDKN1C) variants (n=10). A characteristic growth pattern was found in each group; neonatal macrosomia was almost constant in IC1-GoM, postnatal overgrowth in IC2-LoM, and hemihyperplasia more common in UPD (P<0.001). Exomphalos was more common in IC2/CDKN1C patients (P<0.001). Renal defects were typical of UPD/IC1 patients, uretheral malformations of IC1-GoM cases (P<0.001). Ear anomalies and nevus flammeus were associated with IC2/CDKN1C genotype (P<0.001). Macroglossia was less common among UPD patients (P<0.001). Wilms' tumor was associated with IC1-GoM or UPD and never observed in IC2-LoM patients (P<0.001). Hepatoblastoma occurred only in UPD cases. Cancer risk was lower in IC2/CDKN1C, intermediate in UPD, and very high in IC1 cases (P=0.009). In conclusion, (epi)genotype-phenotype correlations define four different phenotypic BWS profiles with some degree of clinical overlap. These observations impact clinical care allowing to move toward (epi) genotype-based follow-up and cancer screening.

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