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Sequence variants identification at the KCNQ1OT1:TSS differentially Methylated region in isolated omphalocele cases.

Abstract：

BACKGROUND:Omphalocele is a congenital midline ventral body wall defect that can exist as isolated malformation or as part of a syndrome. It can be considered one of the major and most frequent clinical manifestation of Beckwith-Wiedemann Syndrome (BWS) in case of loss of methylation at KCNQ1OT1: Transcription Star Site-Differentially Methylated Region (TSS-DMR) or in presence of CDKN1C mutations. The isolated form of the omphalocele accounts approximately for about the 14% of the total cases and its molecular etiology has never been fully elucidated. METHODS:Given the tight relationship with BWS, we hypothesized that the isolated form of the omphalocele could belong to the heterogeneous spectrum of the BWS associated features, representing an endophenotype with a clear genetic connection. We therefore investigated genetic and epigenetic changes affecting BWS imprinted locus at 11p15.5 imprinted region, focusing in particular on the KCNQ1OT1:TSS DMR. RESULTS:We studied 21 cases of isolated omphalocele detected during pregnancy or at birth and identified the following rare maternally inherited variants: i) the non-coding variant G > A at nucleotide 687 (NR_002728.3) at KCNQ1OT1:TSS-DMR, which alters the methylation pattern of the imprinted allele, in one patient; ii) the deletion c.624-629delGGCCCC at exon 1 of CDKN1C, with unknown clinical significance, in two unrelated cases. CONCLUSIONS:Taken together, these findings suggest that KCNQ1OT1:TSS-DMR could be a susceptibility locus for the isolated omphalocele.

journal_name

BMC Med Genet

journal_title

BMC medical genetics

authors

Bedeschi MF,Calvello M,Paganini L,Pezzani L,Baccarin M,Fontana L,Sirchia SM,Guerneri S,Canazza L,Leva E,Colombo L,Lalatta F,Mosca F,Tabano S,Miozzo M

doi

10.1186/s12881-017-0470-z

subject

Has Abstract

pub_date

2017-10-18 00:00:00

pages

115

issue

1

issn

1471-2350

pii

10.1186/s12881-017-0470-z

journal_volume

18

pub_type

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