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Epigenetic and genetic alterations of the imprinting disorder Beckwith-Wiedemann syndrome and related disorders.

Abstract：

:Genomic imprinting is an epigenetic phenomenon that leads to parent-specific differential expression of a subset of genes. Most imprinted genes form clusters, or imprinting domains, and are regulated by imprinting control regions. As imprinted genes have an important role in growth and development, aberrant expression of imprinted genes due to genetic or epigenetic abnormalities is involved in the pathogenesis of human disorders, or imprinting disorders. Beckwith-Wiedemann syndrome (BWS) is a representative imprinting disorder characterized by macrosomia, macroglossia and abdominal wall defects, and exhibits a predisposition to tumorigenesis. The relevant imprinted chromosomal region in BWS is 11p15.5, which consists of two imprinting domains, IGF2/H19 and CDKN1C/KCNQ1OT1. BWS has five known causative epigenetic and genetic alterations: loss of methylation (LOM) at KvDMR1, gain of methylation (GOM) at H19DMR, paternal uniparental disomy, CDKN1C mutations and chromosomal rearrangements. Opposite methylation defects, GOM and LOM, at H19DMR are known to cause clinically opposite disorders: BWS and Silver-Russell syndrome, respectively. Interestingly, a recent study discovered that loss of function or gain of function of CDKN1C also causes clinically opposite disorders, BWS and IMAGe (intrauterine growth restriction, metaphyseal dysplasia, adrenal hypoplasia congenita, and genital anomalies) syndrome, respectively. Furthermore, several clinical studies have suggested a relationship between assisted reproductive technology (ART) and the risk of imprinting disorders, along with the existence of trans-acting factors that regulate multiple imprinted differentially methylated regions. In this review, we describe the latest knowledge surrounding the imprinting mechanism of 11p15.5, in addition to epigenetic and genetic etiologies of BWS, associated childhood tumors, the effects of ART and multilocus hypomethylation disorders.

journal_name

J Hum Genet

journal_title

Journal of human genetics

authors

Soejima H,Higashimoto K

doi

10.1038/jhg.2013.51

subject

Has Abstract

pub_date

2013-07-01 00:00:00

pages

402-9

issue

7

eissn

1434-5161

issn

1435-232X

pii

jhg201351

journal_volume

58

pub_type

杂志文章,评审

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