title: Epimutation of the telomeric imprinting center region on chromosome 11p15 in Silver-Russell syndrome.
abstract: Silver-Russell syndrome (SRS, OMIM 180860) is a congenital disorder characterized by severe intrauterine and postnatal growth retardation, dysmorphic facial features and body asymmetry. SRS is genetically heterogenous with maternal uniparental disomy with respect to chromosome 7 occurring in approximately 10% of affected individuals. Given the crucial role of the 11p15 imprinted region in the control of fetal growth, we hypothesized that dysregulation of genes at 11p15 might be involved in syndromic intrauterine growth retardation. We identified an epimutation (demethylation) in the telomeric imprinting center region ICR1 of the 11p15 region in several individuals with clinically typical SRS. This epigenetic defect is associated with, and probably responsible for, relaxation of imprinting and biallelic expression of H19 and downregulation of IGF2. These findings provide new insight into the pathogenesis of SRS and strongly suggest that the 11p15 imprinted region, in addition to those of 7p11.2-p13 and 7q31-qter, is involved in SRS.
authors.affiliation: Laboratoire d'Explorations Fonctionnelles Endocriniennes, Inserm U515 et UPMC Paris 6, Hôpital Armand Trousseau, AP-HP, 26 avenue Arnold Netter, 75012 Paris, France. christine.gicquel@trs.aphp.fr
authors.forename: Christine
authors.initials: C
authors.lastname: Gicquel
authors.forename: Sylvie
authors.initials: S
authors.lastname: Rossignol
authors.forename: Sylvie
authors.initials: S
authors.lastname: Cabrol
authors.forename: Muriel
authors.initials: M
authors.lastname: Houang
authors.forename: Virginie
authors.initials: V
authors.lastname: Steunou
authors.forename: Véronique
authors.initials: V
authors.lastname: Barbu
authors.forename: Fabienne
authors.initials: F
authors.lastname: Danton
authors.forename: Nathalie
authors.initials: N
authors.lastname: Thibaud
authors.forename: Martine
authors.initials: M
authors.lastname: Le Merrer
authors.forename: Lydie
authors.initials: L
authors.lastname: Burglen
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Bertrand
authors.forename: Irène
authors.initials: I
authors.lastname: Netchine
authors.forename: Yves
authors.initials: Y
authors.lastname: Le Bouc
mesh_terms: D000076246:CCCTC-Binding Factor; D002880:Chromosomes, Human, Pair 11 / Q000235:genetics*; D019175:DNA Methylation; D004268:DNA-Binding Proteins / Q000235:genetics; D005317:Fetal Growth Retardation; D018392:Genomic Imprinting / Q000235:genetics*; D006130:Growth Disorders / Q000235:genetics* / Q000503:physiopathology; D006801:Humans; D007335:Insulin-Like Growth Factor II; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics*; D011401:Promoter Regions, Genetic / Q000235:genetics; D011506:Proteins / Q000235:genetics; D062085:RNA, Long Noncoding; D022661:RNA, Untranslated / Q000235:genetics; D012097:Repressor Proteins / Q000235:genetics; D013577:Syndrome; D016615:Telomere
chemical_list: D000076246:CCCTC-Binding Factor; C000619697:CTCF protein, human; D004268:DNA-Binding Proteins; C094335:H19 long non-coding RNA; C035170:IGF2 protein, human; D011506:Proteins; D062085:RNA, Long Noncoding; D022661:RNA, Untranslated; D012097:Repressor Proteins; D007335:Insulin-Like Growth Factor II