title: Role of histone acetylation and DNA methylation in the maintenance of the imprinted expression of the H19 and Igf2 genes.
abstract: H19 and Igf2 are linked and reciprocally imprinted genes. We demonstrate that the histones associated with the paternally inherited and unexpressed H19 allele are less acetylated than those associated with the maternal expressed allele. Cell growth in the presence of inhibitors of either histone deacetylase or DNA methylation activated the silent Igf2 allele, whereas derepression of the silent H19 allele required combined inhibition of DNA methylation and histone deacetylation. Our results indicate that histone acetylation as well as DNA methylation contribute to the somatic maintenance of H19 and Igf2 imprinting and that silencing of the imprinted alleles of these two genes is maintained via distinct mechanisms.
authors.affiliation: Dipartimento di Scienze Ambientali, Seconda Università degli Studi di Napoli, Caserta, Italy.
authors.forename: P V
authors.initials: PV
authors.lastname: Pedone
authors.forename: M J
authors.initials: MJ
authors.lastname: Pikaart
authors.forename: F
authors.initials: F
authors.lastname: Cerrato
authors.forename: M
authors.initials: M
authors.lastname: Vernucci
authors.forename: P
authors.initials: P
authors.lastname: Ungaro
authors.forename: C B
authors.initials: CB
authors.lastname: Bruni
authors.forename: A
authors.initials: A
authors.lastname: Riccio
mesh_terms: D000107:Acetylation; D000483:Alleles; D000818:Animals; D002478:Cells, Cultured; D002843:Chromatin / Q000378:metabolism; D019175:DNA Methylation; D005220:Fathers; D005260:Female; D005347:Fibroblasts / Q000378:metabolism; D005786:Gene Expression Regulation; D018392:Genomic Imprinting; D006657:Histones / Q000378:metabolism*; D007335:Insulin-Like Growth Factor II / Q000235:genetics*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D009035:Mothers; D009124:Muscle Proteins / Q000235:genetics*; D009707:Nucleosomes / Q000378:metabolism; D062085:RNA, Long Noncoding; D022661:RNA, Untranslated; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D002843:Chromatin; C094335:H19 long non-coding RNA; D006657:Histones; D009124:Muscle Proteins; D009707:Nucleosomes; D062085:RNA, Long Noncoding; D022661:RNA, Untranslated; D007335:Insulin-Like Growth Factor II