title: Transcriptional disruptions in Down syndrome: a case study in the Ts1Cje mouse cerebellum during post-natal development.
abstract: To understand the aetiology and the phenotypic severity of Down syndrome, we searched for transcriptional signatures in a substructure of the brain (cerebellum) during post-natal development in a segmental trisomy 16 model, the Ts1Cje mouse. The goal of this study was to investigate the effects of trisomy on changes in gene expression across development time. The primary gene-dosage effect on triplicated genes (approximately 1.5) was observed at birth [post-natal day 0 (P0)], at P15 and P30. About 5% of the non-triplicated genes were significantly differentially expressed between trisomic and control cerebellum, while 25% of the transcriptome was modified during post-natal development of the cerebellum. Indeed, only 165, 171 and 115 genes were dysregulated in trisomic cerebellum at P0, P15 and P30, respectively. Surprisingly, there were only three genes dysregulated in development and in trisomic animals in a similar or opposite direction. These three genes (Dscr1, Son and Hmg14) were, quite unexpectedly, triplicated in the Ts1Cje model and should be candidate genes for understanding the aetiology of the phenotype observed in the cerebellum.
authors.affiliation: Unité Mixte de Recherche, 7637 Centre National de la Recherche Scientifique, Neurobiology, Paris, France. marie-claude.potier@espci.fr
authors.forename: M-C
authors.initials: MC
authors.lastname: Potier
authors.forename: I
authors.initials: I
authors.lastname: Rivals
authors.forename: G
authors.initials: G
authors.lastname: Mercier
authors.forename: L
authors.initials: L
authors.lastname: Ettwiller
authors.forename: R X
authors.initials: RX
authors.lastname: Moldrich
authors.forename: J
authors.initials: J
authors.lastname: Laffaire
authors.forename: L
authors.initials: L
authors.lastname: Personnaz
authors.forename: J
authors.initials: J
authors.lastname: Rossier
authors.forename: L
authors.initials: L
authors.lastname: Dauphinot
mesh_terms: D000818:Animals; D002531:Cerebellum / Q000254:growth & development* / Q000378:metabolism*; D004195:Disease Models, Animal; D004314:Down Syndrome / Q000235:genetics*; D015870:Gene Expression; D018507:Gene Expression Regulation, Developmental; D006128:Growth / Q000235:genetics; D051379:Mice; D008817:Mice, Mutant Strains; D020411:Oligonucleotide Array Sequence Analysis; D014158:Transcription, Genetic; D014314:Trisomy