Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Expression data from Ts1Cje and disomic C57BL/6 adult neurospheres

ABSTRACT: Down syndrome is the most common form of genetic mental retardation. How Trisomy 21 causes mental retardation remains unclear and its effects on adult neurogenesis have not been addressed. To gain insight into the mechanisms causing mental retardation we used microarrays to investigate gene expression differences between Ts1Cje (a mouse model of Down syndrome) and C57BL/6 littermate control neurospheres. The neurospheres were generated from neural stem cells and progenitors isolated from the lateral walls of the lateral ventricles from adult mice. RNA was extracted for hybridization to arrays from 3 pairs of Ts1Cje and disomic C57BL/6 littermate control 7-day old adult neurosphere cultures.

ORGANISM(S): Mus musculus

SUBMITTER: Chelsee Hewitt

PROVIDER: E-GEOD-17760 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Gene network disruptions and neurogenesis defects in the adult Ts1Cje mouse model of Down syndrome.

Hewitt Chelsee A CA Ling King-Hwa KH Merson Tobias D TD Simpson Ken M KM Ritchie Matthew E ME King Sarah L SL Pritchard Melanie A MA Smyth Gordon K GK Thomas Tim T Scott Hamish S HS Voss Anne K AK

PloS one 20100716 7

<h4>Background</h4>Down syndrome (DS) individuals suffer mental retardation with further cognitive decline and early onset Alzheimer's disease.<h4>Methodology/principal findings</h4>To understand how trisomy 21 causes these neurological abnormalities we investigated changes in gene expression networks combined with a systematic cell lineage analysis of adult neurogenesis using the Ts1Cje mouse model of DS. We demonstrated down regulation of a number of key genes involved in proliferation and cel ...[more]

PMID: 20661276

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Project description:Cotton (Gossypium hirsutum L.) fibres are specialised trichomes that extend from the seedcoat. To date only a few genes directly involved in the differentiation of these epidermal cells have been identified. We have identified a HD-ZIP transcription factor, GhHD-1, expressed in trichomes and early fibres that might play a role in cotton fibre initiation. Here we characterise GhHD-1 from G. hirsutum and show, using reporter constructs and qRT-PCR, that they are expressed predominantly in epidermal tissues during early fibre development and in other tissues bearing epidermal trichomes. GhHD-1 silencing caused reduced trichome formation and delayed the timing of fibre initiation whereas constitutive over-expression of GhHD-1 increased the number of fibres initiating on the seed, but did not affect leaf trichomes. Expression of GhHD-1 in transgenic cotton silenced for different fibre MYBs suggest that in ovules it acts downstream of GhMYB25-like. Microarray analysis of silencing and over-expression lines of GhHD-1 indicated that it potentially functions through a WRKY transcription factor and calcium-signalling pathway genes that are shared with some biotic stress reactions. Microarray analysis of 2 biological replicates each of GhHD-1 silenced and over-expression transgenic lines relative to wild-type were used to identify downstream targets of this transcription factor during early fibre development. 0 dpa (Days post anthesis) ovules from GhHD-1 silenced and over-expression lines and wild-type cotton plants were selected for RNA extraction and hybridisation on Affymetrix cotton arrays. Cotton fibre development initiates on the epidermal surface of each ovule within a cotton boll on the day of flowering and GhHD-1 has been shown to be most highly expressed at this stage (0 dpa). Ovules were obtained from 0dpa flowers for hybridisation to cotton arrays to identify genes that may be regulated by GhHD-1 during this early fibre development stage (initiation).

Dataset Information

Expression data from Ts1Cje and disomic C57BL/6 adult neurospheres

Publications

Gene network disruptions and neurogenesis defects in the adult Ts1Cje mouse model of Down syndrome.

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