Project description:Treatment with vitamin C (Vc) on MaF pre-induced pluripotent stem cells (pre-iPSCs) induced a rapid conversion into full-iPSCs within a few passages. We used microarrays to identify changes induced by Vc in the MaF pre-iPSC clone.
2010-01-31 | GSE19378 | GEO
Project description:DNA microarrays time course of SKO-infected MEFs and MaF pre-iPSCs treated with Vc
Project description:Amyotrophic lateral sclerosis (ALS) is a severe neurodegenerative condition characterized by loss of motor neurons in the brain and spinal cord. Expansions of a hexanucleotide repeat (GGGGCC) in the noncoding region of the C9ORF72 gene are the most common cause of the familial form of ALS (C9-ALS), as well as frontotemporal lobar degeneration and other neurological diseases. How the repeat expansion causes disease remains unclear, with both loss of function (haploinsufficiency) and gain of function (either toxic RNA or protein products) proposed. We report a cellular model of C9-ALS with motor neurons differentiated from induced pluripotent stem cells (iPSCs) derived from ALS patients carrying the C9ORF72 repeat expansion. No significant loss of C9ORF72 expression was observed, and knockdown of the transcript was not toxic to cultured human motor neurons. Transcription of the repeat was increased, leading to accumulation of GGGGCC repeat–containing RNA foci selectively in C9-ALS iPSC-derived motor neurons. Repeat-containing RNA foci colocalized with hnRNPA1 and Pur-?, suggesting that they may be able to alter RNA metabolism. C9-ALS motor neurons showed altered expression of genes involved in membrane excitability including DPP6, and demonstrated a diminished capacity to fire continuous spikes upon depolarization compared to control motor neurons. Antisense oligonucleotides targeting the C9ORF72 transcript suppressed RNA foci formation and reversed gene expression alterations in C9-ALS motor neurons. These data show that patient-derived motor neurons can be used to delineate pathogenic events in ALS. Transcriptome profiling from iPSC derived motor neurons compared to controls
Project description:In vitro time course experiment using the A404 clone of P19 mouse embryonal carcinoma cells to evaluate SMC differentiation in response to retinoic acid followed by phenotype-specific selection with puromycin. Four time points of 5-6 biological replicates each were performed. Keywords: time-course
Project description:Using kinetic gene expression analysis of regenerated epidermis over a 7 day time-course, we identify a lncRNA-transription factor network with the MAF/MAFB transcription factors as central players in directing the epidermal differentiation program.
