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Age-related epigenetic drift in the pathogenesis of MDS and AML part 2

ABSTRACT: Genomic DNA is isolated from spleen (RUNX1 model and normal control) and bone marrow (NHD13 model and normal control). We used MCAM to identify genes that have methylation changes.

ORGANISM(S): Mus musculus

PROVIDER: GSE46065 | GEO | 2014/01/09

SECONDARY ACCESSION(S): PRJNA197147

REPOSITORIES: GEO

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Project description:Genomic DNA is isolated from spleen (RUNX1 model and normal control) and bone marrow (NHD13 model and normal control). We used MCAM to identify genes that have methylation changes. Two-condition experiment, MDS model mouse vs. normal control.

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Next Generation Sequencing Facilitates Quantitative Analysis of Wild Type (WT) HSCs and NHD13+ MDS HSCs Transcriptomes

Project description:Purpose: Next-generation sequencing (NGS) has revolutionized systems-based analysis of cellular pathways. To determine the molecular mechanism of severe cytopenia in NHD13+ Tg mice, we purified Lin-Sca-1+c-Kit+CD34-Flt3-CD150+ HSCs from WT and NHD13+Tg mice at 4 month of age and perform the RNA-seq analysis. Methods: Trizol was used to extract RNA from FACS sorted CD150+CD34–Flt3–LSK viable cells. Total RNA was used for quality controls and for normalization of starting material. cDNA-libraries were generated with 10 ng of total RNA using the SMARTer Ultra Low RNA Kit for Illumina Sequencing according to the manufacturer’s indications. Sequencing was done using the Illumina Next-Gen Sequencing HiSeq platform with 30-45 million 75bp, paired-end reads. Results: We found 597 genes with significantly differential expression in NHD13+ HSCs, compared to WT controls (p<0.001). The expression of NUP98-HOXD13 up-regulated the expression of HOX genes, including Hoxa3, Hoxa5, Hoxa7, Hoxa9, Hoxb6, Hoxc5, Hoxc6, Hoxc8, Hoxc9 and Hoxd3, the important myeloid transcription factor Pbx3, cell cycle regulators, Cdk6 and Cdc25C, as well as the transcripts encoding the Ly6d surface membrane protein. We then performed pathway analyses, which showed that DNA duplication, DNA damage response and cell cycle-related genes, were more highly expressed in NHD13+ HSCs than WT HSCs, while multiple metabolic process-related gene pathways were downregulated. Conclusions: Our analyses demonstrate that the gene expression signature defined in murine NHD13+ MDS HSCs displays robust similarities with the gene expression profiles of human MDS cells, strongly suggesting that this murine MDS model can be used to accurately model human MDS.

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