Reprogramming to pluripotency after overexpression of OCT4, SOX2, KLF4 and MYC is accompanied by global genomic and epigenomic changes. Histone modification and DNA methylation states in iPSCs have been shown to be highly similar with embryonic stem cells (ESCs). However, epigenetic differences still exist between iPSCs and ESCs. In particular, aberrant DNA methylation states found in iPSCs are a major concern for using iPSCs in a clinical setting. Thus, it is critical to find factors that regulate DNA methylation states in reprogramming. Here, we found that the miR-29 family is an important epigenetic regulator during human somatic cell reprogramming. Our global DNA methylation and hydroxymethylation analysis shows that DNA demethylation is a major event mediated by miR-29a depletion during early reprogramming, and that iPSCs derived from miR-29a depletion are epigenetically closer to ESCs. Our findings uncover an important miRNA-based approach to generate clinically robust iPSCs. Overall design: Bisulphite converted gDNAs of D551 fibroblasts transduced for 3 days with overexpression of DNMTs, TETs, TDG and OSKM or miR29a/b/c and control sponge were hybridized into Illumina Infinium HumanMethylation 450K Beadchip.
Regulation of the DNA Methylation Landscape in Human Somatic Cell Reprogramming by the miR-29 Family.
Specimen part, Treatment, SubjectView Samples
The pancreatic beta cell function failure is the core event of type 2 diabetes mellitus. High levels of free fatty acid and glucose are two main factor that induced pancreatic beta cell function failure. Long term exposure to palmitate can induced pancreatic beta cell apoptoss and impaired insulin secretion in vivo and in vitro, called lipotoxicity. The lipotoxicity often coupled with high glucose, their combination form called glucolipotoxcity. We carried out temporal transcriptome and proteome studies investigating the evolution of molecular events in Ins1 cells stimulated by palmitate for different times. And through compared the transcriptome and proteome between lipotoxicity and glucolipotoxicity explain the mechanism of glucolipotoxicity more harmfull to beta cell. Overall design: we performed a time-course large-scale transcriptome of INS1 cells induced by 0.5 mM palmitate and 0.5 mM palmitate with 27.8 mM glucose at four time points (8, 16, 24 and 48 h) using MAPS method
Temporal Proteomic Analysis of Pancreatic β-Cells in Response to Lipotoxicity and Glucolipotoxicity.
Specimen part, Cell line, Subject, TimeView Samples
Compare with normal nasopharyngeal epithelial cells, we found ACAT1 was decreased in NPC cells, we found that ACAT1 inhibited proliferation, colony formation, migration and invasion in NPC cells. We used microarrays to identify differential genes regulated by ACAT1 in NPC cell lines.
Epigenetic Inactivation of Acetyl-CoA Acetyltransferase 1 Promotes the Proliferation and Metastasis in Nasopharyngeal Carcinoma by Blocking Ketogenesis.
Cell line, TreatmentView Samples
In order to study the function of CHR729 in rice, the T-DNA insertion mutant of CHR729 was obtained and analysed.
CHD3 protein recognizes and regulates methylated histone H3 lysines 4 and 27 over a subset of targets in the rice genome.
Age, Specimen partView Samples
The oscillation status of the circadian clock during late gestation is not clear. To gain a better understanding on the oscillation state of the clock and possible influences by maternal cues, we performed transcriptome analyses on the fetal liver tissue during late gestation.
Circadian rhythms of fetal liver transcription persist in the absence of canonical circadian clock gene expression rhythms in vivo.
Specimen part, TimeView Samples
Novel analytic tools are needed to elucidate the molecular basis of leukemia-relevant gene mutations in the post-genome era. We generated isogenic leukemia cell clones in which the FLT3 gene was disrupted in a single allele using TALENs. Isogenic clones with mono-allelic disrupted FLT3 were compared to an isogenic wild-type control clone and parental leukemia cells for transcriptional expression, downstream FLT3 signaling and proliferation capacity. The global gene expression profiles of mutant K562 clones and corresponding wild-type controls were compared using RNA-seq. The transcriptional levels and the ligand-dependent autophosphorylation of FLT3 were decreased in the mutant clones. TALENs-mediated FLT3 haplo-insufficiency impaired cell proliferation and colony formation in vitro. These inhibitory effects were maintained in vivo, improving the survival of NOD/SCID mice transplanted with mutant K562 clones. Cluster analysis revealed that the gene expression pattern of isogenic clones was determined by the FLT3 mutant status rather than the deviation among individual isogenic clones. Differentially expressed genes between the mutant and wild-type clones revealed an activation of nonsense-mediated decay pathway in mutant K562 clones as well as an inhibited FLT3 signaling. Our data support that this genome-editing approach is a robust and generally applicable platform to explore the molecular bases of gene mutations. Overall design: Global gene expression profiles of three isogenic K562 mutant clones (clones k20, k112, k324) and three randomly selected wild-type clones (clones kw1, kw2, kw3) were generated by RNA-seq, using Illumina Hiseq 2000.
TALENs-mediated gene disruption of FLT3 in leukemia cells: Using genome-editing approach for exploring the molecular basis of gene abnormality.
No sample metadata fieldsView Samples
Progressive reductions in ß-cell mass and function comprise the core of the pathogenesis mechanism leading to type 2 diabetes (T2D). To understand the molecular events in this process, we quantified the temporal transcriptome and proteome of pancreatic islets from Goto-Kakizaki (GK) rats at different stages of diabetes. Integrated omics analysis allowed us to unravel the chronological order of T2D-related molecular events during GK islet deterioration. Two major events occur early in the disease, specifically, a reduction in ß-cell mass caused by defective neogenesis and senescence-related low proliferation, and metabolic shift caused by mitochondrial dysfunction. Furthermore, our data revealed the evolution of compensation failure in GK islets and two distinct stages of islet inflammation: priming and amplification. Our study offers a valuable resource for the diabetes research community and will facilitate further studies aimed at protecting ß-cell mass and function. Overall design: We performed a time-course large-scale transcriptome of pancreatic islets in GK male rats vs control, age-matched WST male rats at five time points (week 4, 6, 8, 16 and 24) using MAPS method
Temporal Transcriptomic and Proteomic Landscapes of Deteriorating Pancreatic Islets in Type 2 Diabetic Rats.
No sample metadata fieldsView Samples
we report the RNA-seq based analyses of the transcriptional changes in the Anopheles gambiae mosquitoes from East Africa classified as deltamethrin-resistant or -suscpetible accordign the WHO test Overall design: comparison of the transcriptome of Anopheles gambiae mosquitoes with phenotypically resistant or suscpetible to deltamethrin
Comparative transcriptome analyses of deltamethrin-resistant and -susceptible Anopheles gambiae mosquitoes from Kenya by RNA-Seq.
CD8+ NKT cells are naturally occurring but rare T cells that express both T cell and natural killer (NK) cell markers. These cells may play key roles in establishing tolerance to self antigens; however, the mechanism of action and the molecular profiles of these cells are poorly characterized due to their extremely low frequencies. We developed a highly efficient in vitro conversion/expansion protocol for such cells and extensively characterized their functional and molecular phenotypes using a variety of genomic and immunological techniques.
The IL-10 and IFN-gamma pathways are essential to the potent immunosuppressive activity of cultured CD8+ NKT-like cells.
No sample metadata fieldsView Samples