Project description:Capitalizing on the massive increase in sample concentrations which are produced by extremely low elution volumes, nano-LC-ESI-MS/MS is currently the most sensitive analytical technology for the comprehensive characterization of complex protein samples. However, despite tremendous technological improvements made in the production and the packing of monodisperse spherical particles for nano-flow HPLC, current state-of-the-art systems still suffer from limits in operation at the maximum potential of the technology. With the recent introduction of the µPAC system, which provides perfectly ordered micro-pillar array based chromatographic support materials, completely new chromatographic concepts for optimization towards the needs of ultra-sensitive proteomics become available. Here we report on a series of benchmarking experiments comparing the performance of a commercially available 50 cm micro-pillar array column to a widely used nano-flow HPLC column for the proteomics analysis of 10 ng tryptic HeLa cell digest. Comparative analysis of LC-MS/MS-data corroborated that micro-pillar array cartridges provide outstanding chromatographic performance and excellent retention time stability, which substantially increase sensitivity in the analysis of low-input proteomics samples, and thus repeatedly yielded almost twice as many unique peptide and unique protein group identifications when compared to conventional nano-flow HPLC columns.
Project description:The filamentous diazotrophic cyanobacteria Trichodesmium spp. supply fixed nitrogen (N) to the N-depleted oligotrophic oceans where their growth is often limited by the low availability of phosphorus(P) and/or iron. Previous studies have mostly been focused on the effects of ocean acidification on Trichodesmium under nutrient sufficient or iron-limited conditions. Only a few studies have examined the impacts of ocean acidification on Trichodesmium grown at low P concentrations using non-steady-state batch cultures. Here we cultured Trichodesmium using P-limited continuous cultures (chemostat) to mimic steady-state oceanic low P condition, and used comparative NGS-derived Trichodesmium transcriptome profiling (RNA-seq) analysis to find differentially expressed genes and cellular pathways in response to acidification.
Project description:RNA-Seq procedure was used for analysis of expression in HEK293T cells. Cells were separately lysed with Trizol reagent (Invotrogen). Total RNA was extracted from cell lysed with Trizol reagent and PureLink RNA Micro Kit (Invitrogen) according to manufacture instruction. RNA quality was checked with BioAnalyser and RNA 6000 Nano Kit (Agilent). Poly(A)+ RNA was purified with Dynabeads® mRNA Purification Kit (Ambion). Illumina library was prepared from poly(A)+RNA with NEBNextNEBNext® Ultra™II RNA Library Prep Kit for Illumina® (NEB) according to manual. Sequencing was performed on HiSeq1500 with 50 bp read length. At least 10 millions of reads were generated for each sample.
Project description:RNA-Seq procedure was used for analysis of expression in melanoma cells. Cells were separately lysed with Trizol reagent (Invotrogen). Total RNA was extracted from cell lysed with Trizol reagent and PureLink RNA Micro Kit (Invitrogen) according to manufacture instruction. RNA quality was checked with BioAnalyser and RNA 6000 Nano Kit (Agilent). Poly(A)+ RNA was purified with Dynabeads® mRNA Purification Kit (Ambion). Illumina library was prepared from poly(A)+RNA with NEBNextNEBNext® Ultra™II RNA Library Prep Kit for Illumina® (NEB) according to manual. Sequencing was performed on HiSeq1500 with 50 bp read length. At least 14.8 millions of reads were generated for each sample.
Project description:RNA-Seq procedure was used for analysis of expression in melanoma cells. Cells were separately lysed with Trizol reagent (Invotrogen). Total RNA was extracted from cell lysed with Trizol reagent and PureLink RNA Micro Kit (Invitrogen) according to manufacture instruction. RNA quality was checked with BioAnalyser and RNA 6000 Nano Kit (Agilent). Poly(A)+ RNA was purified with Dynabeads® mRNA Purification Kit (Ambion). Illumina library was prepared from poly(A)+RNA with NEBNextNEBNext® Ultra™II RNA Library Prep Kit for Illumina® (NEB) according to manual. Sequencing was performed on HiSeq1500 with 50 bp read length. At least 14.8 millions of reads were generated for each sample.
Project description:RNA-Seq procedure was used for analysis of expression in HEK293T cells. Heat shock treatments was performed for 20 min at 43°C. Then heat shock treated cells were incubated for 6 h at 37°C and replicates were separately lysed with Trisol reagent. Total RNA was extracted from cell lysed with Trisol reagent and PureLink RNA Micro Kit (Invitrogen) according to manufacture instruction. RNA Quality was checked with BioAnalyser and RNA 6000 Nano Kit(Agilent). Poly(A)+ RNA was isolated with Dynabeads® mRNA Purification Kit (Ambion). Illumina library was prepared from poly(A)+RNA with NEBNextNEBNext® Ultra™II RNA Library Prep Kit for Illumina® (NEB) according to manual. Sequencing was performed on HiSeq1500 with 50 bp read length.
Project description:To deeply investigate the details of the nano-SiO2 effects, we examined the gene expression profile alterations after nano-SiO2 treatment in BMMCs. The difference analysis between the groups showed that 285 genes were significantly expressed after treatment with nano-SiO2. Compared with the blank group, both nano-SiO2 exposure and DNP-HSA stimulation increased the expression of genes related to the MAPK signaling pathway in mast cells to varying degrees.
Project description:A cross tissue transcriptional comparison of human ILC3 isolated from non-inflamed lymph nodes (LN) and spleens, inflamed tonsils and the peripheral blood (PB). Using uniform gating and high-purity cell-sorting, ILC3 were sorted as Lineage(CD3,CD19,CD34,CD14,CD94)-CD45intCD127+CRTH2-CD117+. From LN, spleen, tonsils and PB, NKp44- ILC3 were isolated and, in addition, NKp44+ ILC3 were sorted from spleen and tonsils. RNA quality was measured on a RNA 6000 Pico Kit (Agilent Technologies) using a 2100 Bioanalyzer (Agilent Technologies). 100 pg high-quality RNA was isolated and cDNA was generated using the SMART-Seq (v3) Ultra Low Input RNA Kit (Clontech) with 15 cycles of amplification. Amplified and Covaris-fragmented cDNA was quality-checked on a High Sensitivity DNA chip (Agilent Technologies) and further processed according the TruSeq Nano DNA Library Preparation Kit (Illumina). Data was processed as follows: SMARTer adapters were trimmed with cutadapt and the resulting sequences were aligned to the human RefSeq transcriptome using 14 TopHat2 (Kim et al., 2013). Normalization and quantification was performed using Cufflinks (Trapnell et al., 2012). FPKM counts were determined per gene with HTSeq-count. Raw data has been deposited at the European Genome-Phenome Archive (www.ebi.ac.uk/ega) under accession EGAS00001002636.