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6 protocols using rta software version 2

1

Illumina NextSeq 500 RNA Sequencing Protocol

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Libraries were prepared using TruSeq stranded RNA reagents (Illumina, USA) according to manufacturer’s instructions, using 500 ng of total RNA input per sample with dual indexing to enable all libraries to be sequenced in the same run. Pooled libraries were sequenced on four runs of an Illumina NextSeq 500 instrument with 75 bp single end reads. Image analysis and base calling were performed using Illumina’s RTA software version 2.4.11 and bcl2fastq version 2.18.0.12. Reads were filtered to remove those with low base call quality using Illumina’s default chastity criteria. Raw sequence data were deposited in Sequence Read Archive under Bioproject number PRJNA437839.
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2

RNA Isolation and Sequencing of Chalimus Larvae

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RNA was isolated as described before [37 (link)]. In brief, pools of four or five chalimus larvae were homogenized in TRI reagent and mixed with chloroform (both Merck, Darmstadt, Germany). The upper aqueous phase was aspirated and further purified using an RNeasy Micro Kit (Qiagen, Hilden, Germany) for RNA isolation according to the manufacturers’ instructions. RNA was stored at − 80 °C until use. Library preparation and RNA-sequencing were conducted by the Norwegian Sequencing Centre, Oslo, as previously described [27 (link)]. Briefly, sequencing libraries were prepared from 0.5 µg total RNA using the TruSeq stranded mRNA reagents (Illumina, San Diego, USA). Indexed libraries were blended into a single pool and sequenced during three runs of a NextSeq 500 instrument (Illumina) using 76-bp single end reads. Image analysis and base calling were performed using Illumina’s RTA software version 2.4.11, and data were converted to FASTQ format using bcl2fastq version 2.17.1.14. Raw sequencing data were deposited in the NCBI database under BioProject ID PRJNA577842.
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3

Transcriptomic Analysis of FTZ-F1 Knockdown

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Nauplii I larvae originating from the same pair of eggstrings were divided into three groups and treated with 2500 ng dsRNA of either αFTZ-F1, βFTZ-F1 or CPY185 (control). About 50 larvae from each group were transferred to RNAlater™ (Ambion) 48 hours after molting from nauplius I to nauplius II, and the remaining larvae were left to molt again and develop to copepodids. This experiment was repeated three times, producing three biological parallels per dsRNA treatment. Total RNA extracted from dsRNA treated larvae were sequenced at the Genomics Core Facility, University of Bergen. Sequencing libraries were prepared from 400 ng total RNA using Illumina® TruSeq® mRNA Stranded Sample Preparation kit. Samples were barcoded, pooled together and sequenced in a single lane using the Illumina HiSeq4000 (Illumina, Inc., San Diego, CA, USA), producing 2x75 base pair (bp) paired end reads. Image analysis and base calling were performed using Illumina’s RTA software version 2.4.11, and the data was converted to fastQ format using bcl2fastq version 2.1.7.1.14.
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4

RNA-seq Analysis of Mouse Alveolar Macrophages

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Total RNA from in vitro cultured AMs was extracted using RNeasy Plus Mini Kit (QIAGEN) following the manufacture’s protocol. Two pools per genotype were used for RNA-seq. After quality control, high quality (Agilent Bioanalyzer RIN > 7.0) total RNA was used to generate the RNA sequencing library. cDNA synthesis, end-repair, A-base addition, and ligation of the Illumina indexed adapters were performed according to the TruSeq RNA Sample Prep Kit v2 (Illumina, San Diego, CA). The concentration and size distribution of the completed libraries was determined using an Agilent Bioanalyzer DNA 1000 chip (Santa Clara, CA) and Qubit fluorometry (Invitrogen, Carlsbad, CA). Paired-end libraries were sequenced on an Illumina HiSeq 4000 following Illumina’s standard protocol using the Illumina cBot and HiSeq 3000/4000 PE Cluster Kit. Base-calling was performed using Illumina’s RTA software (version 2.5.2). Paired-end RNA-seq reads were aligned to the mouse reference genome (GRCm38/mm10) using Bowtie (v2.3.4). Pre- and post-alignment quality controls, gene level raw read count and normalized read count (i.e., FPKM) were performed using RSeQC package (v2.3.6) with NCBI mouse RefSeq gene model. Differential expression for each gene between various groups specified in the text was identified by Cuffdiff (Trapnell et al., 2010 (link)).
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5

RNA-Seq Protocol for Alveolar Macrophages

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Total RNA from in vitro cultured AMs was extracted using RNeasy Plus Mini Kit (Qiagen) following the manufacture’s protocol. Two pools per genotype were used for RNA-seq. After quality control, high quality (Agilent Bioanalyzer RIN >7.0) total RNA was used to generate the RNA sequencing library. cDNA synthesis, end-repair, A-base addition, and ligation of the Illumina indexed adapters were performed according to the TruSeq RNA Sample Prep Kit v2 (Illumina, San Diego, CA). The concentration and size distribution of the completed libraries was determined using an Agilent Bioanalyzer DNA 1000 chip (Santa Clara, CA) and Qubit fluorometry (Invitrogen, Carlsbad, CA). Paired-end libraries were sequenced on an Illumina HiSeq 4000 following Illumina’s standard protocol using the Illumina cBot and HiSeq 3000/4000 PE Cluster Kit. Base-calling was performed using Illumina’s RTA software (version 2.5.2). Paired-end RNA-seq reads were aligned to the mouse reference genome (GRCm38/mm10) using Bowtie (v2.3.4). Pre- and post-alignment quality controls, gene level raw read count and normalized read count (i.e. FPKM) were performed using RSeQC package (v2.3.6) with NCBI mouse RefSeq gene model. Differential expression for each gene between various groups specified in the text was identified by Cuffdiff (Trapnell et al., 2010 (link)).
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6

RNA-seq Analysis of CD8+ T Cells

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RNA from Sorted CD8+ T cells was extracted using an RNeasy kit (Qiagen) following the manufacturer’s instructions. After quality control, High quality total RNA was used to generate the RNA sequencing library. cDNA synthesis, end-repair, A-base addition, and ligation of the Illumina indexed adapters were performed according to the TruSeq RNA Sample Prep Kit v2 (Illumina, San Diego, CA). The concentration and size distribution of the completed libraries was determined using an Agilent Bioanalyzer DNA 1000 chip (Santa Clara, CA) and Qubit fluorometry (Invitrogen, Carlsbad, CA). Paired-end libraries were sequenced on an Illumina HiSeq 4000 following Illumina’s standard protocol using the Illumina cBot and HiSeq 3000/4000 PE Cluster Kit. Base-calling was performed using Illumina’s RTA software (version 2.5.2). Paired-end RNA-seq reads were aligned to the mouse reference genome (GRCm38/mm10) using RNA-seq spliced read mapper Tophat2 (v2.1.1). Pre- and post-alignment quality controls, gene level raw read count and ormalized read count (i.e. FPKM) were performed using RSeQC package (v2.3.6) with NCBI mouse RefSeq gene model. RNA-seq data were deposited in GEO database (GEO: GSE135278).
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