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Sample GSM1852842 Query DataSets for GSM1852842
Status Public on Apr 05, 2016
Title Cy59_95
Sample type SRA
Source name melanoma tumor
Organism Homo sapiens
Characteristics tumor-of-origin: Cy59
Treatment protocol Resected tumors were transported in DMEM (ThermoFisher Scientific) on ice immediately after surgical procurement. Tumors were rinsed with PBS (Life Technologies). A small fragment was stored in RNA-protect (Qiagen) for bulk RNA and DNA isolation. Using scalpels, the remainder of the tumor was minced into tiny cubes <1 mm3 and transferred into a 50 ml conical tube (BD Falcon) containing 10 ml pre-warmed M199-media (ThermoFisher Scientific), 2 mg/ml collagenase P (Roche) and 10U/μl DNase I (Roche). Tumor pieces were digested in this digestion media for 10 minutes at 37°C, then vortexed for 10 seconds and pipetted up and down for 1 minute using pipettes of descending sizes (25 ml, 10 ml and 5 ml). If needed, this was repeated twice more until a single-cell suspension was obtained. This suspension was then filtered using a 70μm mesh (ThermoFisher Scientific) and residual cell clumps were discarded. The suspension was supplemented with 30 ml PBS (Life Technologies) with 2% fetal calf serum (FCS) (Gemini Bioproducts) and immediately placed on ice. After centrifuging at 580g at 4°C for 6 minutes, the supernatant was discarded and the cell pellet was re-suspended in PBS with FCS and placed on ice prior to staining for FACS. Single-cell suspensions were stained with CD45-FITC (VWR), Calcein-AM (Life Technologies) and CD90-PE (BioLegend) per manufacturer recommendations. First, doublets were excluded based on forward and sideward scatter, then we gated on viable cells (Calceinhigh) and sorted single cells (CD45+ or CD45-CD90+ or CD45-CD90-) into 96-well plates chilled to 4°C, pre-prepared with 10μl TCL buffer (Qiagen) supplemented with 1% beta-mercaptoethanol (lysis buffer). Single-cell lysates were vortexed, spun down at 3700 rpm at 4°C for 2 minutes, immediately placed on dry ice and transferred for storage at -80°C.
Growth protocol no culturing (freshly-resected tumor samples)
Extracted molecule polyA RNA
Extraction protocol RNA and DNA were isolated using the Qiagen minikit following the manufacturers recommendations. Whole Transcriptome amplification (WTA) was performed with a modified SMART-Seq2 protocol, with Maxima Reverse Transcriptase (Life Technologies) used in place of superscript II.
WTA products were cleaned with Agencourt XP DNA beads and 70% ethanol (Beckman Coulter) and Illumina sequencing libraries were prepared using Nextera XT (Illumina), as previously described (15). The 96 samples of a multiwall plate were pooled together, and cleaned with two 0.8x DNA SPRIs (Beckman Coulter). Library quality was assessed with a high sensitivity DNA chip (Agilent) and quantified with a high sensitivity dsDNA Quant Kit (Life Technologies). Samples were sequenced on an Illumina NextSeq 500 instrument using 30bp paired-end reads.
Library strategy RNA-Seq
Library source transcriptomic
Library selection cDNA
Instrument model Illumina NextSeq 500
Description single cell RNA-seq
Data processing Following sequencing on the NextSeq, BAM files were converted to merged, demultiplexed FASTQs. Paired-end reads were then mapped to the UCSC hg19 human transcriptome using Bowtie with parameters "-q --phred33-quals -n 1 -e 99999999 -l 25 -I 1 -X 2000 -a -m 15 -S -p 6", which allows alignment of sequences with single base changes such as due to point mutations. Expression levels of genes were quantified as Ei,j=log2(TPMi,j/10+1), where TPMi,j refers to transcript-per-million (TPM) for gene i in sample j, as calculated by RSEM v1.2.3 in paired-end mode. TPM values were divided by 10 since we estimate the complexity of our single cell libraries to be on the order of 100,000 transcripts and would like to avoid counting each transcript ~10 times, as would be the case with TPM, which may inflate the difference between the expression level of a gene in cells in which the gene is detected and those in which it is not detected. For each cell, we quantified the number of genes for which at least one read was mapped, and the average expression level of a curated list of housekeeping genes. We then excluded all cells with either fewer than 1,700 detected genes or an average housekeeping expression (E, as defined above) below 3. Only genes detected with E>2 in at least 5 cells were retained in the processed data file.
Genome_build: hg19
Supplementary_files_format_and_content: Tab-delimited text file containing the normalized expression levels (E) for all genes with E>2 in at least 5 cells, across 3,249 cells that passed QC. the tumor-of-origin is indicated in the name of each cell (CY##). The first row denotes the classification (based on inferred CNVs) to malignant (2), non-malignant (1) or unresolved (0) cells. The second row denotes the inferred cell types for non-malignant cells, including T-cells (1), B-cells (2), Macrophages (3), Endothelial cells (4) and CAFs (5). All other rows correspond to genes.
Submission date Aug 13, 2015
Last update date Nov 07, 2019
Contact name Itay Tirosh
Street address Herzl 234
City Rehovot
State/province NA
ZIP/Postal code 7610001
Country Israel
Platform ID GPL18573
Series (1)
GSE72056 Single cell RNA-seq analysis of melanoma
BioSample SAMN03990538
SRA SRX1148409

Supplementary data files not provided
SRA Run SelectorHelp
Processed data are available on Series record
Raw data provided as supplementary file

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