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17 protocols using chromium single cell 3 kit

1

Single-cell RNA-seq from mouse brain

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Single-nuclei separation, barcoding, and cDNA generation were performed following the manufacturer’s instruction using the Chromium single cell 3′ kit (V3, 10X Genomics PN-1000073). cDNA concentration and quality were measured using Qubit Fluorimeter (Thermo Fisher) and Tape Station (Agilent), respectively, and was stored at –20°C until library preparation.
Libraries were generated from all samples at the same time (eight total samples, 2 WT/2 KO Vglut2 cKO model; 2 WT/2KO IP3R2 KO model) following the manufacturer’s instructions using the Chromium single cell 3′ kit (V3, 10X Genomics PN-1000075). Library quality was assessed with a Tape Station (Agilent). NovaSeq sequencing was performed at the UCSF Center for Advanced Technology, at ~300 million reads/sample (60,000 reads/cell).
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2

Single-cell RNA-seq of Isolated B Cells

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B cells were isolated from frozen-thawed PBMCs using the EasySep Human B cell Isolation Kit (STEMCELL Technologies) on a RoboSep platform. Cells were encapsulated in droplets using the Chromium Controller (10x Genomics). Reverse transcription and cDNA amplification were performed using the Chromium Single Cell 3′ Kit (10x Genomics). All steps were done according to the manufacturer’s instructions. One hundred nanograms of cDNA (25% of generated cDNA) was used as input for library preparation. Libraries were sequenced using the Illumina HiSeq 3000 platform eight lanes of sequencing at 26 bp–8 bp–98 bp according to 10x Genomics sequencing recommendations.
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3

Single-Cell RNA-Seq Library Preparation

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The suspensions of single cells were loaded onto Chromium microfluidic chips to generate single‐cell gel bead emulsions using the Chromium Controller from 10X Genomics, following the manufacturer's instructions. The mRNA from the samples was processed with the Chromium Single‐Cell 3′ kit from 10X Genomics, and full‐length, barcoded cDNA was generated by PCR amplification to produce enough material for library construction. The library were assessed using an Agilent Bioanalyzer 2100, and sequencing was carried out on an Illumina NovaSeq 6000 (LC‐Bio Technology Co.Ltd., Hangzhou, China) using paired‐end multiplexing with a read length of 150 bp.71, 72
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4

Single-cell RNA-seq Library Preparation

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The same method was used to make the single-cell suspension as described above. We first collected GFP- and Hoechst-positive single cells in a 1.5-ml Eppendorf tube with 0.3 ml of collection buffer [phosphate-buffered saline (PBS) + 0.04% bovine serum albumin]. The cells were spun down on a centrifuge by 700g for 10 min. We used the Chromium Single Cell 3′ Kit (v3) of 10X Genomics. The libraries were prepared according to the standard user guide (CG000315 Rev. B) from 10X without any modifications.
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5

Evaluating Nuclei Suspension Quality for scRNA-Seq

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Timing: 30 min

Here we describe how we evaluate the quality of the nuclei suspension and calculate the nuclei concentration. In terms of quality control, we consider this protocol successful if 1) nuclei appear as a single-nuclei solution and are not clumped together, and 2) nuclei look intact. For these quality control steps the following staining approaches were used.

Assess nuclei integrity with Ethidium Homodimer-1 (EthD-1) staining.

Stain 10 μL of nuclei suspension (from 11e) with 4 μM EthD-1 (Figure 1B). EthD-1 emits red fluorescence upon binding to DNA and will show DNA blebbing if the sample quality is low. Visualize stained nuclei under an epifluorescence microscope in the red channel.

Count nuclei with Trypan Blue staining

Stain 10 μL of nuclei suspension (from Step 11e) with 10 μL of premade 0.4% Trypan Blue.

Load the stained sample on a hemocytometer and visualize the nuclei under a bright field microscope. Count blue/purple stained nuclei.

Adjust the final concentration of nuclei to 1000 nuclei/μL with NSB.

Continue with preparation of droplet-based single-nuclei RNA-seq libraries using the Chromium Single Cell 3′ kit (10× Genomics) according to the manufacturer’s protocol

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6

Single-cell RNA-sequencing of cells

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We used the Chromium Single Cell 3′ kit (v3) of 10x Genomics for performing scRNA-sequencing. The single cell suspension prepared above was loaded onto a Chromium Single-Cell instrument (10x Genomics) to generate single-cell barcoded droplets (GEMs) as detailed in manufacture’s protocol. The resulting libraries were pooled and sequenced across two lanes on an Illumina HiSeq2500 instrument in High-output mode by Novogene. Reads were aligned and subsequent analyses performed using the Cell Ranger (Pipeline). We obtained 68k reads per cell with a median genes per cell of 1,017 and median UMI count per cell of 2,040. The accession number for the scRNA-seq data is GEO database: GSE172059.
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7

Single-cell RNA-sequencing of cells

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We used the Chromium Single Cell 3′ kit (v3) of 10x Genomics for performing scRNA-sequencing. The single cell suspension prepared above was loaded onto a Chromium Single-Cell instrument (10x Genomics) to generate single-cell barcoded droplets (GEMs) as detailed in manufacture’s protocol. The resulting libraries were pooled and sequenced across two lanes on an Illumina HiSeq2500 instrument in High-output mode by Novogene. Reads were aligned and subsequent analyses performed using the Cell Ranger (Pipeline). We obtained 68k reads per cell with a median genes per cell of 1,017 and median UMI count per cell of 2,040. The accession number for the scRNA-seq data is GEO database: GSE172059.
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8

Chromium Single Cell 3' Kit (v3.1) for SARGENT

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We used the Chromium Single Cell 3’ Kit (v3.1) from 10× Genomics for SARGENT. We followed the manufacturer’s instructions for preparing single-cell suspensions. We used a cell counter to measure the number of cells and viability and used cell preparations with greater than 95% cell viability.
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9

Single-cell RNA-seq of Mouse Samples

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Female samples were processed at the Scripps Genomics core (La Jolla, CA, USA). Male samples were prepared on a different day by the Next Generation Sequencing (NGS) Core at the Salk institute (La Jolla, CA, USA) in similar conditions. For each sample (n = 3 mice), 15,000 cells were processed for scRNAseq using the Chromium Single Cell 3′ kit (v3.1 Chemistry) from 10× Genomics (Pleasanton, CA, USA) according to the manufacturer’s protocols. The cDNA was amplified by 11 cycles. Analysis of the cDNA and libraries was conducted using Bioanalyzer or TapeStation (Agilent, Santa Clara, CA, USA). The libraries were sequenced multiple times by Nextseq 550 systems and Novaseq 6000 sequencer (Illumina, San Diego, CA, USA) to reach the targeted minimal sequencing depth (20,000 reads/cell).
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10

Single-Cell RNA-Seq of PDOs

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Irradiated (5 Gy/day over 5 days) and non-irradiated PDOs were dissociated into single cells after a 6-day recovery period. Libraries were prepared aiming for 7000 cell recovery, using 11 cycles of amplification of cDNA and 12 cycles for indexing PCR using the Chromium single cell 3’ kit (10X Genomics, USA). Sequencing was performed using a NextSeq™ 550 HIGH 150 flow cell and NGS platform.
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