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Sample GSM4027860 Query DataSets for GSM4027860
Status Public on Aug 13, 2019
Title BCR2__S0159_S159
Sample type SRA
Source name IGHV1-69_VL_Post Boost 1_Splenic B cells
Organism Mus musculus
Characteristics genotype: IGHV1-69
antibody chain: VL
experiment: Post Boost 1
cell type: Splenic B cells
molecule subtype: BCR Amplicon from RNA
Extracted molecule total RNA
Extraction protocol Mouse spleens were removed and single cell suspensions were obtained using 70 um cell strainer. Cells were stained using Aqua Live/Dead dye, followed by a cocktail of the following antibodies with the relevant probes: CD4 Alexa Fluor 700 (Cat# 557956, BD Biosciences); and CD3e PE-Cy7 (100320, Biolegend), CD19 BV421 (Cat# 115549, BioLegend), IgM BV605 (Cat# 406523, BioLegend), IgG PerCPCy5.5 (Cat#405314, Biolegend). Naïve B cells (CD3-/CD19+/IgG-/IgM+) were bulk sorted into RLT/1% beta-mercaptoethanol (BME). SS-np induced single B cells, including post boost 1, post boost 2 and post boost 3 (CD3-/CD19+/IgG+/IgM-/H1+ probe/H5+ probe), were sorted into 96 well plates containing RLT lysis buffer/1% BME. SS-np on-target single B cells were defined as CD3-/CD19+/IgM+/IgG-/SS-np Alexa 488+ probe/SS-np Alexa 594+ probe/SS-npDstem Alexa 647- probe/SS-npDstem Alexa 546- probe. Adoptive transfer single B cells are defined as CD3-/CD4-/B220+/GL7+/CD45.1-/CD45.2+/G6+.
RNA seq BCR libraries from single cells were generated by whole transcriptome amplification (WTA) using the Smart-Seq2 protocol (Trombetta et al., 2014). Single cell BCR amplicons for heavy and light chains (FR1 to CDR3) were generated separately using a pool of partially degenerate V region gene primers against all possible IGHV (human) or IGLV (mouse) and IGKV (mouse) segments in the FR1 region and reverse primers against the heavy or light constant regions containing the Illumina P7 and P5 sequences. Barcodes and Illumina sequencing adaptors (based on Nextera XT Index Adapters, Illumina Inc.) were then added to each amplified heavy and light chain using a step-out PCR. Single-cell BCR libraries were sequenced using paired end 250x250 reads and 8x8 index reads on an Illumina MiSeq System (MiSeq Reagent Kit v2 500-cycle; Illumina, San Diego, US). Bulk BCR amplicons were generated following the same WTA step and two subsequent PCR steps as above, except that in the first PCR, the cocktail of V gene primers was replaced with a forward primer specific for the FR3 region within the VH gene of interest (IGHV1-69 or IGHV1-2). The resulting product (FR3 to CDRH3) was sequenced on Illumina MiSeq as above except without index reads.
Library strategy RNA-Seq
Library source transcriptomic
Library selection cDNA
Instrument model Illumina MiSeq
Description processed data file: Consensus_Alignments.txt
Data processing For single cells, paired end reads were merged into full length heavy and light chain reads using PANDAseq (v2.7).
Full length reads were aligned/constructed from human heavy and light chains using MigMAP (v.1.0.2).
Consensus heavy and light chains for each single cell were then determined by collapsing all reads by CDR3 sequence and calling the top hit for heavy and light, respectively. Any sequence without at least 25 reads or frequency 2x greater than the next sequence of the same chain was denoted without consensus.
For bulk heavy chain analysis, reads were aligned to human using mixcr (v.2.1.8) with the following parameter for alignment: OvParameters.geneFeatureToAlign = {FR3Begin:Vend}.
Downstream bulk analysis was preformed in R (v.3.4.3) using the tcR package (v2.2.3) and custom scripts. 
Genome_build: IMGT (compiled Dec. 2017)
Supplementary_files_format_and_content: tab delimited txt file
Submission date Aug 12, 2019
Last update date Aug 14, 2019
Contact name Maya Sangesland
Organization name Ragon Institute of MGH, MIT, and Harvard
Lab Lingwood Lab
Street address 400 Technology Square
City Cambridge
State/province MA
ZIP/Postal code 02139
Country USA
Platform ID GPL16417
Series (1)
GSE135761 Germline-Encoded Affinity for Cognate Antigen Enables Vaccine Amplification of a Human Broadly Neutralizing Response Against Influenza Virus
BioSample SAMN12563490
SRA SRX6704897

Supplementary data files not provided
SRA Run SelectorHelp
Raw data are available in SRA
Processed data are available on Series record

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