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Sample GSM5494923 Query DataSets for GSM5494923
Status Public on Oct 18, 2023
Title K562_library1_1_gRNA amplification
Sample type SRA
Source name K562 cell line
Organism synthetic construct
Characteristics treatment: tranduced with a CRISPR KO library 1(molncRNA(-)+IC gRNA)
cell line: K562
Treatment protocol gRNAs were connected to the tandem double gRNA expression plasmid (pLV-hEF1a-EGFP-2A-Puro-U6-gRNA1-7sK-gRNA2) to obtain the gRNA libraries expressing EGFP green fluorescence. 3×106 of K562 cells in 7.5 ml media plus 8 µg/ml polybrene were transduced, with either of the gRNA-EGFP (MOI ~4) or Cas9-mCherry (MOI ~50) expressing viruses that had been packaged singly. At 72 hours post-infection, gRNA-EGFP+/Cas9-mCherry+ cells were collected by flow-cytometry and subjected to Single-cell RNA-seq.
Growth protocol (Sample 8-14) Human erythroleukemia cell line K562 was maintained in RPMI1640 supplemented with 10% FBS (Gibco, Carlsbad, CA, USA).
Extracted molecule total RNA
Extraction protocol The enriched PCR procedure was performed as described previously(Hill et al., 2018) with the following modifications. A heminested PCR starting from 40 ng of full-length cDNA was used to enrich for gRNA barcodes. Q5 High-Fidelity DNA Polymerase (New England BioLabs) was used for PCR amplification according to the following PCR protocol: (1) 98°C for 45 s, (2) 98°C for 15 s, 65°C for 20 s, then 72°C for 60 s (14-16 cycles). PCRs were cleaned with Zymo DNA Clean & Concentrator-5 columns (Zymo, Orange County, CA, USA) and 15 µl of a 1:2 dilution of the first PCR and 1:2 dilution of the second PCR were carried in each reaction. Then fragments of length 400-500 bp were selected using 8% TBE gel.
Library strategy OTHER
Library source transcriptomic
Library selection other
Instrument model HiSeq X Ten
Description gRNA amplification library for 10X cDNA samples (K562_library1_1)
Sample 8
Data processing Library strategy: amplified gRNA sequencing
All 10x scRNA-seq datasets were processed with the Cell Ranger (v3.0.2) pipeline ( and were mapped to the Homo sapiens genome (Ensembl GRCh38.p12). This step yields a total of 71,014 cells, and an average of 52,758 reads per cell; 3,326 median genes per cell, and a median of 17,478 UMIs per cells.
Libraries of gRNA amplification were separately indexed and sequenced as spike-ins alongside the scRNA-seq libraries. UMI and cell-barcode assignments were made for each read by processing these samples with the Cell Ranger (v3.0.2) 'count' tools. Then, we combined the output bam files and the whitelist of guides sequence in our libraries to obtain the cell-barcode and guide pairwise using '' (Hill et al., 2018) with parameters: "--search_seq TTGTGGAAAGGACGAAACACCG --all_reads --barcode_length 20 --no_swalign --chimeric_threshold 0.2". The similar chimeric sequences and reads unassigned to a gRNA were removed. Cell barcodes detected in the gRNA amplification libraries were then matched with cell-barcodes detected in the regular 10x scRNA-seq libraries. We take all whitelist sequences that have at least one UMI counts and account for over 7.5% of the whitelist reads assigned to a given cell using 'preprocess_cfg.R' tools (Hill et al., 2018).
Genome_build: Ensembl GRCh38.p12
Supplementary_files_format_and_content: Barcodes detected, genes detected and matrix h5 files are provided for each sample
Supplementary_files_format_and_content: *whitelist.txt: gRNA sequence list
Submission date Aug 02, 2021
Last update date Oct 18, 2023
Contact name Yue Huo
Organization name Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College
Department State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences
Lab Key Laboratory of RNA and Hematopoietic Regulation
Street address Dongcheng District, Dongdan 3 Tiao 5 Hao
City Beijing
State/province Beijing
ZIP/Postal code 100005
Country China
Platform ID GPL26697
Series (1)
GSE181338 Dissecting long non-coding RNAs derived from microRNA genes in hematopoiesis (scRNA sequencing)
BioSample SAMN20522709
SRA SRX11631443

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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