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Sample GSM3878567 Query DataSets for GSM3878567
Status Public on Jun 04, 2020
Title GeCKO-Dnmt3L_SORT_T1
Sample type SRA
Source name CRISPR-library-introduced Dnmt3L-GFP/iRFP KI mESC line derived from C57BL6/J mESC
Organism Mus musculus
Characteristics cell type: Embryonic stem cell
treatment: Sorted_technical_rep1
Treatment protocol Nanog, Trim28, Dnmt3L knockin cells were transduced with the Mouse CRISPR Knockout Pooled Library (GeCKO v2) (Addgene, # 1000000052) (Sanjana et al., 2014) via spinfection as previously described. We used only Mouse library A gRNA. Briefly, 3x10^6 cells per well (a total of 1.2 x 10^7 cells) were plated into a LN511-coated 12 well plate in the standard media supplemented with 8 µg/ml polybrene (Sigma-Aldrich). Each well received a virus amount equal to MOI = 0.3. The 12-well plate was centrifuged at 1,000 g for 2 h at 37°C. After the spin, media was aspirated and fresh media (without polybrene) was added. Cells were incubated overnight. 24 h after spinfection, cells were detached with trypsin and were replated into 4 of LN511-coated 10 cm dishes with 0.5 µg/mL puromycin for 3 days. Media was refreshed daily. At 6 days after transduction, cells were treated with 25 µM BV. After 24 h, at least 1.75 × 10^5 cells showing GFP/iRFP expression ratio close to 1 were sorted by FACS, and plated on 12 well plates (LM 511/Std condition). Unsorted cells were passaged to 10 cm plates, 5 × 10^5 each. After expansion of these sorted cells for 1 week, cells with GFP/iRFP expression ratio were close to 1 were sorted again. These sorting and expansion procedures were repeated 4 times in total.
Growth protocol We knocked in GFP and iRFP reporter separately into the two alleles for Nanog, Trim28 and Dnmt3L genes using WT mESC line (Bruce 4 C57BL/6J, male, EMD Millipore, Billerica, MA). Knockin mESC lines were cultured on Laminin-511 coated dish under Std medium (StemSure D-MEM [Wako Pure Chemicals, Osaka, Japan], 15% of fetal bovine serum, 0.1 mM β-mercaptoethanol, 1x MEM nonessential amino acids [Wako Pure Chemicals], a 2 mM L-alanyl-L-glutamine solution [Wako Pure Chemicals], 1000 U/mL LIF [Wako Pure Chemicals], 20 mg/ mL gentamicin [Wako Pure Chemicals]).
Extracted molecule genomic DNA
Extraction protocol After 3 days after the fourth sorting, 2 x 10^5 cells were collected and genomic DNA was extracted using Wizard Genomic DNA Purification kit (Promega).
PCR of the virally integrated guides was performed on sgDNA at the equivalent of approximately 2000 cells per guide in 48 parallel reactions using KOD-FX neo (TOYOBO, Japan) in a single-step reaction of 22 cycles. Primers are listed here: forward primer, AATGATACGGCGACCACCGAGATCTACACTCTTTC CCTACACGACGCTCTTCCGATCTNNNNNNNN(1–8-bp stagger) GTGGAAAGGACGAAACACCG; reverse primer, CAAGCAGAAGACGGCATACGAGATNNNNNNNN GTGACTGGAGTTCAGACGTGTGCTCTTCCGATCTTGTGGGCGATGTGCGCTCTG, 8-bp index read barcode indicated in italic. PCR products from all 48 reactions were pooled, purified using PCR purification kit (Qiagen, Hilden, Germany) and gel extracted using the Gel extraction kit (Qiagen, Hilden, Germany).
Resulting libraries were deep-sequenced on Illumina HiSeq platform with a total coverage of >8 million reads passing filter per library.
Library strategy OTHER
Library source genomic
Library selection other
Instrument model Illumina HiSeq 2500
Data processing Cutadapt software (Martin, 2011) was used to trim adapter with the parameters “-g CGAAACACCG.”
MAGeCK (v0.5.5) (Li et al., 2014) count command was executed with the parameters “count -l FASTA_GeckoV2_Mouse_A.csv --trim-5 0 --norm-method total --control-sgrna FASTA_GeckoV2_Mouse_A_controlList.txt.”
Genome_build: FASTA_GeckoV2_Mouse_A.csv
Supplementary_files_format_and_content: FASTA_GeckoV2_Mouse_A.csv is a reference file used for alignment.; FASTA_GeckoV2_Mouse_A_controlList.txt containing a list of control sgRNAs is used in MAGeCK analysis.; gecko_low.count.txt is resulting count data.
Submission date Jun 12, 2019
Last update date Jun 04, 2020
Contact name Itoshi NIKAIDO
Organization name RIKEN
Department Center for Biosystems Dynamics Research
Lab Laboratory for Bioinformatics Research
Street address 2-1 Hirosawa
City Wako
State/province Saitama
ZIP/Postal code 351-0198
Country Japan
Platform ID GPL17021
Series (2)
GSE132590 Genome-wide CRISPR library screening to identify genes involved in the regulation of the kinetic properties of transcriptional bursting
GSE132593 Genome-wide kinetic properties of transcriptional bursting in mouse embryonic stem cells
BioSample SAMN12037597
SRA SRX6047921

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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