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SRX23075086: GSM8000146: Prime editing of CREB3L3 after activation of NR2F1 in K562 (Rep1); Homo sapiens; OTHER
1 ILLUMINA (NextSeq 2000) run: 792,056 spots, 93.5M bases, 21.7Mb downloads

External Id: GSM8000146_r1
Submitted by: Jay Shendure, Department of Genome Sciences, University of Washington
Study: Chromatin context-dependent regulation and modulation of prime editing [amplicon]
show Abstracthide Abstract
Prime editing is a powerful means of introducing precise changes to specific locations in mammalian genomes. However, the widely varying efficiency of prime editing across target sites of interest has limited its adoption in the context of both basic research and clinical settings. Here, we set out to exhaustively characterize the impact of the cis-chromatin environment on prime editing efficiency. Utilizing a newly developed and highly sensitive method for mapping the genomic locations of a randomly integrated “sensor”, we identify specific epigenetic features that strongly correlate with the highly variable efficiency of prime editing across different genomic locations. Next, to assess the interaction of trans-acting factors with the cis-chromatin environment, we develop and apply a pooled genetic screening approach with which the impact of knocking down various DNA repair factors on prime editing efficiency can be stratified by cis-chromatin context. Finally, we demonstrate that we can dramatically modulate the efficiency of prime editing through epigenome editing, i.e. enhancing (or restricting) local chromatin accessibility in order to increase (or decrease) the efficiency of prime editing at a target site. Looking forward, we envision that the insights and tools described here will broaden the range of both basic research and therapeutic contexts in which prime editing is useful. Overall design: We randomly integrated a complex library of the synHEK3 reporters into a monoclonal K562 cell line constitutively expressing the PE2 prime editor. We further bottlenecked the pool to ~500 clones, each containing a unique combination of randomly inserted reporters, and performed T7-assisted reporter mapping on this population (T7-500-1). We further performed amplicon sequencing of synHEK3 reporters to measure the outcomes of prime editing (K562-HEK3-insCTT) as well as Cas9 editing (K562-HEK3-Cas9) in this pool of synHEK3 reporters. A few monoclonal lines were also derived from the 500-clone population. Files named "K562-SC1-5-OFF*" contain prime editing efficiencies measured in synHEK3 reporters in one of the monoclonal lines (Clone 5) in the settings of targeted gene silencing by CRISPRoffv2.1. "K562-HEK3-SC*" experiments measured the effects of various shRNAs on prime editing efficiencies in synHEK3 reporters in two monoclonal lines. Finally, the rest files are amplicon sequencing results of endogenous prime editing targets in the presense and absense of CRISPRa.
Sample: Prime editing of CREB3L3 after activation of NR2F1 in K562 (Rep1)
SAMN39224435 • SRS20034036 • All experiments • All runs
Organism: Homo sapiens
Library:
Name: GSM8000146
Instrument: NextSeq 2000
Strategy: OTHER
Source: GENOMIC
Selection: other
Layout: SINGLE
Construction protocol: K562 and WTC11 cells were lysed in a lysis buffer [100 mM Tris-HCl pH8.0, 0.05% SDS and 0.04 mg/mL proteinase K(Thermo Scientific)], and incubated at 50 oC 60 min and 80 oC 30 min. T7-assisted reporter mapping: gDNA of K562 cells was purified using the DNeasy Blood & Tissue Kit (QIAGEN) and in vitro transcribed with the HiScribe T7 High Yield RNA Synthesis Kit (New England Biolabs). Briefly, each reaction (20 uL) contained 0.3~1 ug gDNA, NTPs (10 mM each) and 2 ul T7 RNA Polymerase Mix. The reaction mixture was incubated at 37 oC for 16 hours. Then, gDNA was digested with 2.5 uL DNase (Qiagen) in a 100 uL reaction at room temperature for 30 min. RNA was extracted with TRIzol LS Reagent (Invitrogen), and aqueous phase was precipitated with 1 volume of isopropanol and 5 ug Glycogen (Invitrogen) at -80 oC for 1 hour. RNA pellet was collected by centrifugation at 21,000 x g at 4 oC for 1 hour. The pellet was washed with 80% ice-cold ethanol and resuspended in 11.5 uL nuclease-free water. For reverse transcription, RNA was incubated with 0.5 uL 100 uM RT primer p6 (5'-TCGTCGGCAGCGTCAGATGTGTATAAGAGACAGNNNNNNNN-3') and 1 uL 10 mM dNTP at 65 oC for 5 min and cooled on ice. Then, 4 uL 5X RT buffer, 1 uL 100 mM DTT, 1 uL RNaseOUT (40 U/uL) and 1 uL SuperScript IV RT (200 U/uL, Invitrogen) were added and the reaction mixture was incubated at 23 oC for 10 min, 50 oC for 15 min and 80 oC for 10 min. cDNA library was amplified with KAPA2G Robust HotStart polymerase, using primers p7 (5'- GTGACTGGAGTTCAGACGTGTGCTCTTCCGATCTGAAAGGAAGCCCTGCTTCCTCCAGAGGG-3', 0.5 uM) and p8 (5'- TCGTCGGCAGCGTCAGATGTGTATAAGAGACAG-3', 0.5 uM). PCR reaction was performed as follows: 95 oC 3 min; 95 oC 15 s, 65 oC 15 s, 72 oC 30 s, 16~18 cycles; and 72 oC 1 min. The PCR product was subjected to double-sided size selection (0.5X, 0.9X) and cleaned up with AMPure XP beads. The resulting product ranged from 200 to 1000 bp. To prepare Illumina sequencing libraries, 5-10 ng PCR product was re-amplified with the Nextera P5 and TruSeq P7 library index primers for 5 cycles. The final PCR product underwent another round of double-sided size selection (0.5X, 0.9X) and cleaned up with AMPure XP beads. The library was sequenced on an Illumina MiSeq in paired-end mode (Read 1: 254 bp; Read2: 55bp). Amplicon sequencing of synHEK3 reporters: 100~250 ng gDNA or cell lysates were amplified using KAPA2G Robust HotStart ReadyMix with primers p9 (5'-GTGACTGGAGTTCAGACGTGTGCTCTTCCGATCTCTACCCCGACCACATGAAGCAGC-3', 0.5 uM) and p10 (5'-TCGTCGGCAGCGTCAGATGTGTATAAGAGACAGNNNNNNNNNNGACCATGTCATCGCGCTTCTCGT-3', 0.5 uM). PCR reaction was performed as follows: 95 oC 3 min; 95 oC 15 s, 68-N oC 15 s, 72 oC 30 s, for 9 cycles (N was cycle number); 95 oC 15 s, 65 oC 15 s, 72 oC 30 s, for 11 cycles; and 72 oC 1 min. To ensure enough coverage and accurate measurement of editing efficiencies, for the K562 synHEK3 pool, we pooled products from at least 16 PCR reactions. The PCR product was purified with AMPure XP beads. 5 ng PCR product was re-amplified with the Nextera P5 and TruSeq P7 library index primers for 5 cycles. Other amplicon sequencing: Cell lysates or plasmids were directly used for PCR with the KAPA2G Robust HotStart ReadyMix with primers (0.5 uM each) designed for the endogenous targets. PCR reaction was performed as follows: 95 oC 3 min; 95 oC 15 s, 66-N oC 15 s, 72 oC 40 s, for 8 cycles (N was cycle number); 95 oC 15 s, 60 oC 15 s, 72 oC 40 s, for 11 cycles; and 72 oC 1 min. The PCR product was purified with AMPure XP beads. 5 ng PCR product was re-amplified with the Nextera P5 and TruSeq P7 library index primers for 5 cycles. Amplicon sequencing
Runs: 1 run, 792,056 spots, 93.5M bases, 21.7Mb
Run# of Spots# of BasesSizePublished
SRR27399089792,05693.5M21.7Mb2024-01-03

ID:
31168108

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