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SsDRIP-seq analysis of R-loop level in shCTRL, shMETTL3 and shDDX21 HeLa cells

ABSTRACT: ssDRIP-seq analysis of R-loop level in shCTRL, shMETTL3 and shDDX21 HeLa cells

PROVIDER: PRJNA553774 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR9667910_1.fastq.gz	Fastqsanger.gz
	SRR9667910_2.fastq.gz	Fastqsanger.gz
	SRR9667901_1.fastq.gz	Fastqsanger.gz
	SRR9667901_2.fastq.gz	Fastqsanger.gz
	SRR9667911_1.fastq.gz	Fastqsanger.gz

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ssDRIP-seq analysis of R-loop level in shCTRL, shMETTL3 and shDDX21 HeLa cells

Project description:gDNA was estracted and digested with cocktail of restrict enzymes MseI, DdeI, AluI, MboI, incubated at 37°C for 6 h. After purified by phenol/chloroform extraction, fragmented DNA was resuspended by TE, and quantified by Qubit 3.0 (Invitrogen). For each sample, 20 μg input DNA was immunoprecipitated overnight at 4°C in a shaker, with 1× DRIP binding buffer (10 mM NaPO4 pH 7.0, 140 mM NaCl, 0.05% Triton X-100) and 10 μg S9.6 antibody (ATCC, HB-8730). After adding 50 μl Dynabeads Protein G (Invitrogen, 10004D) and incubated for 4 h, the beads with antibody were washed by 1× DRIP binding buffer for 4 times at room temperature, each wash takes 10 min. Added 250 μl elution buffer (50 mM Tris pH 8.0, 10 mM EDTA, 0.5% SDS) and 5 U Proteinase K to beads/antibody complexes, incubated for 40 min in an Eppendorf ThermoMixer at 55°C, 1,000 rpm. Purified by phenol/chloroform extraction, and moved supernatant to a new tube, followed by adding 1/10 volume 3 M NaAc, 1 μl GlycoBlue (Invitrogen) and 1 volume isopropanol, precipitated at -20°C for 3 h and then centrifuged. After washed by 70% ethanol and dried, the DRIPed DNA pellet was resuspended by 75 μl low EDTA TE buffer (10 mM Tris-HCl 8.0, 0.1 mM EDTA). NGS libraries were constructed using Accel-NGS® 1S Plus DNA Library Kit (Swift Biosciences).

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Project description:Cells were washed with cold PBS twice and scraped from the plates, then centrifuged at 1000 rpm for 5 min to pellet cells. Washed cells were lysed with 400 L of cell lysis buffer (10 mM Tris-HCl pH7.5, 150 mM NaCl, 0.15% NP-40 and proteinase inhibitor cocktail) and incubated on ice for 10 min. The suspension was carefully add at the top of sucrose buffer (10 mM Tris-HCl pH7.5, 150 mM NaCl, 24% sucrose), and centrifuged at 3200g for 10 min to collect nuclear pellets. Pellets were resuspended in 250 L of Glycerol buffer (20 mM Tris-HCl pH7.5, 75 mM NaCl, 0.5 mM EDTA pH8.0, 50% glycerol), then then immediately add 250 μl Nuclear lysis buffer (10 mM Tris-HCl pH7.5, 300 mM NaCl, 7.5 mM MgCl2, 0.2 mM EDTA pH8.0, 1% NP-40, 1M urea). Mix by vortexing for 4 s and incubate on ice for 2 min. Centrifuge the lysate at 13,000 × g for 2 min to precipitate the chromatin–RNA complex. Brieﬂy rinse the chromatin pellets with PBS-EDTA. RNA was extracted with Trizol reagent. RNA libraries were prepared according to manual of SMARTer smRNA-Seq Kit for Illumina (Clontech, 635031).

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