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HP1BP3, a chromatin retention factor for co-transcriptional microRNA processing

ABSTRACT: HP1BP3, a chromatin retention factor for co-transcriptional microRNA processing

PROVIDER: PRJNA311740 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR3162890.fastq.gz	Fastqsanger.gz
	SRR3162891.fastq.gz	Fastqsanger.gz
	SRR3162892.fastq.gz	Fastqsanger.gz
	SRR3162883.fastq.gz	Fastqsanger.gz
	SRR3162893.fastq.gz	Fastqsanger.gz

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Project description:Identification and characterization of HP1BP3 (a human histone H1 homologue) as a novel chromatin retention factor essential for the co-transcriptional processing of pri-miRNA. We generated BAC transgenic cells at 80% confluency (~1x107) were cross-linked with 1% formaldehyde for 10 minutes at 37Â°C, and quenched with 125 mM glycine at room temperature for 5 minutes. The fixed cells were washed twice with cold PBS, scraped, and transferred into 1 ml PBS containing protease inhibitors (Roche). After centrifugation at 700 g for 4 minutes at 4Â°C, the cell pellets were resuspended in 100 Î¼l ChIP lysis buffer (1% SDS, 10 mM EDTA, 50 mM Tris-HCl [pH 8.1] with protease inhibitors) and sonicated at 4Â°C with a Bioruptor (Diagenode) (30 seconds ON and 30 seconds OFF at highest power for 15 minutes). The sheared chromatin with a fragment length of ~200 â 600 bp) was centrifuged at 20,000 g for 15 minutes at 4Â°C). 100 Î¼l of the supernatant was used for ChIP or as input. A 1:10 dilution of the solubilized chromatin in ChIP dilution buffer (0.01% SDS, 1.1% Triton X-100, 1.2 mM EDTA, 167 mM NaCl 16.7 mM Tris-HCl [pH 8.1]) was incubated at 4Â°C overnight with 6 Î¼g/ml of a goat anti-GFP (raised against His-tagged full-length eGFP and affinity-purified with GST-tagged full-length eGFP). Immunoprecipitation was carried out by incubating with 40 Î¼l pre-cleared Protein G Sepharose beads (Amersham Bioscience) for 1 hour at 4Â°C, followed by five washes for 10 minutes with 1ml of the following buffers: Buffer I: 0.1% SDS, 1% Triton X-100, 2 mM EDTA, 20 mM Tris-HCl [pH 8.1], 150 mM NaCl; Buffer II: 0.1% SDS, 1% Triton X-100, 2 mM EDTA, 20 mM Tris-HCl [pH 8.1], 500 mM NaCl; Buffer III: 0.25 M LiCl, 1% NP-40, 1% deoxycholate, 1 mM EDTA, 10 mM Tris-HCl [pH 8.1]; twice with TE buffer [pH 8.0]. Elution from the beads was performed twice with 100 Î¼l ChIP elution buffer (1% SDS, 0.1 M NaHCO3) at room temperature (RT) for 15 minutes. Protein-DNA complexes were de-crosslinked by heating at 65Â°C in 192 mM NaCl for 16 hours. DNA fragments were purified using QiaQuick PCR Purification kit (QIAGEN) and eluted into 30 Î¼l H2O according to the manufacturerâs protocol after treatment with RNase A and Proteinase K.

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HP1BP3, a chromatin retention factor for co-transcriptional microRNA processing

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