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SRX22779235: GSM7946837: 3rG4 cl5 k27me3 rep2; Mus musculus; ChIP-Seq
1 ILLUMINA (Illumina NovaSeq 6000) run: 30.8M spots, 9.2G bases, 2.7Gb downloads

External Id: GSM7946837_r1
Submitted by: Jeannie Lee Lab, Mol bio, MASSACHUSETTS GENERAL HOSPITAL
Study: Epigenetic regulation by dynamic RNA G-quadruplex folding and unfolding (ChIP-Seq)
show Abstracthide Abstract
Whether RNA G-quadruplexes (rG4) form extensively in vivo and what roles they play remain actively debated. Among their proposed functions is recognition of Polycomb repressive complex 2 (PRC2), but how the interaction results in epigenetic regulation is not understood. Here we demonstrate that rG4s form dynamically during ES cell differentiation and require ATRX's helicase function to unwind competing secondary structures. Mutating ATRX causes rG4 depletion on a transcriptome-wide basis and dramatically increases gene expression. We identify and mutate rG4s within Xist RNA and mechanistically separate PRC2's recruitment versus catalysis. Surprisingly, although rG4s recruit PRC2, unfolding the rG4 structure causes PRC2 hyperactivation, entrapment of PRC2 in the S1 chromosomal compartment, and loss of gene silencing. Thus, we link dynamic rG4 folding and unfolding to PRC2 recruitment, trans-compartmental Xist migration, regulated activation of PRC2, and whole-chromosome gene silencing. Overall design: Modified existing rG4-seq and RT-Stop protocols were performed and generated an “in vitro” and “in vivo” pipeline, based on differential sensitivity of various RNA structures to dimethyl sulfate (DMS), reverse transcriptase (RT), and the monovalent cations Li+ versus K+.
Sample: 3rG4 cl5 k27me3 rep2
SAMN38675621 • SRS19763279 • All experiments • All runs
Organism: Mus musculus
Library:
Name: GSM7946837
Instrument: Illumina NovaSeq 6000
Strategy: ChIP-Seq
Source: GENOMIC
Selection: ChIP
Layout: PAIRED
Construction protocol: 10 million cells per ChIP were resuspended with 0.5 ml ice-cold ChIP lysis buffer (50 mM Tris-HCl pH8, 10 mM EDTA pH8, 1% SDS). Cell extracts were subjected to sonication using the Qsonica apparatus (40% power, 30s on/ 30s off for total sonication time 30 min at 4°C). Sheared chromatin was checked on the 1% agarose gel electrophoresis, repeat sonication a second time if the fragment is larger than 1 kb marker. 0.1 ml lysate was mixed with 1.2 ml ChIP dilution buffer (20 mM Tris-HCl pH8, 150 mM NaCl, 1% Triton X-100, 2 mM EDTA pH8), and incubated with 2 μg antibody for overnight at 4°C. Immunoprotein complex was captured with 20 μL Dynabeads Protein G for 5 hr incubation. Afterward, beads were washed three times with ChIP wash buffer 1 (20 mM Tris-HCl pH8, 150 mM NaCl, 2mM EDTA pH8, 1% Triton X-100, 0.1% SDS) and once with ChIP wash buffer 2 (20 mM Tris-HCl pH8, 500 mM NaCl, 2mM EDTA pH8, 1% Triton X-100, 0.1% SDS). 100 μL of ChIP elution buffer (1% SDS, 100 mM NaHCO3, 40 ug/ml RNaseA) was added to the washed bead and incubated for 1hr at 37°C to recover bound nucleoproteins, dynabeads were removed by using magnetic stand. Reverse-crosslinking was done by incubating the supernatant at 65° C overnight. NEBNext Ultra II DNA Kit (NEB) was used for library preparation by following the product manual.
Runs: 1 run, 30.8M spots, 9.2G bases, 2.7Gb
Run# of Spots# of BasesSizePublished
SRR2708996630,760,3799.2G2.7Gb2024-05-17

ID:
30816587

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