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SRX20209943: GSM7291134: WT_ovaries_1_8st_RNASeq_rep1; Drosophila melanogaster; RNA-Seq
1 ILLUMINA (Illumina NovaSeq 6000) run: 32.2M spots, 3.2G bases, 1Gb downloads

External Id: GSM7291134_r1
Submitted by: Institute of Gene Biology RAS
Study: Su(Hw) interacts with Combgap to establish long-range chromatin contacts
show Abstracthide Abstract
Insulator-binding proteins (IBPs) play a critical role in genome architecture by forming and maintaining contact domains. While the involvement of several IBPs in organising chromatin architecture in Drosophila has been described, the specific contribution of the Suppressor of Hairy wings (Su(Hw)) IBP to genome topology remains unclear. In this study, we provide evidence for the existence of long-range interactions (LRIs) between Su(Hw) and Combgap ChIP-Seq peaks, reflected in the indirect binding of these proteins to chromatin in ChIP experiments. Loss of Su(Hw) binding results in the disappearance of Su(Hw)-Combgap LRIs and a decrease in spatial self-interactions among a subset of Su(Hw) sites. Our findings suggest that Su(Hw)-Combgap LRIs are associated with active chromatin rather than Polycomb-directed repression. Furthermore, we observe that the majority of transcription start sites that are down-regulated upon loss of Su(Hw) binding to chromatin are located within 2 kb of Combgap peaks and exhibit Su(Hw)-dependent changes in Combgap and transcriptional regulators' binding. Overall design: All flies were raised at 25°C on standard agar medium. Ovaries were dissected from recently eclosed 15 hour-old flies (contain only egg chamber stages 1-8).
Sample: WT_ovaries_1_8st_RNASeq_rep1
SAMN34569543 • SRS17534048 • All experiments • All runs
Library:
Name: GSM7291134
Instrument: Illumina NovaSeq 6000
Strategy: RNA-Seq
Source: TRANSCRIPTOMIC
Selection: cDNA
Layout: SINGLE
Construction protocol: For the ChIP-Seq experiments ovaries were collected in PBS buffer (50 pairs per ChIP), cross-linked with 1% of formaldehyde for 5 min and then incubated for 5 min with 125 mM Glycine. After that ovaries were washed with PBS buffer for three times. The remaining ChIP protocol was performed as described previously (Vorobyeva et al (2013) NAR, 41:11, 5717–5730). For the in situ Hi-C experiments, ovaries were collected in PBS buffer (200 pairs per Hi-C), cross-linked with 1% of formaldehyde for 5 min and then incubated for 5 min with 125 mM Glycine. Then ovaries were washed with 1xPBS buffer for three times. The remaining in situ Hi-C protocol was performed as described previously (Rao et al (2014) Cell, 159:1665-1680). For extraction of RNA the ovaries of 15 hour old wild-type (oregon) and su(Hw)v/E8 females were collected in PBS buffer (50 pairs per sample), in two biological repeats. Total RNA was extracted with the TRI reagent (Ambion). PolyA comprising RNA fraction was isolated and prepared for sequencing with the NEBNext UltraTM II Directional RNA Library Prep Kit. ChIP-Seq, Hi-C and RNA-Seq libraries were prepared for sequencing using standard Illumina protocols
Runs: 1 run, 32.2M spots, 3.2G bases, 1Gb
Run# of Spots# of BasesSizePublished
SRR2442219032,213,6413.2G1Gb2024-05-24

ID:
27630074

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