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SRX6780072: GSM4048302: ZAF1_repl2; Drosophila melanogaster; ChIP-Seq
1 ILLUMINA (Illumina HiSeq 2000) run: 10.8M spots, 477.1M bases, 270.1Mb downloads

Submitted by: NCBI (GEO)
Study: Genome-wide distribution of proteins ZAF1 and dCTCF in Drosophila embryos
show Abstracthide Abstract
Recently, the concept has arisen that a special class of architectural proteins exists, which are responsible not only for global chromosome architecture but also for the local regulation of enhancer–promoter interactions. Here, we describe a new architectural protein, with a total size of only 375 aa, which contains an N-terminal zinc finger-associated domain (ZAD) and a cluster of five C2H2 domains at the C-terminus. This new protein, named ZAD and Architectural Function 1 protein (ZAF1 protein), is weakly and ubiquitously expressed, with the highest expression levels observed in oocytes and embryos. The cluster of C2H2 domains recognizes a specific 15-bp consensus site, located predominantly in promotors, near transcription start sites. The expression of ZAF1 by a tissue-specific promoter led to the complete blocking of the eye enhancer when clusters of ZAF1 binding sites flanked the eye enhancer in transgenic lines, suggesting that the loop formed by the ZAF1 protein leads to insulation. The ZAF1 protein also supported long-range interactions between the yeast GAL4 activator and the white promoter in transgenic Drosophila lines. A mutant protein lacking the ZAD failed to block the eye enhancer or to support distance interactions in transgenic lines. Taken together, these results suggest that ZAF1 is a minimal architectural protein that can be used to create a convenient model for studying the mechanisms of distance interactions. Overall design: ChIP-seq signal of the ZAF1 (two replicates) and dCTCF (one replicate) architectural/insulator proteins occupancy in whole embryo during embryonic development at 0-12h after egg-laying.
Sample: ZAF1_repl2
SAMN12642279 • SRS5327002 • All experiments • All runs
Library:
Instrument: Illumina HiSeq 2000
Strategy: ChIP-Seq
Source: GENOMIC
Selection: ChIP
Layout: SINGLE
Construction protocol: Chromatin for input (0.5 ug of DNA) was brought to RIPA conditions (140mM NaCl / 10mM Tris-HCl pH8,0 / 1mM EDTA / 1% TritonX100 / 0,1% SDS / 0,1% sodium deoxycholate, 1mM PMSF) was diluted in TE with 0.5% SDS, treated with RNase A for 30 min and protease K overnight, incubated at 65 degrees for 6 hours and phenol chloroform extracted. Sepharose was resuspended in TE with 0.5% SDS, treated with RNase A for 30 min and protease K overnight, incubated at 65 degrees for 6 hours and phenol chloroform extracted. Libraries were prepared according to manufacturer's recommendations with small modifications. In short, 1-10ng of purified, RNase treated, and reverse cross-linked genomic DNA was end-repaired and terminal adenosine residues were added using the NEBNext reagents. Custom-made indexed adapters were ligated, after which the material was size selected at ~200-600 bp with Ampure XP beads (Beckman Coulter). PCR amplification was performed using PE1.0 and PE2.0 primers (custom-made) for 12 cycles for Input samples and 14 to 15 cycles for IP-ed samples using the Q5 Hot Start HiFi PCR Master Mix (NEB). The PCR-amplified library was purified using Ampure XP beads and its quality was assessed on a Bioanalyzer 2100 system (Agilent). The libraries were sequenced on a HiSeq 2000 (Illumina) in single end mode.
Experiment attributes:
GEO Accession: GSM4048302
Links:
Runs: 1 run, 10.8M spots, 477.1M bases, 270.1Mb
Run# of Spots# of BasesSizePublished
SRR1004547310,843,975477.1M270.1Mb2020-01-02

ID:
8929747

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