Ovaries were dissected from females 32-34 hours after eclosion (containing egg chambers corresponding to 1-13 stages).
treatment
no treatment
Sequenced DNA Library
library_strategy
ChIP-Seq
library_source
GENOMIC
library_selection
ChIP
library_construction_protocol
ChIP protocol: crosslinking was performed with 1% formaldehyde for 10 min at RT and stopped by adding glycine. After washings, chromatin was lysed in SDS-containing buffer (50 mM HEPESKOH, pH 7.9; 140 mM NaCl, 1mM EDTA, 1% Triton X-100, 0.1% Na deoxycholate, 0.1% SDS) with protease inhibitors cocktail (Roche) and sheared to 500-bp fragments by sonication. Sonicated chromatin was centrifuged twice at 16 000 g for 20 min, and used in immunoprecipitation experiments. For one experiment, about 5 ug of antibodies and 8 uL of MabSelect sepharose (GE healthcare) were taken; BSA were added to a final concentration of 1%. The precipitated chromatin was sequentially washed twice with SDS-containing buffer and with TE buffer (20mM Tris-HCl, pH 8.0; 1mM EDTA). Precipitated chromatin complexes were eluted by sequential incubation in two portions of elution buffer (50mM Tris-HCl, pH 8.0; 1mM EDTA, 1% SDS), 30 min each, at room temperature. The eluted chromatin solution was supplemented with 5 M NaCl (16 uL per 500 uL sample) and incubated at 65°C for 16 h on a thermoshaker for de-crosslinking. De-crosslinked chromatin was subjected to proteinase treatment (3 uL of proteinase K and 5 uL of 0.5M EDTA per 500 uL sample) and incubated at 55°C for 4 h on thermoshaker. DNA was extracted with a phenol/chloroform mixture and precipitated with isopropanol. The precipitate was dissolved in TE buffer and subjected to library preparation. Total RNA was extracted with the TRI reagent (Ambion). PolyA comprising RNA fraction was isolated with the NEBNext UltraTM II Directional RNA Library Prep Kit. FAIRE-Seq protocol was perfomed exactly as previously described in Simon et al (2012) Nat protocols, 7:256-267. DNA and RNA-Seq libraries were prepared for sequencing using standard Illumina protocols