Dosage comp. Proteins in S2-DRSC cells

Dosage compensation proteins in S2-DRSC cells (Karpen project, Kuroda subgroup)

Nuclei were isolated from the Drosophila S2 embryonic cell line that had been crosslinked with formaldehyde. After lysis and sonication the chromatin was immunoprecipitated with an affinity-purified antibody that recognizes the chromatin binding, dosage compensation complex, protein MSL1. After PCR amplification and labeling the DNA was used to probe Affymetrix microarrays (a sample of the DNA input for the ChIP was processed in parallel and used to probe another copy of the array). The experiment was performed in triplicate, and normalized, averaged data is shown. For tracks displaying binding peaks, normalized signal intensities from three averaged experimental replicates were analyzed using a peak-calling algorithm that calculates genomic regions of significant enrichment (or depletion).

General Description

We aim to determine the locations of 125 chromosomal proteins across
the Drosophila melanogaster genome. The proteins under study are
involved in basic chromosomal functions such as DNA replication, gene
expression, gene silencing, and inheritance. We will perform Chromatin
ImmunoPrecipitation (ChIP) using genomic tiling arrays. We will
initially assay localizations using chromatin from three cell lines
and two embryonic stages, and will then extend the analysis of a
subset of proteins to four additional animal tissues/stages


  1. Growth and isolation: Chromatin prep from cultured cells, Crosslinking of cultured cells
  2. Sample preparation: Hybridization to Affy arrays, WGA, ChIP, Array Scanning Protocol
  3. Data Analysis: Smoothed M-value enrichment profiles, M-value normalization, Regions of significant enrichment, Smoothed M-value enrichment profiles
  4. Other Protocols: Regions of significant enrichment, Regions of significant enrichment

Experimental Reagents

  1. Antibodies: JIL1_Q3433, Ab:MOF_Q4145:GK:1, Ab:JIL-1(Q4170):GK:1

Sample Details

  1. Animals/Lines: S2-DRSC

  1. Arrays: Affymetrix Drosophila Tiling Arrays v2.0R

Release Date: 2011-04-26