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Mapping polycomb response elements at the Drosophilla melanogaster giant locus.

Jumana AlHaj Abed1, Connie L Cheng, Chase R Crowell

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G3 (Bethesda, Md.)
|October 31, 2013
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Summary

Polycomb-group (PcG) proteins regulate gene expression epigenetically. This study identifies two polycomb response elements (PREs) in the giant gene, demonstrating their role in gene silencing and expression regulation.

Keywords:
epigeneticgene silencingpairing-sensitive silencingpolycombpolycomb response element

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Area of Science:

  • Epigenetics
  • Developmental Biology
  • Genetics

Background:

  • Polycomb-group (PcG) proteins are crucial epigenetic regulators maintaining gene silencing or dynamic expression.
  • Polycomb response elements (PREs) are essential for PcG protein recruitment in Drosophila melanogaster.
  • The sequence requirements for PREs are not fully understood, but Pho binding is a strong indicator.

Purpose of the Study:

  • To identify and characterize PREs at the PcG target gene, giant.
  • To investigate the function of identified PREs in gene expression regulation.
  • To explore the relationship between PRE function and sequence requirements.

Main Methods:

  • Identification of PRE-containing regions using chromatin immunoprecipitation (ChIP) for Pho binding.
  • Functional analysis of PRE-containing fragments using reporter gene assays (lacZ) in embryos.
  • Assessing gene silencing activity using the mini-white gene assay in Drosophila eyes.

Main Results:

  • Two PRE-containing regions were identified in the giant gene: one at the promoter and one upstream.
  • These PREs, marked by Pho binding, maintained restricted lacZ expression in embryos.
  • The identified PREs induced pairing-sensitive silencing of the mini-white gene.

Conclusions:

  • The study successfully identified functional PREs at the giant gene.
  • PREs play a significant role in both maintaining restricted gene expression and mediating silencing.
  • While PRE maintenance and silencing activities are linked, their sequence requirements may differ.