Binding of Trithorax and Polycomb proteins to the bithorax complex

Dynamic changes during early Drosophila embryogenesis

Valerio Orlando, Esther P. Jane, Vandana Chinwalla, Peter J. Harte, Renato Paro

Research output: Contribution to journalArticle

150 Citations (Scopus)

Abstract

In Drosophila, the maintenance of developmentally important transcription patterns is controlled at the level of chromatin structure. The Polycomb group (PcG) and trithorax group (trxG) genes encode proteins involved in chromatin remodelling. PcG genes have been proposed to act by packaging transcriptional repressed chromosomal domains into condensed heterochromatin-like structures. Some of the trxG proteins characterized so far are members of chromatin opening complexes (e.g. SWI/SNF and GAGA/NURF) which facilitate binding of transcription factors and components of the basal transcriptional machinery. Genetic and biochemical data suggest that these two groups of regulatory factors may act through a common set of DNA elements. In the present study, we have investigated the binding of Trithorax (TRX) and Polycomb (PC) protein in the bithorax complex (BX-C) during embryogenesis. In addition, we have identified the minimal fragments from the Ultrabithorax (Ubx) regulatory region that are capable of recruiting TRX to chromosomal sites containing them. Comparative analysis of the binding of the two proteins shows that TRX and PC bind target sequences (PcG-regulated elements, PREs) by cellular blastoderm, when BX-C transcription begins. At the same stage, TRX but not PC is strongly associated with core promoters. Later, at germ band extension, the time of derepression in Polycomb mutants, PC binding is also detected outside core PREs and additionally binds to the fragments containing promoters.

Original languageEnglish
Pages (from-to)5141-5150
Number of pages10
JournalEMBO Journal
Volume17
Issue number17
DOIs
Publication statusPublished - Sep 1 1998

Fingerprint

Drosophila
Embryonic Development
Chromatin
Transcription
Blastoderm
Proteins
Chromatin Assembly and Disassembly
Heterochromatin
Genes
Nucleic Acid Regulatory Sequences
Product Packaging
Molecular Biology
Carrier Proteins
Transcription Factors
Maintenance
Machinery
Packaging
DNA

Keywords

  • BX-C
  • Drosophila
  • Embryogenesis
  • Polycomb
  • Trithorax

ASJC Scopus subject areas

  • Genetics
  • Cell Biology

Cite this

Binding of Trithorax and Polycomb proteins to the bithorax complex : Dynamic changes during early Drosophila embryogenesis. / Orlando, Valerio; Jane, Esther P.; Chinwalla, Vandana; Harte, Peter J.; Paro, Renato.

In: EMBO Journal, Vol. 17, No. 17, 01.09.1998, p. 5141-5150.

Research output: Contribution to journalArticle

Orlando, Valerio ; Jane, Esther P. ; Chinwalla, Vandana ; Harte, Peter J. ; Paro, Renato. / Binding of Trithorax and Polycomb proteins to the bithorax complex : Dynamic changes during early Drosophila embryogenesis. In: EMBO Journal. 1998 ; Vol. 17, No. 17. pp. 5141-5150.
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