c-Myb Binding Sites in Haematopoietic Chromatin Landscapes

PLoS One. 2015 Jul 24;10(7):e0133280. doi: 10.1371/journal.pone.0133280. eCollection 2015.

Abstract

Strict control of tissue-specific gene expression plays a pivotal role during lineage commitment. The transcription factor c-Myb has an essential role in adult haematopoiesis and functions as an oncogene when rearranged in human cancers. Here we have exploited digital genomic footprinting analysis to obtain a global picture of c-Myb occupancy in the genome of six different haematopoietic cell-types. We have biologically validated several c-Myb footprints using c-Myb knockdown data, reporter assays and DamID analysis. We show that our predicted conserved c-Myb footprints are highly dependent on the haematopoietic cell type, but that there is a group of gene targets common to all cell-types analysed. Furthermore, we find that c-Myb footprints co-localise with active histone mark H3K4me3 and are significantly enriched at exons. We analysed co-localisation of c-Myb footprints with 104 chromatin regulatory factors in K562 cells, and identified nine proteins that are enriched together with c-Myb footprints on genes positively regulated by c-Myb and one protein enriched on negatively regulated genes. Our data suggest that c-Myb is a transcription factor with multifaceted target regulation depending on cell type.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Binding Sites*
  • Cell Differentiation / genetics
  • Chromatin / genetics*
  • Chromatin / metabolism*
  • DNA Footprinting
  • Gene Expression Regulation
  • Genome-Wide Association Study
  • Hematopoiesis / genetics*
  • Histones / metabolism
  • Humans
  • K562 Cells
  • Protein Binding
  • Proto-Oncogene Proteins c-myb / metabolism*
  • Transcription Factors / metabolism
  • Transcription, Genetic

Substances

  • Chromatin
  • Histones
  • Proto-Oncogene Proteins c-myb
  • Transcription Factors

Grants and funding

Funding provided by (RE) https://www.forskningsradet.no/ (231217/F20)*, (RE) https://kreftforeningen.no (3485238-2013)* and (OSG) https://kreftforeningen.no (419436 107692-PR-2007-0148)*. *The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.