Dynamic epigenetic regulation of gene expression during the life cycle of malaria parasite Plasmodium falciparum

PLoS Pathog. 2013 Feb;9(2):e1003170. doi: 10.1371/journal.ppat.1003170. Epub 2013 Feb 28.

Abstract

Epigenetic mechanisms are emerging as one of the major factors of the dynamics of gene expression in the human malaria parasite, Plasmodium falciparum. To elucidate the role of chromatin remodeling in transcriptional regulation associated with the progression of the P. falciparum intraerythrocytic development cycle (IDC), we mapped the temporal pattern of chromosomal association with histone H3 and H4 modifications using ChIP-on-chip. Here, we have generated a broad integrative epigenomic map of twelve histone modifications during the P. falciparum IDC including H4K5ac, H4K8ac, H4K12ac, H4K16ac, H3K9ac, H3K14ac, H3K56ac, H4K20me1, H4K20me3, H3K4me3, H3K79me3 and H4R3me2. While some modifications were found to be associated with the vast majority of the genome and their occupancy was constant, others showed more specific and highly dynamic distribution. Importantly, eight modifications displaying tight correlations with transcript levels showed differential affinity to distinct genomic regions with H4K8ac occupying predominantly promoter regions while others occurred at the 5' ends of coding sequences. The promoter occupancy of H4K8ac remained unchanged when ectopically inserted at a different locus, indicating the presence of specific DNA elements that recruit histone modifying enzymes regardless of their broad chromatin environment. In addition, we showed the presence of multivalent domains on the genome carrying more than one histone mark, highlighting the importance of combinatorial effects on transcription. Overall, our work portrays a substantial association between chromosomal locations of various epigenetic markers, transcriptional activity and global stage-specific transitions in the epigenome.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Epigenesis, Genetic*
  • Gene Expression Regulation, Developmental*
  • Genome, Protozoan
  • Histones / genetics
  • Life Cycle Stages / physiology*
  • Plasmodium falciparum / genetics*
  • Real-Time Polymerase Chain Reaction
  • Time Factors
  • Transcription, Genetic

Substances

  • Histones

Grants and funding

This research was funded by the Singaporean Biomedical Research Council (BMRC) grant #09/1/22/19/614 and the Singaporean National Medical Research Council grant # NMRC/1292/2011. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.