Polysome profiling reveals translational control of gene expression in the human malaria parasite Plasmodium falciparum

Evelien M. Bunnik, Duk Won D. Chung, Michael Hamilton, Nadia Ponts, Anita Saraf, Jacques Prudhomme, Laurence Florens, Karine G. Le Roch

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

Background: In eukaryotic organisms, gene expression is regulated at multiple levels during the processes of transcription and translation. The absence of a tight regulatory network for transcription in the human malaria parasite suggests that gene expression may largely be controlled at post-transcriptional and translational levels.Results: In this study, we compare steady-state mRNA and polysome-associated mRNA levels of Plasmodium falciparum at different time points during its asexual cell cycle. For more than 30% of its genes, we observe a delay in peak transcript abundance in the polysomal fraction as compared to the steady-state mRNA fraction, suggestive of strong translational control. Our data show that key regulatory mechanisms could include inhibitory activity of upstream open reading frames and translational repression of the major virulence gene family by intronic transcripts. In addition, we observe polysomal mRNA-specific alternative splicing events and widespread transcription of non-coding transcripts.Conclusions: These different layers of translational regulation are likely to contribute to a complex network that controls gene expression in this eukaryotic pathogen. Disrupting the mechanisms involved in such translational control could provide novel anti-malarial strategies.

Original languageEnglish (US)
Article numberR128
JournalGenome biology
Volume14
Issue number11
DOIs
StatePublished - Nov 22 2013

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Cell Biology

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