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Genome variation and evolution of the malaria parasite Plasmodium falciparum

A Corrigendum to this article was published on 01 April 2007

A Corrigendum to this article was published on 01 March 2007

This article has been updated

Abstract

Infections with the malaria parasite Plasmodium falciparum result in more than 1 million deaths each year worldwide1. Deciphering the evolutionary history and genetic variation of P. falciparum is critical for understanding the evolution of drug resistance, identifying potential vaccine candidates and appreciating the effect of parasite variation on prevalence and severity of malaria in humans. Most studies of natural variation in P. falciparum have been either in depth over small genomic regions (up to the size of a small chromosome2) or genome wide but only at low resolution3. In an effort to complement these studies with genome-wide data, we undertook shotgun sequencing of a Ghanaian clinical isolate (with fivefold coverage), the IT laboratory isolate (with onefold coverage) and the chimpanzee parasite P. reichenowi (with twofold coverage). We compared these sequences with the fully sequenced P. falciparum 3D7 isolate genome4. We describe the most salient features of P. falciparum polymorphism and adaptive evolution with relation to gene function, transcript and protein expression and cellular localization. This analysis uncovers the primary evolutionary changes that have occurred since the P. falciparum–P. reichenowi speciation and changes that are occurring within P. falciparum.

NOTE: In the original version of this paper, the authors failed to acknowledge that sequencing of the P. falciparum IT laboratory isolate was funded by a European Union 6th Framework Program grant to the BioMalPar Consortium (contract number LSHP-LT-2004-503578). This error has been corrected in the PDF version of the article.

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Figure 1: Evolutionary rates correlate with total gene expression levels.
Figure 2: Evolutionary rates in the context of gene expression during development.
Figure 3: Evolutionary rate in the context of gene function.

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Change history

  • 08 February 2007

    In the original version of this paper, the authors failed to acknowledge that sequencing of the P. falciparum IT laboratory isolate was funded by a European Union 6th Framework Program grant to the BioMalPar Consortium (contract number LSHP-LT-2004-503578). This error has been corrected in the PDF version of the article.

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Acknowledgements

We thank the Pathogen Sequencing teams for producing the sequence data used in this study, P. Horrocks and B. Pinches for the supply of DNA from the IT isolate and M. Marti for the list of PEXEL motif–containing genes. This study was funded by the Wellcome Trust through its support of the Pathogen Sequencing Unit and E.T.D.'s group at the Wellcome Trust Sanger Institute.

Author information

Authors and Affiliations

Authors

Contributions

D.J. processed SSAHA data, produced diversity and evolutionary measures, analyzed the data and wrote the manuscript. E.T.D. and M.B. directed the project and assisted with analysis of the data and writing of the manuscript. A.P. and A.B. assisted with analysis and processing of the data and biological interpretation of the data. A.T. collected the P. reichenowi sample and extracted DNA. K.S. assisted with data processing and analysis. A.C. provided SSAHA mapping. J.S. assisted with data processing. C.I. resequenced genes and manually verified SNPs. A.-C.U. assisted with parasite DNA extraction. S. Krishna assisted in biological interpretation of the data and parasitology. C.N. shaped some of the initial ideas for the project, assisted in biological interpretation of the data and assisted with parasite DNA extraction. S. Kyes grew the IT parasite and purified and extracted DNA from parasites.

Corresponding authors

Correspondence to Emmanouil T Dermitzakis or Matthew Berriman.

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The authors declare no competing financial interests.

Supplementary information

Supplementary Fig. 1

The distributions of dN/dS estimates are negatively skewed. (PDF 138 kb)

Supplementary Fig. 2

Correlations of dN/dS and expression level are robust to the use of different expression data and to subsets of variation data called using SSAHA. (PDF 415 kb)

Supplementary Fig. 3

Consistent relative differences in evolutionary rates between stage-specific genes were observed with protein and microarray data. (PDF 161 kb)

Supplementary Table 1 (XLS 2027 kb)

Supplementary Methods (PDF 114 kb)

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Jeffares, D., Pain, A., Berry, A. et al. Genome variation and evolution of the malaria parasite Plasmodium falciparum. Nat Genet 39, 120–125 (2007). https://doi.org/10.1038/ng1931

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