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Genome wide gene amplifications and deletions in Plasmodium falciparum
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2007 (English)In: Molecular and biochemical parasitology (Print), ISSN 0166-6851, E-ISSN 1872-9428, Vol. 155, no 1, 33-44 p.Article in journal (Refereed) Published
Abstract [en]

The extent to which duplications and deletions occur in the Plasmodium falciparum genome, outside of the subtelomeres, and their contribution to the virulence of the malaria parasite is not known. Here we show the presence of multiple genome wide copy number polymorphisms (CNPs) covering 82 genes, the most extensive spanning a cumulative size of 110 kilobases. CNPs were identified in both laboratory strains and fresh clinical isolates using a 70-mer oligonucleotide microarray in conjunction with fluorescent in situ hybridizations and real-time quantitative PCR. The CNPs were found on all chromosomes except on chromosomes 6 and 8 and involved a total of 50 genes with increased copy numbers and 32 genes with decreased copy numbers relative to the 3D7 parasite. The genes, amplified in up to six copies, encode molecules involved in cell cycle regulation. cell division, drug resistance, erythrocyte invasion, sexual differentiation and unknown functions. These together with previous findings, suggest that the malaria parasite employs gene duplications and deletions as general strategies to enhance its survival and spread. Further analysis of the impact of discovered genetic differences and the underlying mechanisms is likely to generate a better understanding of the biology and the virulence of the malaria parasite.

Place, publisher, year, edition, pages
2007. Vol. 155, no 1, 33-44 p.
Keyword [en]
Plasmodium falciparum, malaria, genotyping, copy number polymorphisms, microarray, multiple displacement amplification, multidrug-resistance gene, adhesive phenotypes, malaria parasites, mefloquine resistance, infected erythrocytes, copy number, pfmdr1 gene, binding, identification
URN: urn:nbn:se:kth:diva-16873DOI: 10.1016/j.molbiopara.2007.05.005ISI: 000248742600005ScopusID: 2-s2.0-34447252317OAI: diva2:334916
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Lundeberg, JoakimNilsson, Peter
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