Genomic sequencing of Plasmodium falciparum malaria parasites from Senegal reveals the demographic history of the population.
Mol Biol Evol
; 29(11): 3427-39, 2012 Nov.
Article
em En
| MEDLINE
| ID: mdl-22734050
ABSTRACT
Malaria is a deadly disease that causes nearly one million deaths each year. To develop methods to control and eradicate malaria, it is important to understand the genetic basis of Plasmodium falciparum adaptations to antimalarial treatments and the human immune system while taking into account its demographic history. To study the demographic history and identify genes under selection more efficiently, we sequenced the complete genomes of 25 culture-adapted P. falciparum isolates from three sites in Senegal. We show that there is no significant population structure among these Senegal sampling sites. By fitting demographic models to the synonymous allele-frequency spectrum, we also estimated a major 60-fold population expansion of this parasite population â¼20,000-40,000 years ago. Using inferred demographic history as a null model for coalescent simulation, we identified candidate genes under selection, including genes identified before, such as pfcrt and PfAMA1, as well as new candidate genes. Interestingly, we also found selection against G/C to A/T changes that offsets the large mutational bias toward A/T, and two unusual patterns similar synonymous and nonsynonymous allele-frequency spectra, and 18% of genes having a nonsynonymous-to-synonymous polymorphism ratio >1.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Parasitos
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Plasmodium falciparum
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Malária Falciparum
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Análise de Sequência de DNA
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Genoma de Protozoário
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Humans
País como assunto:
Africa
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article