MBE Advance Access published online on April 2, 2008
Molecular Biology and Evolution, doi:10.1093/molbev/msn073
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Research Article |
Local Adaptation and Vector-Mediated Population Structure in Plasmodium vivax Malaria






* Laboratory or Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 9000 Rockville Pike, Bethesda, Maryland 20892-8132, USA
¶ Instituto Nacional de Salud Publica, Chiapas State, Mexico
New York University School of Medicine, Department of Medical Parasitology
Hood College, Frederick, Maryland
Biostatistics Research Branch, Department of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health
Regulation of Growth and Development Section, Laboratory or Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health
Corresponding author:Tel: 301-402-0876, Fax: 301-402-2201, E-mail: xsu{at}niaid.nih.gov, djoy{at}mail.nih.gov
Received for publication October 19, 2007. Revision received February 20, 2008. Accepted for publication March 23, 2008.
Plasmodium vivax in southern Mexico exhibits different infectivities to two local mosquito vectors, Anopheles pseudopunctipennis and Anopheles albimanus. Previous work has tied these differences in mosquito infectivity to variation in the central repeat motif of the malaria parasite's circumsporozoite (csp) gene, but subsequent studies have questioned this view. Here we present evidence that P. vivax in southern Mexico is comprised of three genetic populations whose distributions largely mirror those of the two mosquito vectors. Additionally, laboratory colony feeding experiments indicate that parasite populations are most compatible with sympatric mosquito species. Our results suggest that reciprocal selection between malaria parasites and mosquito vectors has led to local adaptation of the parasite. Adaptation to local vectors may play an important role in generating population structure in Plasmodium. A better understanding of co-evolutionary dynamics between sympatric mosquitoes and parasites will facilitate the identification of molecular mechanisms relevant to disease transmission in nature, and provide crucial information for malaria control.
Key Words: malaria Plasmodium vivax microsatellites co-evolution