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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Graham, Doug H. Dahl, Erica R. Lehmann, Tovi Marcet, Paula L. Dubey, J. P. |
| Description | Author Affiliation: Lehmann T ( Division of Parasitic Diseases, Centers for Disease Control and Prevention, 4770 Buford Highway, Chamblee, GA 30341, USA. tlehmann@niaid.nih.gov); |
| Abstract | Toxoplasma gondii is a protozoan parasite that infects nearly all mammal and bird species worldwide. Usually asymptomatic, toxoplasmosis can be severe and even fatal to many hosts, including people. Elucidating the contribution of genetic variation among parasites to patterns of disease transmission and manifestations has been the goal of many studies. Focusing on the geographic component of this variation, we show that most genotypes are locale-specific, but some are found across continents and are closely related to each other, indicating a recent radiation of a pandemic genotype. Furthermore, we show that the geographic structure of T. gondii is extraordinary in having one population that is found in all continents except South America, whereas other populations are generally confined to South America, and yet another population is found worldwide. Our evidence suggests that South American and Eurasian populations have evolved separately until recently, when ships populated by rats, mice, and cats provided T. gondii with unprecedented migration opportunities, probably during the transatlantic slave trade. Our results explain several enigmatic features of the population structure of T. gondii and demonstrate how pervasive, prompt, and elusive the impact of human globalization is on nature. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 30 |
| Volume Number | 103 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2006-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Toxoplasma Physiology Toxoplasmosis, Animal Transmission Toxoplasmosis Animals Disease Outbreaks Evolution, Molecular Genes, Protozoan Genetics, Population Genotype Geography Mice Protozoan Proteins Metabolism Research Support, N.I.H., Intramural Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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