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Phylogeographic analysis reveals association of tick-borne pathogen, Anaplasma marginale, MSP1a sequences with ecological traits affecting tick vector performance
- Source :
- CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET, BMC Biology, Vol 7, Iss 1, p 57 (2009), Digital.CSIC. Repositorio Institucional del CSIC, instname, BMC Biology
- Publication Year :
- 2009
- Publisher :
- BioMed Central, 2009.
-
Abstract
- [Background]: The tick-borne pathogen Anaplasma marginale, which is endemic worldwide, is the type species of the genus Anaplasma (Rickettsiales: Anaplasmataceae). Rhipicephalus (Boophilus) microplus is the most important tick vector of A. marginale in tropical and subtropical regions of the world. Despite extensive characterization of the genetic diversity in A. marginale geographic strains using major surface protein sequences, little is known about the biogeography and evolution of A. marginale and other Anaplasma species. For A. marginale, MSP1a was shown to be involved in vectorpathogen and host-pathogen interactions and to have evolved under positive selection pressure. The MSP1a of A. marginale strains differs in molecular weight because of a variable number of tandem 23-31 amino acid repeats and has proven to be a stable marker of strain identity. While phylogenetic studies of MSP1a repeat sequences have shown evidence of A. marginale-tick co-evolution, these studies have not provided phylogeographic information on a global scale because of the high level of MSP1a genetic diversity among geographic strains.<br />[Results]: In this study we showed that the phylogeography of A. marginale MSP1a sequences is associated with world ecological regions (ecoregions) resulting in different evolutionary pressures and thence MSP1a sequences. The results demonstrated that the MSP1a first (R1) and last (RL) repeats and microsatellite sequences were associated with world ecoregion clusters with specific and different environmental envelopes. The evolution of R1 repeat sequences was found to be under positive selection. It is hypothesized that the driving environmental factors regulating tick populations could act on the selection of different A. marginale MSP1a sequence lineages, associated to each ecoregion.<br />[Conclusion]: The results reported herein provided the first evidence that the evolution of A. marginale was linked to ecological traits affecting tick vector performance. These results suggested that some A. marginale strains have evolved under conditions that support pathogen biological transmission by R. microplus, under different ecological traits which affect performance of R. microplus populations. The evolution of other A. marginale strains may be linked to transmission by other tick species or to mechanical transmission in regions where R. microplus is currently eradicated. The information derived from this study is fundamental toward understanding the evolution of other vector-borne pathogens.<br />This research was supported by grants from the Ministerio de Ciencia e Innovación, Spain (project BFU2008-01244/BMC), the CSIC intramural project 200830I249 to JF and the Oklahoma Agricultural Experiment Station (project 1669) and was facilitated through the Integrated Consortium on Ticks and Tick-borne Diseases (ICTTD-3), financed by the International Cooperation Program of the European Union, coordination action project No. 510561. VN was funded by the European Social Fund and the Junta de Comunidades de Castilla-La Mancha (Program FSE 2007-2013), Spain.
- Subjects :
- Anaplasmosis
Physiology
Plant Science
Structural Biology
lcsh:QH301-705.5
Phylogeny
Genetics
Agricultural and Biological Sciences(all)
biology
Ecology
Anaplasmataceae
Rhipicephalus
Anaplasma marginale
Microsatellite
Topography, Medical
Seasons
Phylogeographic analysis
General Agricultural and Biological Sciences
Bacterial Outer Membrane Proteins
Research Article
Biotechnology
Repetitive Sequences, Amino Acid
Genotype
MSP1a
Rhipicephalus (Boophilus) microplus
Cattle Diseases
Tick
Statistics, Nonparametric
General Biochemistry, Genetics and Molecular Biology
Evolution, Molecular
Phylogenetics
Consensus Sequence
parasitic diseases
Animals
Amino Acid Sequence
RNA, Messenger
Selection, Genetic
Ecology, Evolution, Behavior and Systematics
Analysis of Variance
Genetic diversity
Base Sequence
Sequence Homology, Amino Acid
Biochemistry, Genetics and Molecular Biology(all)
Ciencias Veterinarias
Cell Biology
biology.organism_classification
Phylogeography
lcsh:Biology (General)
Animal ecology
CIENCIAS AGRÍCOLAS
Arachnid Vectors
Cattle
purl.org/becyt/ford/4.3 [https]
purl.org/becyt/ford/4 [https]
Microsatellite Repeats
Developmental Biology
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- CONICET Digital (CONICET), Consejo Nacional de Investigaciones Científicas y Técnicas, instacron:CONICET, BMC Biology, Vol 7, Iss 1, p 57 (2009), Digital.CSIC. Repositorio Institucional del CSIC, instname, BMC Biology
- Accession number :
- edsair.doi.dedup.....94e104cea624978cf93f4dc920c70483