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dc.contributor.author | Louw, Elizabeth M.![]() |
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dc.contributor.author | Van der Merwe, Nicolaas Albertus (Albie)![]() |
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dc.contributor.author | Neitz, Albert Walter Herman![]() |
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dc.contributor.author | Maritz-Olivier, Christine![]() |
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dc.date.accessioned | 2013-01-28T07:06:14Z | |
dc.date.available | 2013-01-28T07:06:14Z | |
dc.date.issued | 2013-01 | |
dc.description.abstract | One of the principle mechanisms utilised by ticks to obtain a blood meal is the subversion of the host’s haemostatic response. This is achieved through the secretion of saliva containing anti-haemostatic proteins into the feeding lesion. Lineage-specific expansion of predicted secretory protein families have been observed in all previously studied ticks and occurred in response to adaptation to a blood-feeding environment. Of these, the predominant families are common between both hard and soft ticks. One of these families, namely the Kunitz domain-containing protein family, includes proven tissue factor pathway inhibitor-like (TFPI-like) anti-haemostatics such as ixolaris and penthalaris that play a crucial role during tick feeding. Although Kunitz-type proteins have been found in Rhipicephalus microplus, the TFPI-like Kunitz protein family has not yet been studied. We report a comprehensive search for TFPI-like Kunitz domain-containing proteins in R. microplus expressed sequence tag libraries, resulting in the identification of 42 homologues. The homologues were bioinformatically and phylogenetically studied, including the application of an intensive Bayesian Markov Chain Monte Carlo (MCMC) analysis of the individual Kunitz domain nucleotide sequences. We show that the R. microplus TFPI-like Kunitz protein family groups into two main clades that presumably underwent ancient duplication, which indicates that a whole genome duplication event occurred at least 150 million years ago. Evidence for recent and ancient gene and domain duplication events was also found. Furthermore, the divergence times of the various tick lineages estimated in this paper correspond with those presented in previous studies. The elucidation of this large protein family’s evolution within R. microplus adds to current knowledge of this economically important tick. | en_US |
dc.description.sponsorship | This project was partially funded by the Wellcome Trust, United Kingdom, under the ‘Animal Health in the Developing World’ initiative through Project 0757990 entitled ‘Adapting recombinant anti-tick vaccines to livestock in Africa’. | en_US |
dc.description.uri | http://www.elsevier.com/locate/ijpara | en_US |
dc.identifier.citation | Elizabeth Louw, Nicolaas A. van der Merwe, Albert W.H. Neitz & Christine Maritz-Olivier, Evolution of the tissue factor pathway inhibitor-like Kunitz domain-containing protein family in Rhipicephalus microplus, International Journal for Parasitology, vol. 43, no. 1, pp. 81-94 (2013), doi: 10.1016/j.ijpara.2012.11.006. | en_US |
dc.identifier.issn | 0020-7519 (print) | |
dc.identifier.issn | 1879-0135 (online) | |
dc.identifier.other | 10.1016/j.ijpara.2012.11.006 | |
dc.identifier.uri | http://hdl.handle.net/2263/20891 | |
dc.language.iso | en | en_US |
dc.publisher | Elsevier | en_US |
dc.rights | © 2012 Australian Society for Parasitology Inc. Published by Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in International Journal for Parasitology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal for Parasitology, vol. 43, no. 1, pp. 81-94 (2013), doi: 10.1016/j.ijpara.2012.11.006. | en_US |
dc.subject | Rhipicephalus microplus | en_US |
dc.subject | Kunitz domain | en_US |
dc.subject | Tissue factor pathway inhibitor (TFPI) | en_US |
dc.subject | Phylogenetic | en_US |
dc.subject | Bayesian Markov Chain Monte Carlo | en_US |
dc.subject | Duplication | en_US |
dc.title | Evolution of the tissue factor pathway inhibitor-like Kunitz domain-containing protein family in Rhipicephalus microplus | en_US |
dc.type | Postprint Article | en_US |