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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

An insight into the sialotranscriptome of the brown dog tick, Rhipicephalus sanguineus

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Author(s):
Anatriello, Elen [1] ; Ribeiro, Jose M. C. [2] ; de Miranda-Santos, Isabel K. F. [3, 1] ; Brandao, Lucinda G. [4, 1] ; Anderson, Jennifer M. [2] ; Valenzuela, Jesus G. [2] ; Maruyama, Sandra R. [1] ; Silva, Joao S. [1] ; Ferreira, Beatriz R. [5]
Total Authors: 9
Affiliation:
[1] Univ Sao Paulo, Dept Biochem & Immunol, Ribeirao Preto Sch Med, BR-14049900 Ribeirao Preto, SP - Brazil
[2] NIAID, Lab Malaria & Vector Res, Bethesda, MD 20892 - USA
[3] Embrapa Recursos Genet & Biotecnol, BR-70770900 Brasilia, DF - Brazil
[4] Univ Paulista, BR-16018280 Aracatuba, SP - Brazil
[5] Univ Sao Paulo, Dept Maternal & Child & Publ Hlth Nursing, Ribeirao Preto Sch Nursing, BR-14049900 Ribeirao Preto, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: BMC Genomics; v. 11, JUL 22 2010.
Web of Science Citations: 58
Abstract

Background: Rhipicephalus sanguineus, known as the brown dog tick, is a common ectoparasite of domestic dogs and can be found worldwide. R. sanguineus is recognized as the primary vector of the etiological agent of canine monocytic ehrlichiosis and canine babesiosis. Here we present the first description of a R. sanguineus salivary gland transcriptome by the production and analysis of 2,034 expressed sequence tags (EST) from two cDNA libraries, one consctructed using mRNA from dissected salivary glands from female ticks fed for 3-5 days (early to mid library, RsSGL1) and the another from ticks fed for 5 days (mid library, RsSGL2), identifying 1,024 clusters of related sequences. Results: Based on sequence similarities to nine different databases, we identified transcripts of genes that were further categorized according to function. The category of putative housekeeping genes contained similar to 56% of the sequences and had on average 2.49 ESTs per cluster, the secreted protein category contained 26.6% of the ESTs and had 2.47 EST's/clusters, while 15.3% of the ESTs, mostly singletons, were not classifiable, and were annotated as ``unknown function{''}. The secreted category included genes that coded for lipocalins, proteases inhibitors, disintegrins, metalloproteases, immunomodulatory and antiinflammatory proteins, as Evasins and Da-p36, as well as basic-tail and 18.3 kDa proteins, cement proteins, mucins, defensins and antimicrobial peptides. Comparison of the abundance of ESTs from similar contigs of the two salivary gland cDNA libraries allowed the identification of differentially expressed genes, such as genes coding for Evasins and a thrombin inhibitor, which were over expressed in the RsSGL1 (early to mid library) versus RsSGL2 (mid library), indicating their role in inhibition of inflammation at the tick feeding site from the very beginning of the blood meal. Conversely, sequences related to cement (64P), which function has been correlated with tick attachment, was largely expressed in the mid library. Conclusions: Our survey provided an insight into the R. sanguineus sialotranscriptome, which can assist the discovery of new targets for anti-tick vaccines, as well as help to identify pharmacologically active proteins. (AU)