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SAGE in Rhipicephalus (Boophilus) microplus following OP treatment of larvae from OP resistant/susceptible strains.

ABSTRACT: Organophosphate resistant and susceptible tick larvae from laboratory strains of the southern cattle tick, Rhipicephalus (Boophilus) microplus were exposed to low doses of the organophosphate (OP) acaricide, coumaphos. Serial Analysis of Gene Expression (SAGE) was used to analyze differential gene expression in response to OP treatment and to compare the responses in OP-treated and untreated resistant and susceptible tick larvae. ** note: Contact person is Felix D. Guerrero. email: felix.guerrero@ars.usda.gov Keywords: SAGE, acaricide response, organophosphate.

ORGANISM(S): Rhipicephalus microplus

PROVIDER: GSE10109 | GEO | 2008/05/14

SECONDARY ACCESSION(S): PRJNA108259

REPOSITORIES: GEO

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SAGE in Rhipicephalus (Boophilus) microplus following OP treatment of larvae from OP resistant/susceptible strains.

Project description:Organophosphate resistant and susceptible tick larvae from laboratory strains of the southern cattle tick, Rhipicephalus (Boophilus) microplus were exposed to low doses of the organophosphate (OP) acaricide, coumaphos. Serial Analysis of Gene Expression (SAGE) was used to analyze differential gene expression in response to OP treatment and to compare the responses in OP-treated and untreated resistant and susceptible tick larvae. ** note: Contact person is Felix D. Guerrero. email: felix.guerrero@ars.usda.gov Keywords: SAGE, acaricide response, organophosphate. four samples make up this series: Munoz Treated: 6030 tags Munoz Untreated: 7806 tags SanRoman Treated: 7714 tags SanRoman Untreated: 9065 tags

2008-05-14 | E-GEOD-10109 | biostudies-arrayexpress

Microarray analysis of gene expression in acaricide exposed Rhipicephalus (Boophilus) microplus.

Project description:A R. microplus microarray was used to study differential gene expression in acaricide exposed larvae from an amitraz-resistant strain. The acaricide treatments were: organophosphate (OP), pyrethroid, ivermectin, and amitraz. The microarrays contained over 13,000 probes corresponding to each member of R. microplus gene index ESTs previously described (http://compbio.dfci.harvard.edu/tgi/cgi-bin/tgi/gimain.pl?gudb=b_microplus). Serial analysis of gene expression (SAGE) data from the OP treated R. microplus was used to verify the OP microarray data. The expression profiles of selected transcripts were verified by real time PCR. Among the significantly differentially expressed genes, were a tick legumain, involved in blood digestion, gluthathione S-transferase (GST), a detoxification enzyme involved in pesticide resistance, acyltransferase, several putative salivary sulfotransferases, and a glutamate receptor. **Note: contact person: Felix D. Guerrero email: felix.guerrero@ars.usda.gov Keywords: Rhipicephalus (Boophilus) microplus, acaricide resistance genes, organophosphates OP, microarrays, detoxification enzymes.

2008-12-31 | GSE10171 | GEO

Microarray analysis of gene expression in acaricide exposed Rhipicephalus (Boophilus) microplus.

2010-05-14 | E-GEOD-10171 | biostudies-arrayexpress

Rhipicephalus microplus

Project description:SAGE in Rhipicephalus (Boophilus) microplus following OP treatment of larvae from OP resistant/susceptible strains.

| PRJNA108259 | ENA

Microarray analysis of gene expression in the skin of tick-naïve and tick-infested Holstein-Friesian and Brahman cattle

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Transcription profiling of Bos taurus skin of tick naive and tick-infested Holstein-Friesian and Brahman breeds

Project description:This experiment was undertaken to document changes in gene expression in the skin of tick-resistant Brahman (Bos indicus) and tick-susceptible Holstein-Friesian (Bos taurus) cattle prior to, and following, infestation with the cattle tick Rhipicephalus (Boophilus) microplus Experiment Overall Design: RNA was extracted from skin samples of tick-naÃ¯ve cattle (animals with no previous R.microplus exposure) and tick-infested cattle after a period of successive, heavy infestations with R. microplus. Skin samples taken from tick-infested animals were taken at sites where tick larvae (approximately 24 h old) were attached to the skin sample. Skin samples were of 8 mm diameter and full skin thickness (approximately 10 mm). RNA samples from 12 animals (3 tick-naive Holstein-Friesian, 3 tick-naive Brahman, 3 tick-infested Holstein-Friesian and 3 tick-infested Brahman) were processed and hybridised to individual slides.

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Microarray analysis of expressed genes from R. microplus larvae, adult ovary, adult female gut associated with B bovis.

Project description:Babesia bovis exposed tissues: Three tissues were looked at. 1. Adult Female Gut 2. Adult Ovary 3. Larvae. In all there are 24 measurements for feature (EST), and 4 measurements per treatment for each of the 6 treatment groups. The 6 treatment groups are: Gut infected (GI), Gut control (GC), and similarly for Ovary and Larval: OI, OC, LI, LC. There are 12 chips, each with a spot replicate. **Note: contact person: Felix D. Guerrero email: felix.guerrero@ars.usda.gov Keywords: Rhipicephalus (Boophilus) microplus, Babesia, microarrays.

2009-12-01 | GSE10816 | GEO

R. microplus expression profiles of larvae pre-attachment and feeding adult female stages in B. indicus and B. taurus

Project description:Comparative microarray analysis of Rhipicephalus (Boophilus) microplus expression profiles of larvae pre-attachment and feeding adult female stages on Bos indicus and B. taurus cattle Global analysis of gene expression changes in R. microplus during larval, pre-attachment and early adult stages of its life cycle feeding on Bos indicus and Bos taurus cattle were compared using gene expression microarray analysis. Among the 13 601 R. microplus transcripts from BmiGI Version 2 we identified 297 up and 17 down regulated transcripts were differentially expressed between R. microplus feeding on tick resistant cattle [Bos indicus (Brahman)] compared to R. microplus feeding on tick susceptible cattle [Bos taurus (Holstein-Friesian)]. These include genes encoding enzymes involved in primary metabolism, and genes related to stress, defence, cell wall modification, cellular signaling, receptor and cuticle. Microarrays were validated by qRT-PCR analysis of selected transcripts including the validation of three housekeeping genes. The analysis of all tick stages under survey suggested a coordinated regulation of defence proteins, proteases, and protease inhibitors to achieve successful attachment and survival of R. microplus on different host breeds particularly Bos indicus cattle.

2010-07-09 | GSE20605 | GEO

analysis of expression profiles and differential allelic expression of third-instar larvae (L3) that survived treatment with OP insecticide.

Project description:The emergence of insecticide resistance is a fast-paced example of the evolutionary process of natural selection. In our study, we investigated the molecular basis of resistance in the myiasis-causing fly Cochliomyia hominivorax (Diptera: Calliphoridae) to organophosphates (OP). By sequencing the RNA from surviving larvae treated with OP (resistant condition) and non-treated larvae (control condition), we identified genes displaying condition-specific polymorphisms, as well as those differentially expressed. Both analyses revealed that resistant individuals have altered expression and allele-specific expression of genes involved in proteolysis (specifically serine-endopeptidase), olfactory perception and cuticle metabolism, among others. We also confirmed that resistant individuals carry almost invariably the Trp251Ser mutation in the esterase E3 known to confer OP and Pyrethroid resistance. Interestingly, genes involved in metabolic and detoxifying processes (notably cytochrome P450s) were found under-expressed in resistant individuals. An exception to this were esterases, which were found up-regulated. These observations suggest that reduced penetration and aversion to OP contaminated food, may be important complementary strategies of resistant individuals. The specific genes and processes found are an important starting point for future functional studies. Their role in insecticide resistance merits consideration to better the current pest management strategies.

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Microarray analysis of expressed genes from R. microplus larvae, adult ovary, adult female gut associated with B bovis.

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