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Insect metagenome

ABSTRACT: associated microbiota of the cattle tick, Rhipicephalus microplus, larvae.

PROVIDER: PRJNA298221 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR2681680.fastq.gz	Fastqsanger.gz
	SRR2681092.fastq.gz	Fastqsanger.gz
	SRR2681682.fastq.gz	Fastqsanger.gz
	SRR2681683.fastq.gz	Fastqsanger.gz
	SRR2681684.fastq.gz	Fastqsanger.gz

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Cattle lymph nodes: Control vs. Larva tick-infested; Control vs. Adult tick-infested; Larva tick-infested vs. Adult tick-infested

Project description:Transcriptional profiling of lymph nodes of three cattle breeds (Bonsmara, Brahman, Holstein-Friesian) in response to the cattle tick (Rhipicephalus microplus) larvae and adult infestation. Emphasis is placed on firstly, comparing transcriptional responses within a cattle breed, before and after infestation, and secondly, comparing differentially expressed genes common between the breeds.

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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.

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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.

2009-04-11 | E-GEOD-15342 | biostudies-arrayexpress

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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.

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Project description:This trial was undertaken to examine the perhipheral cellular and antibody response of cattle following infestation with the cattle tick, Rhipicephalus microplus. The information from the Affymetrix gene expression data is used to complement other measurements of immune function such as cellular subset composition and antibody response in cattle of high (Brahman) and low (Holstein-Friesian) resistance to the cattle tick. Keywords: Disease state analysis

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Project description:Tick infestations by Rhipicephalus microplus, the cattle tick, cause enormous losses to health and animal production. Ticks induce immune response in their hosts; therefore their immunobiological control is feasible. The available anti-tick vaccines display variable efficacy and short-lived, encouraging the search for new protective antigens. The identification of important genes in tick parasitism may indicate protective antigens useful to compose an anti-tick vaccine. We have developed and tested so far four recombinant salivary antigens as a multicomponent anti-tick vaccine in tick-susceptible bovines (Holstein breed). The challenge with R. microplus larvae displayed that tick infestation in vaccinated bovines was significantly reduced. In order to elucidate the molecular mechanisms trigged after immunisation and during infestation, RNA-seq data of peripheral blood from vaccinated and control animals were obtained in different periods of the immunisation trial. A total of 24 mRNA-seq Illumina libraries (single-end, 100 bp) were analysed to identify differential gene expression according to the experimental condition.

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