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. The microarray was conducted by NimbleGen Systems Inc following the method reported by Saldivar [Saldivar L et al., Insect Mol Biol 2008, 17(6):597-606]. 10 samples: 2 larva, 2 pre-attachment larva in B. indicus and 2 in B. taurus, and 2 adult ticks in B. indicus and 2 in B. taurus
Project description:Transcriptional profiling of salivary gland, midgut and ovary tissues isolated from Rhipicephalus microplus females at day 20 post infestation. This enabled the identification of transcripts that are tissue-specific or shared among the tissues tested. Reference pool design: Each tissue tested was compared to a reference pool comprising ticks (immature to adult stages) sampled on day 4, 5, 7, 13, 15 and tissues collected on day 20 post infestation. Biological replicates: 2; Technical replicates: 2.
Project description:Transcriptional profiling of whole nymphs and larvae from Rhipicephalus microplus at day 4 and 7 post infestation, respectively. This enabled the identification of transcripts that are stage-specific or shared among the stages tested. Reference pool design: Each tissue tested was compared to a reference pool comprising ticks (immature to adult stages) sampled on day 4, 5, 7, 13, 15 and tissues collected on day 20 post infestation. Biological replicates: 2; Technical replicates: 2.
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.
Project description:Transcriptional profiling of midgut tissues isolated from Rhipicephalus microplus and Rhipicephalus decoloratus females at day 20 post infestation. This enabled the identification of transcripts that are species-specific or shared between the two tick species tested.
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
Project description:Transcriptional profiling of midgut tissues isolated from Rhipicephalus microplus and Rhipicephalus decoloratus females at day 20 post infestation. This enabled the identification of transcripts that are species-specific or shared between the two tick species tested. A direct comparison (Balanced block) was performed: Midgut tissues collected on day 20 (post infestation) from R. microplus was compared to that of R. decoloratus. Biological replicates: 3 ; Technical replicates: 1.
Project description:Transcriptional profiling of salivary gland, midgut and ovary tissues isolated from Rhipicephalus microplus females at day 20 post infestation. This enabled the identification of transcripts that are tissue-specific or shared among the tissues tested.
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. In the study presented here, 12 hybridizations were performed. Expression profiles for 13601 unique ESTs were analyzed. Uninfected ticks were collected in one batch, as were the infected ticks. Replicates performed are technical.
