Rickettsia rickettsii transcriptome - Blood feeding response
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ABSTRACT:
ORGANISM(S): Rickettsia rickettsii
PROVIDER: GSE44315 | GEO | 2013/12/01
SECONDARY ACCESSION(S): PRJNA189711
REPOSITORIES: GEO
Similar Datasets
Project description:One of the most important vectors of the Brazilian Spotted Fever, the tick Amblyomma aureolatum in Brazil was used in this study. We laboratorial controlled the infection of adult females of A. aureolatum with the virulent brazilian strain Taiacu of Rickettsia rickettsii. The group of ticks was divided into 2 testing groups, group 2 (G2) composed of adult females incubated at 35°C for 3 days that were not fed after molting to adults and group 3 (G3) composed of adult females fed on its favorite natural host, the dog (Canis familiaris) also for 3 days. Right after incubation or feeding, ticks were individually dissected and all internal organs were transferred to RNAlater® Solution (Life Technologies) until gDNA and total RNA simultaneously isolation. A total of 14 ticks of each group were analyzed in two biological replicates (7 ticks each). Dye-swap was also applied to construct the technical replicate of each biological sample total RNA from both experimental samples (G2 and G3) was used for hybridization to dual channel arrays. Two biological replicates were used for each experimental group.
2013-12-01 | E-GEOD-44315 | biostudies-arrayexpress
Project description:One of the most important vectors of the Brazilian Spotted Fever, the tick Amblyomma aureolatum in Brazil was used in this study. We laboratorial controlled the infection of adult females of A. aureolatum with the virulent brazilian strain Taiacu of Rickettsia rickettsii. The group of ticks was divided into 2 testing groups, group 1 (G1) composed of adult females incubated at 25°C for 3 days and group 2 (G2) composed of adult females incubated at 35°C for 3 days. Right after incubation of both groups, ticks were individually dissected and all internal organs were transferred to RNAlater® Solution (Life Technologies) until gDNA and total RNA simultaneously isolation. A total of 14 ticks of each group were analyzed in two biological replicates (7 ticks each). Dye-swap was also applied to construct the technical replicate of each biological sample
2013-12-01 | GSE44316 | GEO
Project description:One of the most important vectors of the Brazilian Spotted Fever, the tick Amblyomma aureolatum in Brazil was used in this study. We laboratorial controlled the infection of adult females of A. aureolatum with the virulent brazilian strain Taiacu of Rickettsia rickettsii. The group of ticks was divided into 2 testing groups, group 1 (G1) composed of adult females incubated at 25°C for 3 days and group 2 (G2) composed of adult females incubated at 35°C for 3 days. Right after incubation of both groups, ticks were individually dissected and all internal organs were transferred to RNAlater® Solution (Life Technologies) until gDNA and total RNA simultaneously isolation. A total of 14 ticks of each group were analyzed in two biological replicates (7 ticks each). Dye-swap was also applied to construct the technical replicate of each biological sample total RNA from both experimental samples (G1 and G2) was used for hybridization to dual channel arrays. Two biological replicates were used for each experimental group.
2013-12-01 | E-GEOD-44316 | biostudies-arrayexpress
Project description:A collection of 1145 clones from an EST project on female tick salivary gland genes was hybridized on glass slides to RNA extracted from several feeding stages of adult female tick salivary glands, including unfed and replete, and from adult male ticks, either unfed or fed in the presence or absence of female ticks. In the female ticks, the early fed (<50 mg) and partially fed (30-200 mg) groups were very similar. The fast feeding (350-500 mg) and replete ticks were similar to each other, but different from the partially fed. The unfed ticks were more similar to the fast feeding – replete groups than the early fed-partially fed groups. In the males, there were differences between the males fed in the presence or absence of females, but overall, these groups were very similar. The unfed ticks were significantly different from the fed ticks. Males showed clear differences with females in expression, as well. The unfed females had high levels of genes involved in protein synthesis, while genes possibly involved in survival on the host, such as anticoagulants, seemed to be most expressed in the early and partially fed states. By contrast, in the males, the protein synthesis genes were expressed more in all three groups, while the putative secreted genes for survival were expressed less. Keywords: time course, effect of feeding, sex, effect of presence of females
2006-06-08 | GSE5010 | GEO
Project description:A collection of 1145 clones from an EST project on female tick salivary gland genes was hybridized on glass slides to RNA extracted from several feeding stages of adult female tick salivary glands, including unfed and replete, and from adult male ticks, either unfed or fed in the presence or absence of female ticks. In the female ticks, the early fed (<50 mg) and partially fed (30-200 mg) groups were very similar. The fast feeding (350-500 mg) and replete ticks were similar to each other, but different from the partially fed. The unfed ticks were more similar to the fast feeding â replete groups than the early fed-partially fed groups. In the males, there were differences between the males fed in the presence or absence of females, but overall, these groups were very similar. The unfed ticks were significantly different from the fed ticks. Males showed clear differences with females in expression, as well. The unfed females had high levels of genes involved in protein synthesis, while genes possibly involved in survival on the host, such as anticoagulants, seemed to be most expressed in the early and partially fed states. By contrast, in the males, the protein synthesis genes were expressed more in all three groups, while the putative secreted genes for survival were expressed less. Keywords: time course, effect of feeding, sex, effect of presence of females All samples were compared to the partially fed females. Females consisted of five groups: unfed, early fed, partially fed, fast feeding and replete. Four or five biological replicates were done of each, with the dyes used in both possible ways. In the males, three groups were used: unfed, feeding in the presence of females, and feeding in the absence of females. Two biological replicates were done of the feeding males, and one of extracts was hybridized twice for the males fed in the presence of females. Unfed males used one RNA sample, extracted from a large pool of ticks.
2010-06-11 | E-GEOD-5010 | biostudies-arrayexpress
Project description:Ticks are obligate blood feeding ectoparasites that transmit a wide variety of pathogenic microorganisms to their vertebrate hosts. Amblyomma sculptum is vector of Rickettsia rickettsii, the causative agent of Rocky Mountain spotted fever, the most lethal rickettsiosis that affects humans. It is known that the transmission of pathogens by ticks is mainly associated with the physiology of the feeding process. Pathogens that are acquired with the blood meal must first colonize the tick gut and later the salivary glands in order to be transmitted during a subsequent blood feeding via saliva. Tick saliva contains a complex mixture of bioactive molecules with anticlotting, antiplatelet aggregation, vasodilatory, anti-inflammatory, and immunomodulatory properties to counteract both the hemostasis and defense mechanisms of the host. Besides facilitating tick feeding, the properties of saliva may also benefits survival and establishment of pathogens in the host. In the current study, we compared the sialotranscriptome of unfed A. sculptum ticks and those fed for 72 h on rabbits using next generation RNA sequencing (RNA-seq). The total of reads obtained were assembled in 9,560 coding sequences (CDSs) distributed in different functional classes. CDSs encoding secreted proteins, including lipocalins, mucins, protease inhibitors, glycine-rich proteins, metalloproteases, 8.9 kDa superfamily members, and immunity-related proteins were mostly upregulated by blood feeding. Selected CDSs were analyzed by real-time quantitative polymerase chain reaction preceded by reverse transcription (RT-qPCR), corroborating the transcriptional profile obtained by RNA-seq. Finally, high-performance liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) analysis revealed 124 proteins in saliva of ticks fed for 96-120 h. The corresponding CDSs of 59 of these proteins were upregulated in salivary glands of fed ticks. To the best of our knowledge, this is the first report on the proteome of A. sculptum saliva. The functional characterization of the identified proteins might reveal potential targets to develop vaccines for tick control and/or blocking of R. rickettsii transmission as well as pharmacological bioproducts with antihemostatic, anti-inflammatory and antibacterial activities.
2018-10-23 | PXD007852 | Pride
Project description:Ticks are obligate blood feeding ectoparasites that transmit a wide variety of pathogenic organisms to their vertebrate hosts. The tick Amblyomma sculptum is vector of Rickettsia rickettsii, the causative agent of Rock Mountain spotted fever, the most lethal rickettsiosis that affects humans. It is known that the transmission of pathogens by ticks is mainly associated with the physiology of the feeding process. Pathogens that are acquired with the blood meal must first colonize the tick gut and later the salivary glands (SG). Then, to be transmitted during a subsequent blood feeding, pathogens must reach the saliva. Tick saliva contains a complex mixture of bioactive molecules with anti-clotting, anti-platelet aggregation, vasodilatory, anti-inflammatory, and immunomodulatory properties to counteract both the host hemostasis and defense mechanisms, which besides facilitating tick feeding, may also benefits survival and establishment of pathogens in the host. In the current study, we compared the sialotranscriptome of unfed A. sculptum ticks and fed for 72 hours on rabbits using RNA-seq. The total of reads obtained were mapped in 9,560 coding sequences (CDSs) distributed in six major functional classes. Genes encoding secreted proteins, including lipocalins, mucins, protease inhibitors, glycine rich, metalloprotease, and 8.9 kDa superfamily were mostly upregulated by blood feeding. Selected genes were analyzed by RT-qPCR and all of them presented the same transcriptional profile regulation observed in RNA-seq, corroborating the transcriptional findings of this study. Finally, we mapped 116 proteins secreted in tick saliva by mass spectrometry-based proteomic analysis. Identified proteins should be functionally characterized and might be potential targets to develop vaccines for tick control and/or blocking of R. rickettsii transmission as well as pharmacological bioproducts with anti-hemostatic, anti-inflammatory and anti-bacterial activities.
2021-03-07 | PXD006143 | Pride
Project description:Understanding the molecular basis of how the tick adapts to feed on different animal hosts is central to understanding tick and tick-borne disease (TBD) epidemiology. Tick adaptation to feed on vertebrate hosts is regulated by tick secretion of multiple tick saliva proteins (TSPs) and other molecules that regulate tick feeding. This study was initiated to determine if ticks such as Ixodes scapularis and Amblyomma americanum that are adapted to feed on multiple hosts utilized the same sets of proteins to accomplish feeding on all hosts. Our data suggest that ticks of the same species differentially express proteins when feeding on diffent hosts. SDS-PAGE and silver staining analysis revealed unique protein eletrophoretic profile in saliva of Ixodes scapularis and Amblyomma americanum that were stimulated to start feeding on different hosts: rabbits, humans, and dogs. LC-MS/MS sequencing and pairwise analysis of proteins in saliva of I. scapularis and A. americanum ticks that were non-stimulated and those that were stimulated to feed on rabbits, dogs, or humans identified TSPs that were unique to each treatment and those that were common. Overal, we identified a total of 276 and 340 non-redundant I. scapularis and A. americanum TSPs, which we have classified into 28 functional classes that include secreted conserved proteins (unknown functions), proteinase inhibitors, lipocalins, extracellular matrix/cell adhesion, heme/iron metabolism, signal transduction and immunity-related proteins being the most predominant in saliva of unfed ticks. With exception of Rhipicephalus microplus, anti-tick vaccine research relies on feeding lab animals. Data here suggest that lab animal data could result in prioritizing irrelevant targets as some tick genes are unique to ticks fed on lab animals. This study provides the platform that could be utilized to identify relevant target anti-tick vaccine antigens, and will facilitate early stage tick feeding research.
2022-02-28 | PXD007712 | Pride
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.
2013-03-15 | E-GEOD-35867 | biostudies-arrayexpress
Project description:The Ixodidea tick Dermacentor marginatus is a vector of many pathogens wide spread in Eurasia. Study of gene targets of the tick species provides insight to find novel tick protective antigen for drug development and vaccine targets. To obtain a broader picture of gene sequences and changes in expression level, we aimed to characterize the whole body transcriptome in D. marginatus adult female after engorgement and long-term starvation using RNA-seq. We have assembled and analyzed transcriptome of D. marginatus females 5 days after ecdysis, 24 h after a blood meal, and 6 months under controlled experimental conditions. Sequencing produced 30251 unigenes, of which 32% were annotated using Trinity. Gene expression was compared among groups differed by status as newly molted, starved and engorged female adult ticks. Nearly 1/3 of the unigenes in each group were differentially expressed compared to the other two group, and we found that the most numerous were proteins involved in catalytic and binding activities and apoptosis. Selected up-regulated differentially expressed genes in each group associated to protein, lipids, carbohydrate and chitin metabolism. Blood feeding and long-term starvation also caused genes differentially expressed in the defense response and antioxidant response. Finding the sequence information and expression pattern would be helpful in understanding molecular physiology of D. marginatus, and provides information for anti-tick vaccine and drug development.
2020-11-18 | GSE151667 | GEO