Comparison of Transcriptome Profiles of Human Ehrlichiosis Agents
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ABSTRACT:
ORGANISM(S): Ehrlichia chaffeensis str. West Paces Ehrlichia chaffeensis str. Osceola Ixodes scapularis Ehrlichia chaffeensis str. Heartland Ehrlichia chaffeensis str. Arkansas Ehrlichia chaffeensis str. Liberty Canis lupus familiaris Ehrlichia japonica Ehrlichia chaffeensis str. Saint Vincent Ehrlichia chaffeensis str. Wakulla Ehrlichia chaffeensis str. Jax
PROVIDER: GSE56339 | GEO | 2014/04/01
SECONDARY ACCESSION(S): PRJNA243269
REPOSITORIES: GEO
Similar Datasets
Project description:This study is to determine and compare the transcriptomes in two eukaryotic hosts (mammalian host - DH82 canine cell line and tick vector - ISE6 Ixodes scapularis cell line) of eight Ehrlichia chaffeensis strains in three divergent genetic groups, including Arkansas, Heartland, Jax, Liberty, Osceola, St. Vincent, Wakulla, and West Paces, and one Ehrlichia sp. HF strain. RNA samples for the Arkansas (reference), Heartland, Jax, Liberty, Osceola, St. Vincent, Wakulla, and West Paces strains in both tick and canine cell lines, including two uninfected controls, will be isolated in triplicate. As such 108 libraries will be constructed and sequenced corresponding to (8 strains + 1 control) x 2 conditions (tick cells + dog cells) x 3 biological triplicates x 2 molecules sequenced (eukaryotic RNA + prokaryotic RNA). The transcriptomes are obtained with Illumina HiSeq reads obtained from paired end libraries. The bacterial reads will be mapped against the reference genome and compared through a differential expression analysis. The eukaryotic reads from the same cell types (i.e. tick or canine) will be assembled with Trinity. The reads will then be mapped back to this assembly for the differential expression analysis.
2014-04-01 | E-GEOD-56339 | biostudies-arrayexpress
Project description:Background Human monocytotropic ehrlichiosis is an emerging life-threatening zoonosis caused by obligately intracellular bacterium, Ehrlichia chaffeensis. E. chaffeensis is transmitted by the lone star tick, Amblyomma americanum, and replicates in mononuclear phagocytes in mammalian hosts. Differences in the E. chaffeensis transcriptome in mammalian and arthropod hosts are unknown. Thus, we determined host-specific E. chaffeensis gene expression in human monocyte (THP-1) and in Amblyomma and Ixodes tick cell lines (AAE2 and ISE6) using a whole genome microarray. Methodology/Principal Findings The majority (~80%) of E. chaffeensis genes were expressed during infection in human and tick cells. There were few differences observed in E. chaffeensis gene expression between the vector Amblyomma and non-vector Ixodes tick cells, but extensive host-specific and differential gene expression profiles were detected between human and tick cells, including higher transcriptional activity in tick cells and identification of gene subsets that were differentially expressed in the two hosts. Differentially and host-specifically expressed ehrlichial genes encoded major immunoreactive tandem repeat proteins (TRP), the outer membrane protein (OMP-1) family, and hypothetical proteins that were 30–80 amino acids in length. Consistent with previous observations, high expression of p28 and OMP-1B genes was detected in human and tick cells, respectively. Notably, E. chaffeensis genes encoding TRP32 and TRP47 were highly upregulated in the human monocytes and expressed as proteins; however, although TRP transcripts were expressed in tick cells, the proteins were not detected in whole cell lysates demonstrating that TRP expression was post transcriptionally regulated. Conclusions/Significance Ehrlichia gene expression is highly active in tick cells, and differential gene expression among a wide variety of host-pathogen associated genes occurs. Furthermore, we demonstrate that genes associated with host-pathogen interactions are differentially expressed and regulated by post transcriptional mechanisms. A microarray (4-plex) study using E. chaffeensis cultivated in each cell line (THP-1, AAE2 and ISE6), three biological replicates/cell line. For each cell line, RNA was also extracted from uninfected cells (negative controls) and was processed similar to the infected cells; these samples were used for background subtraction during data analysis.
2011-09-06 | E-GEOD-29109 | biostudies-arrayexpress
Project description:Background Human monocytotropic ehrlichiosis is an emerging life-threatening zoonosis caused by obligately intracellular bacterium, Ehrlichia chaffeensis. E. chaffeensis is transmitted by the lone star tick, Amblyomma americanum, and replicates in mononuclear phagocytes in mammalian hosts. Differences in the E. chaffeensis transcriptome in mammalian and arthropod hosts are unknown. Thus, we determined host-specific E. chaffeensis gene expression in human monocyte (THP-1) and in Amblyomma and Ixodes tick cell lines (AAE2 and ISE6) using a whole genome microarray. Methodology/Principal Findings The majority (~80%) of E. chaffeensis genes were expressed during infection in human and tick cells. There were few differences observed in E. chaffeensis gene expression between the vector Amblyomma and non-vector Ixodes tick cells, but extensive host-specific and differential gene expression profiles were detected between human and tick cells, including higher transcriptional activity in tick cells and identification of gene subsets that were differentially expressed in the two hosts. Differentially and host-specifically expressed ehrlichial genes encoded major immunoreactive tandem repeat proteins (TRP), the outer membrane protein (OMP-1) family, and hypothetical proteins that were 30–80 amino acids in length. Consistent with previous observations, high expression of p28 and OMP-1B genes was detected in human and tick cells, respectively. Notably, E. chaffeensis genes encoding TRP32 and TRP47 were highly upregulated in the human monocytes and expressed as proteins; however, although TRP transcripts were expressed in tick cells, the proteins were not detected in whole cell lysates demonstrating that TRP expression was post transcriptionally regulated. Conclusions/Significance Ehrlichia gene expression is highly active in tick cells, and differential gene expression among a wide variety of host-pathogen associated genes occurs. Furthermore, we demonstrate that genes associated with host-pathogen interactions are differentially expressed and regulated by post transcriptional mechanisms.
2011-09-07 | GSE29109 | GEO
Project description:Ehrlichia chaffeensis is an obligatory intracellular organism, and causes human monocytic ehrlichiosis (HME), a tick-borne illness. Clinical signs of HME vary from asymptomatic infection to severe mobility that requires hospitalization or death. After whole genome sequencing of this bacterium, 425 open reading frames (38%) of 1115 in the genome were found as hypothetical gene with unknown function. A little is known about pathogenicity gene(s) and strain variation of this bacterium to date. Previously several E. chaffeensis strains were shown to be different based on comparison of limited gene sequences (p120, OMP-1[p28]s, and VLPT). To elucidate strain genetic variations and associated virulency, we carried out comparative genome hybridization (CGH) of E. chaffeensis Arkansas, Wakulla and Liberty strains, since these strains are most distinct in the previous studies. The tiling array containing approximately 300,000 probes of 29 nt spaced as dense as 8 bp on both strands of the genome of E. chaffeensis Arkansas was used. Keywords: Comparative genome hybridization
2007-11-06 | GSE6230 | GEO
Project description:A whole genome tiling microarray based on the published sequence of the Anaplasma phagocytophilum (Ap) strain Hz genome was used to measure transcriptional activity of Ap grown to late stage in three cell lines representing the diversity of host cells naturally infected by Ap: two human cell lines, HL-60 (promyelocytic leukocyte) and HMEC-1 (microvascular endothelial), and the tick (Ixodes scapularis) cell line ISE6. Keywords: cell type comparison
2008-08-04 | GSE11487 | GEO
Project description:Anaplasma phagocytophilum is an emerging zoonotic pathogen that causes human granulocytic anaplasmosis. These intracellular bacteria establish infection by affecting cell function in both the vertebrate host and the tick vector, Ixodes scapularis. Previous studies have characterized the tick transcriptome and proteome in response to A. phagocytophilum infection. However, in the post-genomic era, the integration of omics datasets through a systems biology approach allows network-based analyses to describe the complexity and functionality of biological systems such as host-pathogen interactions and the discovery of new targets for prevention and control of infectious diseases. This study reports for the first time a systems biology integration of metabolomics, transcriptomics and proteomics data to characterize essential metabolic pathways involved in the response of tick cells to A. phagocytophilum infection. The results showed that infection affected protein processing in endoplasmic reticulum and glucose metabolic pathways in tick cells. These results supported tick-Anaplasma co-evolution by providing new evidence of how tick cells limit pathogen infection, while the pathogen benefits from the tick cell response to establish infection. The results suggested that A. phagocytophilum induces protein misfolding to limit the tick cell response and facilitate infection, but requires protein degradation to prevent ER stress and cell apoptosis to survive in infected cells. Additionally, A. phagocytophilum may benefit from the tick cellâs ability to limit bacterial infection through PEPCK inhibition leading to decreased glucose metabolism, which also results in the inhibition of cell apoptosis that increases infection of tick cells. These results support the use of this experimental approach to systematically identify tick cell pathways and molecular mechanisms involved in tick-pathogen interactions Two samples with two replicates each were analyzed. Samples included Ixodes scapularis ISE6 cells uninfected (control) and infected with Anaplasma phagocytophilum human NY18 isolate.
2016-01-06 | E-GEOD-68881 | biostudies-arrayexpress
Project description:Ixodes species ticks are competent vectors of tick-borne viruses including tick-borne encephalitis and Powassan encephalitis. Tick saliva has been shown to facilitate and enhance viral infection. This likely occurs by saliva-mediated modulation of host responses into patterns favorable for viral infection and dissemination. Because of the rapid kinetics of tick-borne viral transmission, this modulation must occur as early as tick attachment and initiation of feeding. In this study, the gene expression profile of cutaneous bite-site lesions created by uninfected ticks were analyzed at 1, 3, 6, and 12 hours after Ixodes scapularis nymphal tick attachment to discover host pathways or responses potentially important in tick-borne viral establishment. Four milimeter ear biopsies from BALB/cJ mice infested with Ixodes scapularis nymphs were assayed using Affymetrix genechip 430A 2.0 arrays at 1, 3, 6, and 12 hours after infestation during a primary exposure. 3 mice were measured at each time point. Controls were 3 similarly housed but tick-free mice.
2012-12-21 | E-GEOD-39100 | biostudies-arrayexpress
Project description:We report differential gene expression with tissue-specific signatures in tick cell lines infected with Anaplasma phagocytophilum - transcriptional response to infection of I. scapularis ISE6 cells resembled that of tick hemocytes while the response in I. ricinus IRE/CTVM20 cells resembles that of tick midguts.
2017-01-01 | GSE76906 | GEO
Project description:An Ixodes scapularis saliva mRNA vaccine induces tick resistance and prevents Borrelia burgdorferi infection in guinea pigs
2021-09-13 | GSE184063 | GEO
Project description:Ixodes species ticks are competent vectors of tick-borne viruses including tick-borne encephalitis and Powassan encephalitis. Tick saliva has been shown to facilitate and enhance viral infection. This likely occurs by saliva-mediated modulation of host responses into patterns favorable for viral infection and dissemination. Because of the rapid kinetics of tick-borne viral transmission, this modulation must occur as early as tick attachment and initiation of feeding. In this study, the gene expression profile of cutaneous bite-site lesions created by uninfected ticks were analyzed at 1, 3, 6, and 12 hours after Ixodes scapularis nymphal tick attachment to discover host pathways or responses potentially important in tick-borne viral establishment.
2012-12-21 | GSE39100 | GEO