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Anaplasma phagocytophilum infected NB4 cells

ABSTRACT: THREE INDEPENDENT REPLICATES AND ARE THE CONTROL NON-INFECTED CELLS: GSM49939, GSM49940, GSM49941 THREE INFECTED INDEPEDENDENT REPLICATES: GSM49942, GSM49943, GSM49944 Keywords: ordered

ORGANISM(S): Homo sapiens

PROVIDER: GSE2600 | GEO | 2005/07/29

SECONDARY ACCESSION(S): PRJNA92015

REPOSITORIES: GEO

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Transcription profiling of human the treatments A. phagocytophilum-infected vs uninfected NB4 cells to determine the global impact of A. phagocytophilum infection in NB4 cells

Project description:THREE INDEPENDENT REPLICATES ARE THE CONTROL NON-INFECTED CELLS: GSM49939, GSM49940, GSM49941; THREE INFECTED INDEPEDENDENT REPLICATES: GSM49942, GSM49943, GSM49944

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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

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Global DNA methylation changes and differential gene expression in Anaplasma phagocytophilum-infected human neutrophils

Project description:Background: Anaplasma phagocytophilum is an obligate intracellular prokaryotic pathogen that both infects and replicates within human neutrophils. The bacterium represses multiple antimicrobial functions while simultaneously increasing proinflammatory functions by reprogramming the neutrophil genome. Previous reports show that many observed phenotypic changes are in part explained by altered gene transcription. We recently identified that large chromosomal regions of the neutrophil genome are differentially expressed during A. phagocytophilum infection. Because of this, we sought to determine whether gene expression programs altered by infection were the result of changes in the host neutrophil DNA methylome. Results: Within 24 h of infection, marked increases in DNA methylation were observed genome-wide as compared with mock-infected controls and pharmacologic inhibition of DNA methyltransferases resulted in decreased bacterial growth. New regions of DNA methylation were enriched at intron and exon junctions; however, intragenic methylation did not correlate with altered gene expression. In contrast, intergenic DNA methylation was associated with A. phagocytophilum-induced gene expression changes. Within the major histocompatibility complex locus on chromosome 6, a region with marked changes in infection-induced differential gene expression, new regions of methylation were localized to boundaries of active and inactive chromatin. Conclusions: These data strongly suggest that A. phagocytophilum infection, in addition to altering histone structure, alters DNA methylation and the epigenome of its host cell to promote survival and replication, providing evidence that such bacterial infection can radically alter the epigenome of its host cell.

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