Unknown,Transcriptomics,Genomics,Proteomics

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Transcriptional profiling of host gene expression in chicken embryo fibroblasts infected with Reticuloendotheliosis virus strain HA1101

ABSTRACT: Reticuloendotheliosis virus (REV), a member of the Gammaretrovirus genus in the Retroviridae family, causes an immunosuppressive, oncogenic and runting-stunting syndrome in multiple avian hosts. To better understand the host interactions at the transcriptional level, microarray data analysis was performed in chicken embryo fibroblast (CEF) cells at 1, 3, 5, and 7 days after infection with REV. This study identified numerous differentially expressed genes that were classified into several functional groups. Significant differences were mainly observed in the expression of genes involved in the immune response, especially during the later post-infection time points. These results revealed that differentially expressed genes play important roles in the pathogenicity of REV infection. Our study is the first to use microarray analysis to investigate REV, and these findings provide insights into the underlying mechanisms of the host antiviral response and the molecular basis of viral pathogenesis. Infection of Reticuloendotheliosis virus induced gene expression in chicken fibroblasts was measured at 1, 3, 5, and 7 days post-infection after exposure to a multiplicity of infection of 1. Both infection group and non-infection group experiments were performed for 3 independent replicates at each time point.

ORGANISM(S): Gallus gallus

SUBMITTER: Ji Miao

PROVIDER: E-GEOD-66320 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:The response of chicken to non-typhoidal Salmonella infection is becoming well characterised but the role of particular cell types in this response is still far from being understood. Therefore, in this study we characterised the response of chicken embryo fibroblasts (CEFs) to infection with two different S. Enteritidis strains by microarray analysis. The expression of chicken genes identified as significantly up- or down-regulated (≥3-fold) by microarray analysis was verified by real-time PCR followed by functional classification of the genes and prediction of interactions between the proteins using Gene Ontology and STRING Database. Finally the expression of the newly identified genes was tested in HD11 macrophages and in vivo in chickens. Altogether 19 genes were induced in CEFs after S. Enteritidis infection. Twelve of them were also induced in HD11 macrophages and thirteen in the caecum of orally infected chickens. The majority of these genes were assigned different functions in the immune response, however five of them (LOC101750351, K123, BU460569, MOBKL2C and G0S2) have not been associated with the response of chicken to Salmonella infection so far. K123 and G0S2 were the only 'non-immune' genes inducible by S. Enteritidis in fibroblasts, HD11 macrophages and in the caecum after oral infection. The function of K123 is unknown but G0S2 is involved in lipid metabolism and in β-oxidation of fatty acids in mitochondria. Increased levels of G0S2 might decrease the availability of fatty acids to mitochondria. In non-professional phagocytes such as CEFs, this may lead to the dysfunction of mitochondria, apoptosis of CEFs and release of intracellular Salmonella. In professional phagocytes, G0S2 might be involved in the control of mitochondrial respiration, resulting in a decrease of reactive oxygen species as respiration by-products and lower damage to tissue. In this study we were interested whether chicken embryo fibroblast (CEFs) respond to S. Enteritidis infection and to what extent their response differs from that of other cells and caecal tissue. To address this, we characterised the gene expression of CEFs after infection with two different wild-type S. Enteritidis strains of poultry origin - SE 147 and SE 11 - using Agilen custom 8×15K microarrays. In total, 13,681 probes were designed to characterise the expression of ~9,000 transcripts of Gallus gallus.

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Transcriptional profiling of host gene expression in chicken embryo fibroblasts infected with Reticuloendotheliosis virus strain HA1101

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