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Identification of genomic loci associated with Rhodococcus equi susceptibility in foals

ABSTRACT: aCGH performed to identify copy number variants in Quarter Horses and perform casec-control GWAS

ORGANISM(S): Equus caballus

PROVIDER: GSE57510 | GEO | 2014/05/10

SECONDARY ACCESSION(S): PRJNA246572

REPOSITORIES: GEO

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Identification of genomic loci associated with Rhodococcus equi susceptibility in foals

Project description:aCGH performed to identify copy number variants in Quarter Horses and perform casec-control GWAS Two-condition experiment, All samples were compared to a single Quarter Horse reference to identify copy number variants to be used in the CNV GWAS

2014-05-10 | E-GEOD-57510 | biostudies-arrayexpress

Identification of genomic loci associated with Rhodococcus equi susceptibility in foals.

Project description:Pneumonia caused by Rhodococcus equi is a common cause of disease and death in foals. Although agent and environmental factors contribute to the incidence of this disease, the genetic factors influencing the clinical outcomes of R. equi pneumonia are ill-defined. Here, we performed independent single nucleotide polymorphism (SNP)- and copy number variant (CNV)-based genome-wide association studies to identify genomic loci associated with R. equi pneumonia in foals. Foals at a large Quarter Horse breeding farm were categorized into 3 groups: 1) foals with R. equi pneumonia (clinical group [N = 43]); 2) foals with ultrasonographic evidence of pulmonary lesions that never developed clinical signs of pneumonia (subclinical group [N = 156]); and, 3) foals without clinical signs or ultrasonographic evidence of pneumonia (unaffected group [N = 49]). From each group, 24 foals were randomly selected and used for independent SNP- and CNV-based genome-wide association studies (GWAS). The SNP-based GWAS identified a region on chromosome 26 that had moderate evidence of association with R. equi pneumonia when comparing clinical and subclinical foals. A joint analysis including all study foals revealed a 3- to 4-fold increase in odds of disease for a homozygous SNP within the associated region when comparing the clinical group with either of the other 2 groups of foals or their combination. The region contains the transient receptor potential cation channel, subfamily M, member 2 (TRPM2) gene, which is involved in neutrophil function. No associations were identified in the CNV-based GWAS. Collectively, these data identify a region on chromosome 26 associated with R. equi pneumonia in foals, providing evidence that genetic factors may indeed contribute to this important disease of foals.

| S-EPMC4043894 | biostudies-literature

Genomic and epigenomic analysis of taurine and indicine cattle

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2012-10-22 | GSE41624 | GEO

Project description:Equine whole-genome sequencing in Quarter Horses

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Genome-wide detection by array CGH of copy number variations among diverse horse breeds

Project description:Investigating genome-wide characteristics of CNVs in 6 horses representing 6 distinct breeds by using the aCGH method and performed GO and KEGG analysis for the CNVs genes.This result is an important complement to the mapping of horse whole-genome CNVs and helpful to study plateau horses’ adaption to the plateau’s environment.

2014-02-26 | GSE52504 | GEO

Array-Comparative Genomic Hybridization Reveals Loss of SOCS6 is Associated with Poor Prognosis in Primary Lung Squamous Cell Carcinoma

Project description:Primary tumor recurrence occurs commonly after surgical resection of lung squamous cell carcinoma (SCC). The aim of this study was to identify genes involved in recurrence in lung squamous cell carcinoma patients. Array comparative genomic hybridization (aCGH) was performed on DNA extracted from tumour tissue from 62 patients with primary lung squamous cell carcinomas. aCGH data was analysed to identify genes affected by copy number alterations that may be involved in SCC recurrence. Candidate genes were then selected for technical validation based on differential copy number between recurrence and non-recurrence SCC tumour samples. Genes technically validated advanced to tests of biological replication by qPCR using an independent test set of 72 primary lung SCC tumour samples. 18q22.3 loss was identified by aCGH as significantly associated with recurrence (p=0.038). Although aCGH copy number loss associated with recurrence was found for seven genes within 18q22.3, only SOCS6 copy number loss was both technically replicated by qPCR and biologically validated in the test set.

2011-12-25 | GSE32058 | GEO

Array-based comparative genomic hybridisation analysis at 1Mb resolution of 44 pilocytic astrocytomas

Project description:Pilocytic astrocytomas (PAs), WHO Grade I, are one of the most frequently occurring childhood brain tumors. We have used microarray comparative genomic hybridization (aCGH) at 1Mb resolution to study copy number changes in a series of PAs (n=44). Keywords: Comparative Genomic Hybridization, aCGH

2008-04-28 | GSE11263 | GEO

Immunogenicity of an electron beam inactivated Rhodococcus equi vaccine in neonatal foals.

Project description:Rhodococcus equi is an important pathogen of foals that causes severe pneumonia. To date, there is no licensed vaccine effective against R. equi pneumonia of foals. The objectives of our study were to develop an electron beam (eBeam) inactivated vaccine against R. equi and evaluate its immunogenicity. A dose of eBeam irradiation that inactivated replication of R. equi while maintaining outer cell wall integrity was identified. Enteral administration of eBeam inactivated R. equi increased interferon-γ production by peripheral blood mononuclear cells in response to stimulation with virulent R. equi and generated naso-pharyngeal R. equi-specific IgA in newborn foals. Our results indicate that eBeam irradiated R. equi administered enterally produce cell-mediated and upper respiratory mucosal immune responses, in the face of passively transferred maternal antibodies, similar to those produced in response to enteral administration of live organisms (a strategy which previously has been documented to protect foals against intrabronchial infection with virulent R. equi). No evidence of adverse effects was noted among vaccinated foals.

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Array comparative genomic hybridization of canine diffuse large B-cell lymphoma (cDLBCL)

Project description:The aim of this work was to identify copy number variations (CNVs) by high-resolution array comparative genomic hybridization (aCGH) on 50 dogs with newly diagnosed DLBCL.

2019-05-01 | GSE113258 | GEO

TRPM2 SNP genotype previously associated with susceptibility to Rhodococcus equi pneumonia in Quarter Horse foals displays differential gene expression identified using RNA-Seq.

Project description:BackgroundRhodococcus equi (R. equi) is an intracellular bacterium that affects young foals and immuno-compromised individuals causing severe pneumonia. Currently, the genetic mechanisms that confer susceptibility and/or resistance to R. equi are not fully understood. Previously, using a SNP-based genome-wide association study, we identified a region on equine chromosome 26 associated with culture-confirmed clinical pneumonia. To better characterize this region and understand the function of the SNP located within TRPM2 that was associated with R. equi pneumonia, we performed RNA-Seq on 12 horses representing the 3 genotypic forms of this SNP.ResultsWe identified differentially expressed genes in the innate immune response pathway when comparing homozygous A allele horses with the AB and BB horses. Isoform analyses of the RNA-Seq data predicted the existence of multiple transcripts and provided evidence of differential expression at the TRPM2 locus. This finding is consistent with previously demonstrated work in human cell lines in which isoform-specific expression of TRPM2 was critical for cell viability.ConclusionsThis work demonstrates that SNPs in TRPM2 are associated with differences in gene expression, suggesting that modulation of expression of this innate immune gene contributes to susceptibility to R. equi pneumonia.

| S-EPMC5139010 | biostudies-literature

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