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Embryonic heat conditioning in chicks induces transgenerational heat/immunological resilience via methylation on regulatory elements

ABSTRACT: Embryonic heat conditioning in chicks induces transgenerational heat/immunological resilience via methylation on regulatory elements

PROVIDER: PRJNA775904 | ENA |

REPOSITORIES: ENA

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Embryonic heat conditioning in chicks induces transgenerational heat/immunological resilience via methylation on regulatory elements

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Project description:The retina plays an important regulatory role in ocular growth. To screen for new retinal candidate genes that could be involved in the inhibition of ocular growth, we used chick microarrays to analyze the changes in retinal mRNA expression after myopic defocus was imposed by positive lens-wear. Chicks were raised under a 12h-light/12h-dark cycle (light-onset: 8:00 am and light-offset: 8:00 pm) with unrestricted access to water and food. On the day prior to the experiment, velcro rings were glued to the feathers around the eye under diethylether anaesthesia. Four male white leghorn chicks, aged 9 days, wore +6.9D spectacle lenses over both eyes for 24 hours. Four untreated age-matched male chicks from the same batch served as controls. After decapitation of the chicks, the eyes were enucleated and the retina was prepared. The retinae from both eyes of each chick were pooled for RNA isolation. Keywords: gene expression comparison

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Project description:Salmonella remains an important enteric pathogen of poultry, primarily due to concerns regarding food-borne illness in humans consuming contaminated poultry products. Specific probiotic cultures are efficacious as a treatment for neonatal poultry to prevent enteric infections (competitive exclusion) due to the exquisite susceptibility of young chicks to pathogens in the hatchery and brooding environment. The objective of this experiment was to analyze transcriptional profiles in the ceca of neonatal chicks using the Arizona Gallus gallus 20.7K Oligo Array v1.0, following treatment with a probiotic culture derived from poultry with and without Salmonella enterica subsp. Enteritidis (SE) challenge. Chicks were obtained from a commercial hatchery, and challenged with SE upon arrival at the laboratory. One hour post-challenge, chicks were treated with a probiotic culture (FM-B11). Treatment groups included: Control (no challenge or treatment, vehicle only), SE (challenged only), B11 (treated only) and SE+B11 (challenged and treated). Samples were obtained at 12h and 24h post-treatment. We observed that administration of a Lactobacillus-based probiotic culture to chicks following challenge with SE reduced SE colonization of the cecae and resulted in differential expression of genes in the cecae. Among all four treatment groups, 309 genes were differentially expressed (p<0.05) at 12h, and 352 genes were differentially expressed (p<0.05) at 24h. Keywords: disease state analysis

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