Image defocus and altered retinal gene expression in chicks
Ontology highlight
ABSTRACT:
ORGANISM(S): Gallus gallus
SUBMITTER: Alice McGlinn
PROVIDER: E-GEOD-24641 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:Because refractive development is governed largely by the retina, we analyzed the retinal transcriptome in chicks wearing a spectacle lens, a well-established means to induce refractive errors, to identify gene expression alterations and to develop novel mechanistic hypotheses about refractive development.
2011-08-11 | GSE24641 | GEO
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. Experiment Overall Design: Four samples each: Retina of both eyes of +6.9 diopter lens-treated chicks (plus_lens), Retina of both eyes of untreated control chicks (control)
2008-11-04 | E-GEOD-11439 | biostudies-arrayexpress
Project description:Ocular growth is regulated locally by signals produced in the retina that ultimately act on the growth of the scleral tissue. Consequently, a number of studies have investigated changes in retinal gene expression during manipulation of ocular growth in an attempt to elucidate the biochemical pathways underlying eye growth. However, due to the highly heterogenous nature of the retina, important changes in gene expression can be masked. Therefore, this study has investigated changes in gene expression specifically within the retinal amacrine cell layer, the most likely generator of growth signals, during manipulations of ocular growth. Chicks were monocularly treated with either -7D (n=3, growth stimulant) or +7D (n=3, growth suppressant) lenses for 24hrs, with untreated age-matched chicks serving as a control (n=3). Total RNA from the amacrine cell layer was isolated from laser-capture microdissected (Zeiss, Bernried, Germany) 10µm thick sections. Labeled cRNA was prepared from three separate samples per condition and hybridized to Affymetrix GeneChip Chicken Genome arrays.
2010-07-08 | E-GEOD-17758 | biostudies-arrayexpress
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
2008-08-22 | GSE11439 | GEO
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 Eight experimental groups with 4 replicates each were analyzed. A reference RNA design was used for this microarray. Equal amounts of amplified RNA (aRNA) from all samples were pooled and labelled with the Alexa 647 to create the reference pool. Each individual sample was labelled with Alexa 555. Each slide was hybridized with both the reference pool and one sample.
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Project description:One-day old white Leghorn chicks were housed in brooders with a 12 hr light:dark cycle, using General Electric chroma 50 fluorescent lighting with irradiance of approximately 50μW/cm2 at chick eye level. They received Purina Chick Chow food and water ad libitum. At one week of age and at the onset of the light phase, the chicks were anesthetized with inhalation ether, and a unilateral translucent white plastic goggle was glued to the periorbital feathers to induce ipsilateral form-deprivation myopia, alternating between the left or right eye. After either 6 hrs (n=8) or 3 days (n=8) of goggle wear, the chicks were killed by decapitation. The enucleated eyes were opened at the equator, and the retina/RPE was dissected together from both the goggled and control eyes. The tissues were individually frozen and stored in liquid nitrogen until processed Experiment Overall Design: Six biological replicates used for each: 3 day control retina, 3 day experimental, 6 hour control retina, and 6 hour experimental.
2008-11-08 | E-GEOD-6543 | biostudies-arrayexpress
Project description:Delayed access to feed following hatching has been associated with reduction in growth performance in chicks. However, the gene networks within the hypothalamus that regulate feed intake and metabolism, and the effects of fasting on those pathways are not well understood. The present experiment evaluated global hypothalamic gene expression in neonatal chicks using the Arizona Gallus gallus 20.7K Oligo Array v1.0 to elucidate genes and pathways regulated by feeding, fasting, and refeeding. Ten groups of chicks were sampled over four days post-hatch, including: control (at hatch), 24h fed, 24h fasted, 48h fed, 48h fasted, 48h fasted then 4h refed, 72h fed, 48h fasted then 24h refed, 96h fed, and 48h fasted then 48h refed. Non-esterified fatty acids were elevated, and triglycerides were decreased in fasted chicks at 24 and 48h, indicating that fasting induced physiological changes. Hypothalamic samples were collected from 16 chicks per group, and total RNA was extracted and pooled for hybridization (n=4). Expression patterns of selected genes were confirmed by quantitative real-time PCR. Two-fold differences in gene expression were detected in 1,272 genes between treatment groups, and of those, 119 genes were significantly (P<0.05) different. Assignment of gene ontology terms to the significant genes resulted in 34 different categories of biological processes, with 24% of genes participating in signal transduction, transport, or metabolic processes. Genes that were upregulated during fasting (and confirmed by qPCR) include FK506BP51, which is involved in the formation of steroid receptor complexes, and deiodinase type II, which is responsible for converting the thyroid hormone T4 into T3. Confirmed genes, downregulated due to fasting, included proopiomelanocortin and fatty acid binding protein 7. Other regulated genes were identified that play a role in feeding and obesity in other species, such as relaxin 3 and adrenergic receptor-β2. Further analysis of differentially regulated genes could provide new information regarding the role of the hypothalamus in feed intake and metabolism. Keywords: Metabolic perturbation Ten experimental groups with 4 replicates each were analyzed. A reference RNA design was used for this microarray. Equal amounts of amplified RNA (aRNA) from all samples were pooled and labeled with the Alexa 647 to create the reference pool. Each individual sample was labeled with Alexa 555. Each slide was hybridized with both the reference pool and one sample.
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Project description:Avian coccidiosis is a major disease of poultry caused by the intestinal protozoa Eimeria. Aviagen line A and line B birds show differential susceptibility to Eimeria infection, with line B birds exhibiting higher lesion scores and mortality. The objective of this study was to examine differential intestinal gene expression between line A and B chicks in response to a challenge with Eimeria maxima. Following challenge with 1 x 10^4 oocysts/chick, greater than 40% of line A chicks had lesion scores of 0 to 1 (on 0 to 4 scale), similar to controls. In contrast, all line B challenged chicks at this same dose had lesion scores of 2 to 4. Total RNA was extracted from the jejunum of control and challenged chicks from both lines A and B. Microarrays were used for detecting the expression-changed genes which responsed to the Eimeria challenge. Samples included: four control A chicks, two challenged A chicks with a lesion score of 1 (A/LS1), two challenged A chicks with lesion scores of 3 to 4 (A/LS3-4), four control B chicks, two challenged B chicks with lesion scores of 2 (B/LS2-3) and two challenged B chicks with lesion scores of 4 (B/LS4). The DNA microarrays were processed at the Virginia Bioinformatics Institute (Virginia Tech) core facility. The raw array data were normalized using GC-robust multiple array (GC-RMA) normalization. Analysis of variance was used for differentially expressed genes based on Welch ANOVA (P < 0.05) and probe set lists were ordered using the fold change analysis provided by GeneSpring software.
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Project description:During an ENU (N-ethyl-N-nitrosourea) mutagenesis screen, we observed a dominant small-eye mutant mouse with viable homozygotes. A corresponding mutant line was established and referred to as Aey69 (abnormality of the eye #69). Comprehensive phenotyping of the homozygous Aey69 mutants in the German Mouse Clinic revealed only a subset of statistically significant alterations between wild types and homozygous mutants. The mutation causes microphthalmia without a lens but with retinal hyperproliferation. Linkage was demonstrated to mouse chromosome 3 between the markers D3Mit188 and D3Mit11. Sequencing revealed a 358A->C mutation (Ile120Leu) in the Hist2h3c1 gene and a 71T->C (Val24Ala) mutation in the Gja8 gene. Detailed analysis of eye development in the homozygous mutant mice documented a perturbed lens development starting from the lens vesicle stage including decreasing expression of crystallins as well as of lens-specific transcription factors like PITX3 and FOXE3. In contrast, we observed an early expression of retinal progenitor cells characterized by several markers including BRN3 (retinal ganglion cells) and OTX2 (cone photoreceptors). The changes in the retina at the early embryonic stages of E11.5-E15.5 happen in parallel with apoptotic processes in the lens at the respective stages. The excessive retinal hyperproliferation is characterized by an increased level of Ki67. The hyperproliferation, however, does not disrupt the differentiation and appearance of the principal retinal cell types at postnatal stages, even if the overgrowing retina covers finally the entire bulbus of the eye. Morpholino-mediated knock-down of the hist2h3ca1 gene in zebrafish leads to a specific perturbation of lens development. When injected into zebrafish zygotes, only the mutant mouse mRNA leads to severe malformations, ranging from cyclopia to severe microphthalmia. The wild-type Hist2h3c1 mRNA can rescue the morpholino-induced defects corroborating its specific function in lens development. Based upon these data, it is concluded that the ocular function of the Hist2h3c1 gene (encoding a canonical H3.2 variant) is conserved throughout evolution. Moreover, the data highlight also the importance of Hist2h3c1 in the coordinated formation of lens and retina during eye development.
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