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Expression analysis of circadian light response in Drosophila recombinant inbred lines (RIL)

ABSTRACT: The aim of this study was to identify quantitative trait loci (QTL) associated with variation in circadian photosensitivity in Drosophila, by measuring the locomotor response to early night light pulse (Zt15). We used QTL mapping of recombinant inbred lines (RIL), which was followed by microarrays expression comparison of two RI lines which differed significantly in their light response (RIL 104 shows a strong long phase delay response while RIL 58 shows a weak light response). Each of the two strains was sampled after light pulse, and without a light pulse (control), totalling 8 samples: 2x lines (L) x treatments (T) x 2 replicates

ORGANISM(S): Drosophila melanogaster

SUBMITTER: Eran Tauber

PROVIDER: E-GEOD-77116 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Expression analysis of circadian light response in Drosophila recombinant inbred lines (RIL)

Project description:The aim of this study was to identify quantitative trait loci (QTL) associated with variation in circadian photosensitivity in Drosophila, by measuring the locomotor response to early night light pulse (Zt15). We used QTL mapping of recombinant inbred lines (RIL), which was followed by microarrays expression comparison of two RI lines which differed significantly in their light response (RIL 104 shows a strong long phase delay response while RIL 58 shows a weak light response).

2016-02-09 | GSE77116 | GEO

Expression analysis of circadian light response in Drosophila

Project description:Light is a strong environmental cue that resets the circadian clock rhythm. We have used Affymetrix microarrays to profile the Drosophila head transcriptome response following a brief light pulse during the early night. Comparison of control (un-pulsed) and experimental flies reveal large number of differentially expressed transcripts underlying the process of light entrainment of the clock. Wild type flies exposed to light pulse at ZT15 compared to control group (no pulse)

2014-07-23 | E-GEOD-39578 | biostudies-arrayexpress

Analysis of fluorophore-labeled human cytochrome b5

Project description:Cytochrome b5 (b5) is a small accessory protein involved in several reactions. The interaction of b5 with its partner proteins, e.g., cytochrome P450 enzymes, has received much attention and has been the subject of numerous studies. In order to obtain further insights into protein-protein interactions of b5, we modified it with a green fluorophore, Alexa 488, which has a maleimide linker. The labeling was applied to both WT (without Cys) and the T70C mutant. This study revealed labeled sites in WT b5 and confirmed the Cys-selective labeling in the T70C mutant.

2024-06-22 | PXD047758 | Pride

Transcription profiling of mouse SCN after 30-min light pulse

Project description:The transmission of information about the photic environment to the circadian clock involves a complex array of neurotransmitters, receptors, and second messenger systems. Using laser capture microscopy and microarray analysis, a population of genes rapidly induced by light in the suprachiasmatic nucleus is identified. Experiment Overall Design: Mice were exposed starting at 1 hour after lights off to a 30-minute light pulse. At the end of the light pulse, mice were euthanized and the brains extracted. Cells from the suprachiasmatic nucleus were extracted using laser capture microscopy and gene expression was quantified using Affymetrix microarrays. Genes showing a significant increase in expression following the light pulse as compared to a sham light pulse were identified.

2008-06-15 | E-GEOD-6904 | biostudies-arrayexpress

Gene expression profile analysis of Fat and Lean chickens

Project description:The aim of this study was to identify genes involved in the variation of the muscle glycogen content at death (estimated through the glycolytic potential, GP), a determining factor of meat quality in chicken. Gene expression profiles of Pectoralis major muscle were established using microarrays. We compared Fat and Lean chickens issued from two lines divergently selected for abdominal fatness and also differed for muscle GP. A total of 197 genes were differentially expressed between Fat and Lean pure chickens. Several of these genes were validated by qRT-PCR. For the genes with human orthologs, annotation analyses were performed and mainly revealed pathways involved carbohydrate, fatty-acid, and protein metabolism. The relationship between gene expression and meat quality has to now be validated by further e-QTL studies on the F2 population. 8 samples from Fat chickens were compared to 8 samples from Lean chickens, 4 of these were dye-swapped.

2010-06-24 | E-GEOD-17445 | biostudies-arrayexpress

Gene expression profile analysis of F2 cross between Fat and Lean chickens

Project description:The aim of this study was to identify genes involved in the variation of the muscle glycogen content at death (estimated through the glycolytic potential, GP), a determining factor in the meat quality of chicken. The gene expression profiles of the Pectoralis major muscle were established using microarrays. We compared animals showing extreme GP values, issued from a F2 cross between Fat and Lean lines. A total of 254 genes were differentially expressed between F2 birds with low or high GP. Several of these genes were validated by qRT-PCR. For the genes with human orthologs, annotation analyses were performed and mainly revealed pathways involved in carbohydrate, fatty-acid and protein metabolism. The relationship between gene expression and meat quality has to now be validated by further e-QTL studies on the F2 population. 8 high GP samples compared to 8 low GP samples, 4 of these were dye-swapped.

2010-06-24 | E-GEOD-17428 | biostudies-arrayexpress

Gene expression profiling in a Duroc/Landrace pig population differing in intramuscular fat content

Project description:The experiment aimed at studying gene expression differences in longissimus dorsi muscle from pigs from two groups: High versus low intramuscular fat (IMF). The animals were selected from a crossbred population of Landrace x Yorkshire/Landrace x Duroc animals, where we have previously found a highly significant QTL for IMF (Grindflek et al. 2001: "Detection of quantitative trait loci for meat quality in a commercial slaughter pig cross", Mammalian Genome 12(4): 299-304), and by microarray analysis we hoped to identify candidate genes for the QTL and/or pathways that are affected by the genes responsible for the QTL. Keywords: phenotype comparison Direct dye-swap design, with 14 animals in each group (high IMF and low IMF) on 14 separate arrays

2013-01-01 | E-GEOD-12927 | biostudies-arrayexpress

SCN lightpulse timecourse

Project description:The aim of the experiment was to identify genes in the mouse suprachiasmatic nucleus whose expression was altered by exposure to a light pulse of 400 lux at CT16 (subjective night). C57BL/6 male mice were entrained to a 12:12 LD cycle and given a 30 min 400 lux light pulse at CT16. Punches of SCN tissue were collected at 30 (LP30), 60 (LP60)and 120 (LP120) mins after the start of the light pulse and flash frozen on dry ice. Sham SCN punches (Sham) were collected from mice not exposed to light at CT16. Total RNA from individual tissue samples was extracted using RNeasy micro kit from Qiagen using the lipid tissue protocol according to manufacturer's recommendations. Individual samples were analyzed for quality using an Agilent Bioanalzyer and only samples with a RIN of 8 and above were used. Samples were quantified by Nanodrop and 300ug of total RNA was used to prepare probes for hybridisation to Affymetrix Mouse Exon arrays. Probe preparation and array hybridisation was carried out according to Affymetrix protocols. Each array represents an individual SCN tissue punch.<br><br>

2013-12-16 | E-MEXP-3933 | biostudies-arrayexpress

Quantitative trait loci mapping and transcriptome analysis reveal candidate genes regulating the response to ozone in Arabidopsis thaliana

Project description:The formation of Reactive oxygen species (ROS) has been detected in all cellular departments and even in apoplastic space of plants. As multifaceted molecule, ROS are known to accumulate in response to various stresses, and ROS burst accompanied with transcriptomic reprogramming leading to defense response or programmed cell death. Acute ozone exposure has been used as a noninvasive tool to study ROS burst induced defense response and cell death for a long time. Moreover the variation of ozone sensitivity in different Arabidopsis accessions highlights the flexibility of complex genetic architecture to adapt to specific stresses. In this study, we combine classic Quantitative Trait Loci (QTL) mapping and RNA-seq to identify the cause QTLs and potential gene candidates in response to ozone. RNA sequencing was performed on both control and ozone treated 3 weeks old accessions C24 (ozone tolerant), Te (ozone sensitive) and on a RIL line CT101 (a hypersensitive line of RIL population from reciprocal cross between C24 and Te), in triplicate. We identified 69 potential genes candidates inside the QTL regions and about 200 potential genes outside QTL region in response to ozone by comparing control to treatment within same genotype or comparing control between genotypes.

2014-09-19 | GSE61542 | GEO

affy_zeawall_ril_maize - Expression studies in 5 early maize RIL with contracted allelic patterns at major QTL posititions

Project description:affy_zeawall_ril_maize - Four major QTL explaining lignin content and cell wall degradability variation have been identified in the F288 x F271 RIL progeny (Roussel et al., 2002, Maydica 47: 9-20). Gene expression has been considered as a way in identification of candidate gene underlying QTL. Five lines chosen for their allelic pattern at four main QTL were considered for expression studies, two lines with all four favorable alleles (RIL99, RIL54), two lines with the unfavorable allele at bin 6.06 QTL position (RIL39 , RIL71), and one line with the unfavorable allele at bin 9.02 QTL position (RIL118). Expression study will be investigated in ear internode at two stages emerging tassel and early silking stages with two replicates. Plants were cropped at INRA Lusignan (Vienne, France) in 2009 in a bloc design with two four-row replicates. Below-ear internodes of five representative RIL plants of one row in each replicate were harvested at the two stages and pooled. Keywords: genotype comparison, time course

2012-06-17 | GSE22439 | GEO

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