Drosophila adults 0.5% O2 6hr
Ontology highlight
ABSTRACT:
ORGANISM(S): Drosophila melanogaster
PROVIDER: GSE3482 | GEO | 2005/10/21
SECONDARY ACCESSION(S): PRJNA93297
REPOSITORIES: GEO
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Project description:Identify genes with increased transcript abundance after low oxygen stress in Drosophila adults. There are 6 Oregon-R experiments comparing low oxygen exposed to normal oxygen. Samples 1-4 have hypoxic RNA labeled with cy5, and samples 5&6 are dye-swaps with the hypoxic RNA labeled with cy3. Samples 7&8 are Sb/Tm3 flies to control for background effects.
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Project description:To determine which genes affected by loss of KDM5 in adults were direct targets, we carried out KDM5 ChIP-seq analyses. To valide this data, we utilized a previously generated fly strain in which the sole source of KDM5 is from a transgene expressing an HA tagged form of KDM5 expressed under the control of its endogenous promoter. Comparing genome-wide gene expression and KDM5 binding analyses in Drosophila adults, we demonstrate the primary function of KDM5 in adults is to activate gene expression KDM5. To investigate the link between KDM5 and H3K4me3, we carried out anti-H3K4me3 ChIP-seq from wildtype adults . Genome-wide, KDM5 and H3K4me3 peaks showed a similar distribution, with both peaking at the transcription start site (TSS) showed a striking overlap with the presence of H3K4me3.
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Project description:In order to understand the chronic hypoxia (CH) effect upon the absence of dystrophin, Drosophila melanogaster wild type and the model for DMD (dmDys), in which all dystrophins expression was knocked out by iRNA, were exposed to high altitude hypoxia (hypobaric hypoxia) during a 16-day climbing period reaching the summit of Mount McKinley (6194 meters above sea level). Furthermore, dmDys and Drosophila wild type were exposed to normobaric hypoxia (hypoxic chamber) following the same oxygen levels observed during the climbing expedition and to normoxic conditions for comparison. Affymetrix GeneChip® profiling was performed for individual flies from each experimental group. CH-dmDys differentially expressed 1281 genes, whereas control group differentially expressed 57 genes. Eight heat shock protein genes detected in the CH-dmDys microarray study were down-regulated, instead of up-regulated as seen in wild type hypoxic flies. This result suggests a differential gene expression response to CH, which could affect muscle performance.These results suggest that dmDys is more sensitive to CH due to reduced muscle function and hypoxic stress response. In order to understand the chronic hypoxia (CH) effect upon the absence of dystrophin, Drosophila melanogaster wild type and the model for DMD (dmDys), in which all dystrophins expression was knocked out by iRNA, were exposed to high altitude hypoxia (hypobaric hypoxia) during a 16-day climbing period reaching the summit of Mount McKinley (6194 meters above sea level). Furthermore, dmDys and Drosophila wild type were exposed to normobaric hypoxia (hypoxic chamber) following the same oxygen levels observed during the climbing expedition and to normoxic conditions for comparison. Affymetrix GeneChip® profiling was performed for individual flies from each experimental group. CH-dmDys differentially expressed 1281 genes, whereas control group differentially expressed 57 genes. Eight heat shock protein genes detected in the CH-dmDys microarray study were down-regulated, instead of up-regulated as seen in wild type hypoxic flies. This result suggests a differential gene expression response to CH, which could affect muscle performance.These results suggest that dmDys is more sensitive to CH due to reduced muscle function and hypoxic stress response. Overall design: Adults wild type and dystrophic flies (3-5 days old) were exposed to hypobaric hypoxia for two weeks during the summer expedition to Mount McKinley, Alaska (6194 MASL). Another set of wild types and dystrophic flies were exposed to normobaric hypoxia according to the table I obtained during the climbing expedition. During the expedition, the flies were maintained in vials with regular molasses and covered by thermo isolation to avoid low temperature, keeping the temperature at 25C. The experiment performed in the laboratory also used vials with regular molasses and at 25C. Table I. Expedition log book for mount McKinley ascent. Information obtained during the ascent and summit of Mount McKinley, June 1st to June 16th of 2007. The oxygen pressure (PO2) was calculated from the barometric pressure. GNB means go and back from the mentioned point. DAY In order to understand the chronic hypoxia (CH) effect upon the absence of dystrophin, Drosophila melanogaster wild type and the model for DMD (dmDys), in which all dystrophins expression was knocked out by iRNA, were exposed to high altitude hypoxia (hypobaric hypoxia) during a 16-day climbing period reaching the summit of Mount McKinley (6194 meters above sea level). Furthermore, dmDys and Drosophila wild type were exposed to normobaric hypoxia (hypoxic chamber) following the same oxygen levels observed during the climbing expedition and to normoxic conditions for comparison. Affymetrix GeneChip® profiling was performed for individual flies from each experimental group. CH-dmDys differentially expressed 1281 genes, whereas control group differentially expressed 57 genes. Eight heat shock protein genes detected in the CH-dmDys microarray study were down-regulated, instead of up-regulated as seen in wild type hypoxic flies. This result suggests a differential gene expression response to CH, which could affect muscle performance.These results suggest that dmDys is more sensitive to CH due to reduced muscle function and hypoxic stress response. In order to understand the chronic hypoxia (CH) effect upon the absence of dystrophin, Drosophila melanogaster wild type and the model for DMD (dmDys), in which all dystrophins expression was knocked out by iRNA, were exposed to high altitude hypoxia (hypobaric hypoxia) during a 16-day climbing period reaching the summit of Mount McKinley (6194 meters above sea level). Furthermore, dmDys and Drosophila wild type were exposed to normobaric hypoxia (hypoxic chamber) following the same oxygen levels observed during the climbing expedition and to normoxic conditions for comparison. Affymetrix GeneChip® profiling was performed for individual flies from each experimental group. CH-dmDys differentially expressed 1281 genes, whereas control group differentially expressed 57 genes. Eight heat shock protein genes detected in the CH-dmDys microarray study were down-regulated, instead of up-regulated as seen in wild type hypoxic flies. This result suggests a differential gene expression response to CH, which could affect muscle performance.These results suggest that dmDys is more sensitive to CH due to reduced muscle function and hypoxic stress response. Overall design: Adults wild type and dystrophic flies (3-5 days old) were exposed to hypobaric hypoxia for two weeks during the summer expedition to Mount McKinley, Alaska (6194 MASL). Another set of wild types and dystrophic flies were exposed to normobaric hypoxia according to the table I obtained during the climbing expedition. During the expedition, the flies were maintained in vials with regular molasses and covered by thermo isolation to avoid low temperature, keeping the temperature at 25C. The experiment performed in the laboratory also used vials with regular molasses and at 25C. Table I. Expedition log book for mount McKinley ascent. Information obtained during the ascent and summit of Mount McKinley, June 1st to June 16th of 2007. The oxygen pressure (PO2) was calculated from the barometric pressure. GNB means go and back from the mentioned point. DAY LOCATION ALTITUDE m PO2 mmHg (%) 1 Base Camp 2200 123.6 (16.3%) 2 Base Camp 2200 123.6 (16.3%) 3 Base Camp 2200 123.6 (16.3%) 4 Ski Hill 2400 120.7 (15.9%) 5 Kahiltna Pass 2950 113.0 (14.9%) 6 Motorcycle Hill 3350 107.7 (14.2%) 7 Motorcycle Hill 3350 107.7 (14.2%) 8 GNB from Motorcycle 4150 (5 hours) 97.7 (12.9%) 9 Medical Camp 4350 95.3 (12.5%) 10 GNB from Medical Camp 4150 (5 hours) 97.7 (12.9%) 11 Medical Camp 4350 95.3 (12.5%) 12 GNB from Medical Camp 4900 89.0 (11.7%) 13 Medical Camp 4350 95.3 (12.5%) 14 High Camp 5250 85.1 (11.2%) 15 Summit 6194 (0.3 hours) 75.4 (9.9%) 16 High Camp 5250 85.1 (11.2%)
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Project description:Sex differences in gene expression throughout development are poorly understood, especially sex-specific expression of micro RNAs. However these patterns of gene expression could have important implications in our understanding of the underlying mechanics of sex differentiation and sexual conflict. We extract mRNA and miRNA from male and female Drosophila melanogaster from three developmental timepoints, third larval instar, pupae and adults, and examine gene expression using microarrays. We found a large number of sex-biased mRNA transcripts at each stage of development, whereas sex-biased miRNA expression was low in larvae and pupae and more prevalent in adults.
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2014-05-07 | GSE57320 | GEO
Project description:Sex differences in gene expression throughout development are poorly understood, especially sex-specific expression of micro RNAs. However these patterns of gene expression could have important implications in our understanding of the underlying mechanics of sex differentiation and sexual conflict. We extract mRNA and miRNA from male and female Drosophila melanogaster from three developmental timepoints, third larval instar, pupae and adults, and examine gene expression using microarrays. We found a large number of sex-biased mRNA transcripts at each stage of development, whereas sex-biased miRNA expression was low in larvae and pupae and more prevalent in adults. We isolated 2 biological replicates of each sex at each of the three developmental timepoints and extracted mRNA and miRNA from each sample, creating 12 samples of each type of RNA which were ran on GeneChip Drosophila Genome 2.0 Affymetrix microarrays to examine mRNA expression, and GeneChip miRNA 3.0 Affymetrix microarrays to examine miRNA expression.
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