Project description:Temperature has fundamental influences on fitness and distribution of insects. There have been very few studies on effects of mild cold conditions on insects. We found Plutella xylostella had reduced fitness and females produced few viable eggs when reared at 10°C, a temperature at which they can complete development. Male moths reared at 10°C were not able to fertilize eggs, but the eggs produced by female moths reared at this temperature were viable and could be fertilisied by males moths reared at a warmer temperature (25°C). Subsequently, we examined the transcriptomic changes in mid-fourth instar female and male larvae reared at 10°C and 25°C to investigate sex-dependent developmental and physiological responses of P. xylostella to the mild cold stress. We found 624 differentially expressed genes (DEGs) in females, the majority of which were down-regulated. In males 3239 genes were dysregulated and the majority were up-regulated. Only 280 DEGs were common to both sexes. In females, no DEGs encoded heat shock or cold shock proteins, but some of the DEGs in males did encode these proteins. These differences might suggest that female and male adopt some different strategies in coping with cold stress and/or they were passively affected by coldness to different degrees and in different ways. In addition, DEGs encoding antimicrobial peptides, cytochrome P450 monooxygenases, fatty acid-related enzymes, cuticle proteins, myofilament, and hormone-related proteins were found in both sexes under cold stress. The transcriptome study reveals unexpected sex-dependent thermal responses and provides much new information of how insects that do not diapause cope with a decreased temperature
Project description:Whole-genome analysis of heat shock factor binding sites in Drosophila melanogaster. Heat shock factor IP DNA from non-shock (room temperature) Kc 167 cells compared to whole cell extract on Agilent 2x244k tiling arrays.
Project description:Cold exposure leads to alteration in the structure of the male sex chromosome of the mutant strain In(1)BM2(reinverted). Genome wide expression profiling was used to identify candidate genes involved in the expression of this phenotype. Adult male flies were exposed to cold shock at 12±1°C for 4 hours and the differentially expressed genes in the strain was compared to similarly exposed wild type Oregon R males. The microarray data was further validated using real time PCR. Two-condition experiment, RT vs. CS flies. Biological replicates: 2 control replicates, 2 replicates exposed to cold shock.
Project description:Cold exposure leads to alteration in the structure of the male sex chromosome of the mutant strain In(1)BM2(reinverted). Genome wide expression profiling was used to identify candidate genes involved in the expression of this phenotype. Adult male flies were exposed to cold shock at 12±1°C for 4 hours and the differentially expressed genes in the strain was compared to similarly exposed wild type Oregon R males. The microarray data was further validated using real time PCR.
Project description:Expression analysis of Heat Shock in Drosophila melanogaster KC167 Cells and 3rd instar dpcnbw larvae, and room temperature expression levels using Nimblegen arrrays (GPL8443) A 12 chip study using total RNA recovered from Heat shocked or non-heat shocked (room temperature) samples in either cells or larvae, 3 technical replicates for each treatment
Project description:Time series of eleven breast cancer samples subjected to different cold ischemic stress of up to 3 hr post tumor excision. A different 2x2 factorial within this study evaluated the effect of stabilization method (RNAlater vs snap freezing) and stablization delay (0 and 40 min) at room temperature.
