Transcription profiling of maize to identify gene expression changes after chilling for 4 hours (alarm phase)
ABSTRACT: This experiment evaluates quick (alarm) response to chilling in chilling-sensitive maize plants. Maize inbred line cm109 were grown in optimal conditions until third leaf was fully developed. At this stage plants were divided into three experimental variants: k0 - control plants, frozen at the beginning of daylight, k4 - control plants kept in the same conditions and frozen after 4 hours since beginning of daylight, c4 - plants kept in 14 deg. C for 4 hours since "dawn". At the mentioned moments, leaves were harvested and frozen in liquid nitrogen for RNA isolation.
Project description:Hypoxia results in the changes in expression of many genes, the majority of which are mediated via the transcriptional activity of the hypoxia inducible factor (HIF) complex. However, other mechanisms of gene regulation by hypoxia are likely and include control of mRNA stability, regulation of mRNA translation and regulation mediated by micrornas. The aim of this study is to identify microRNAs which expression is regulated by hypoxia. We chose the breast cancer line MCF7 for study as we had previously characterised the expression of the components of the HIF system in that cell line and undertaken an extensive study of the gene expression profile in response to hypoxia, a prolyl hydroxylase inhibitor dimethyloxalylglycine and HIF-1a isoform manipulations (Eldvidge. G.P. et al. (2006) JBC, vol. 281, 22, 15215-15226).
Project description:Mating is a complex process that causes many behavioral and physiological changes, but the factors triggering these changes and the underlying molecular processes are not well characterized. Honey bee queens provide a convenient system for dissecting these factors (e.g., physical manipulation, insemination volume, insemination substance) via instrumental insemination. We examined the effects of carbon dioxide (CO2), a commonly used anesthetic in instrumental insemination that causes changes similar to those observed after mating, and physical manipulation, which presumably mimics the act of copulation, on the brain transcriptional changes in honey bee queens. We found significant gene overlap between our study and previous mating studies in honey bee queens and Drosophila. This suggests that molecular pathways regulating the mating process are conserved across different mating regimes of honey bees as well as across insect orders.
Project description:The aim of this study was to identify alarm (fast) and acclimation phase (delayed) changes in the gene expression pattern in leaves of maize (CM 109 genotype) subjected to moderate chilling for 28 hours.
Project description:Newly emerged adult workers (24 hours old) were infected with 50,000 Nosema apis spores in sucrose solution. Controls were fed sucrose. Workers were maintained in cages in an incubator and collected at 2 and 7 days post-infection. Fat body tissue was dissected (eviscerated abdomen) and whole genome expression in this tissue was compared across treatments and collection time points using microarrays.
Project description:To assess the credibility of our experimental data in E-TABM-327 we compared transcriptional profiiles of media shifted Aspergillus fumigatus cultures using RNA that was subjected to 1, 2 or no rounds of amplification. The protocol dependent changes in log ratios were assessed
Project description:Identification of the régulation pathways implied in adventitious root formation control in Arabidopsis etiolated seedlings. 2 mutants : a null allele and a weak allele of the ARGONAUTE gene. 4 repetitions in 2 pools for each sample.
Project description:Transformants either containing pCS1 (strain CCS1) or pNIM as control (strain CCS2) were induced by doxycycline (40 ﾵg/ml) for the indicated times (T0-T10, 0 to 10 min) in hypha-inducing medium (10 % serum, 37 ﾰC) under a stream of 93.8 % nitrogen, 6 % CO2 and 0.2 % oxygen. For each time point, cDNA of CCS1 and CCS2 were co-hybridised to microarrays and ratios of expression were calculated for each gene. Each gene is represented by duplicate spots on the DNA microarrays.
Project description:Transformants either containing pCS1 (strain CCS1) or pNIM as control (strain CCS2) were induced by doxycycline (40 ﾵg/ml) for the indicated times (T0-T10, 0 to 10 min) in aerated hypha-inducing medium (10 % serum, 37 ﾰC). For each time point, cDNA of CCS1 and CCS2 were co-hybridised to microarrays and ratios of expression were calculated for each gene. Each gene is represented by duplicate spots on the DNA microarrays.
Project description:Abstract: Testicular cancers in young adult men derive from an inborn precursor lesion, called carcinoma in situ (CIS) of the testis. CIS cells are believed to arise from primordial germ cells or gonocytes that fail to differentiate into the male germ cell lineage, and show a remarkable resemblance to embryonic stem cells (ESC). With this study we aimed at further elucidating the origin of CIS using microarray analysis of genome-wide gene expression. CIS cells only constitute a small fraction of the tissue and therefore, to reduce contaminating RNA from other cell types, we developed a fast (160 sec) staining procedure specific for CIS and fetal germ cells. Highly enriched cell populations were obtained by laser microdissectioning. The expression profiles of CIS cells were compared to microdissected fetal gonocytes, oogonia and cultured ESC with and without genomic amplifications. The cell type most similar to CIS was the gonocytes indicating malignant transformation at this stage. The enriched cell populations allowed us to find unique expression patterns for the developmentally very related cell types. Analyses of the similarities and differences among the cell types may help us understand when and how the malignant transformation to CIS occurs.