Transcription profiling of Ectocarpus siliculosis sporophytes treated with auxin
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ABSTRACT: The aim of the experiment is to identify Ectocarpus siliculosus (strain Ec32) genes which are up- or down-regulated by auxin. RNAs were extracted from sporophytes treated with auxin NAA 5.10-6M for 30min or 3h, and labelled either with Cy3 or Cy5. Biological triplicates were performed.
Project description:The aim of this experiment was to analyse the expression of two sets of genes identified as being putatively sporophyte-specific or gametophyte-specific by a suppressive subtraction hybridisation using cDNA from immature sporophytes and immature gametophytes of the Ectocarpus strain Esil32. The expression of these genes was analysed in the sporophyte and gametophyte generations of the life cycle (again using immature algae that had not yet produces zoidangia) and in the sporophyte generation of a mutant strain, immediate upright, that exhibits gametophyte-like characteristics during the sporophyte generation.
Project description:Mice were obtained from in house breeding of C57BL/6J and C57BL/6J-Chr 1A/Na breeding pairs (Jackson Laboratories, USA). To produce F1 hybrids, C57BL/6J females were mated with C57BL/6J-Chr 1A/Na males. The F1 hybrids were intercrossed, producing 82 F2 progeny (41 males and 41 females). Microarray analysis was performed on six pairs of affected and non-affected male animals from the F2 progeny selected on the basis of their motor activity levels (average daily levels of distance moved over a 3 days recording: 768±74 cm/hr (affected) versus 1765±175 cm/hr (non-affected)(p<0.0001).
Project description:Transcription profiling of fission yeast /yox1/ deletion and genome wide location analysis of Yox1p and Cdc10p transcription factors reveal a negative feedback interaction: /yox1 /is transcriptionally activated by MBF, and Yox1p in turn transcriptionally represses the MBF target genes (including /yox1 /itself).
Project description:Fission yeast cells belong to one of two specialized cell types, M or P. Specific environmental conditions trigger sexual differentiation, which leads to an internal program starting with pheromone signalling between M and P cells, followed by mating, meiosis and sporulation. The initial steps of this process are controlled by Ste11p, a master transcriptional regulator that activates the expression of cell type-specific genes (only expressed in either M or P cells) as well as genes expressed in both M and P cells. <br><br> Pheromone signalling is activated by Ste11p-dependent transcription, and in turn enhances some of this transcription in a positive feedback. To obtain a genome-wide view of Ste11p target genes, their cell-type specificity, and their dependence on pheromone, we used DNA microarrays along with different genetic and environmental manipulations of fission yeast cells.We directly compared the transcriptome of homothallic wild-type cells (h90 fus1) with that of ste11 delta mutants under conditions that induce sexual differentiation. To allow for indirect effects of the ste11 delta mutation, we took advantage of the fact that ectopic expression of ste11 can drive cells into sexual differentiation and therefore is expected to cause the expression of Ste11p targets. We thus defined Ste11p targets as those genes whose expression was significantly reduced in a ste11 delta mutant and significantly increased when ste11 is overexpressed in vegetative cells.<br> <br> This study looked at the effect of deletion or overexpression of ste11, and changes in gene expression after nitrogen starvation of h plus, h minus, h90fus1 and h90ste11 cells.
Project description:Cell cycle timecourse of fission yeast using both selective (elutriation) and whole-culture (temperature-sensitive mutant cdc25) synchronisation methods
Project description:Cell cycle timecourse of fission yeast using both selective (elutriation) and whole-culture (temperature-sensitive mutant cdc10) synchronisation methods