Project description:Arabidopsis cmt3 mutant showed neither DNA hypomethylation nor transcriptional activation of silenced repeats by gamma rays, which was found in wild type (WT). We used microarrays to compare the global transcriptional changes between the WT and cmt3 after the irradiation of 200 Gy. Transcriptions of transposition-related genes seemed to be differently affected in the WT and cmt3 by gamma rays, depending on the epigenetic codes of the genome. However, genome-wide transcriptions of the WT and cmt3 couldn't be positively correlated with the different levels of DNA methylation after the irradiation of 200 Gy. Rosette leaves from more than 10 plants were pooled for total RNA extraction and hybridization on Affymetrix Arabidopsis ATH1 genechips. We performed two independent array experiments using totally different biological replicates of WT and cmt3 mutant plants with or without gamma irradiation.
Project description:Arabidopsis cmt3 mutant showed neither DNA hypomethylation nor transcriptional activation of silenced repeats by gamma rays, which was found in wild type (WT). We used microarrays to compare the global transcriptional changes between the WT and cmt3 after the irradiation of 200 Gy. Transcriptions of transposition-related genes seemed to be differently affected in the WT and cmt3 by gamma rays, depending on the epigenetic codes of the genome. However, genome-wide transcriptions of the WT and cmt3 couldn't be positively correlated with the different levels of DNA methylation after the irradiation of 200 Gy.
Project description:CAF-1 is involved in nucleosome assembly following DNA replication and nucleotide excision repair. In Arabidopsis thaliana, the 3 CAF-1 subunits p150, p60 and p48 are encoded by FAS1, FAS2 and, most likely, MSI1, respectively.fas mutants exhibited increased levels of DNA double-strand breaks, a G2 phase retardation, and elevated levels of mRNAs coding for proteins involved in homologous recombinational repair. The same genes that were transcriptionally up-regulated in the fas mutants were also found to have a higher steady state level of transcription in wild-type Arabidopsis plants exposed to gamma-irradiation. Experiment Overall Design: Total RNA prepared from 4-week-old seedlings (without the roots i.e. true leaves with cotyledon and hypocotyls) using an RNeasy Plant Mini Kit (Qiagen, Hilden, Germany). Four-week-old sterile seedlings of wild-type plants (ecotype Nossen) were irradiated with 100 Gy of gamma-rays at a dose rate of 300 Gy/h. Six and 12 hours after irradiation, samples were frozen in liquid nitrogen and immediately ground for total RNA isolation. After confirming its quality, extracted RNA was prepared for microarray analysis. An Arabidopsis 2 Oligo Microarray kit (Agilent Technology, CA, USA) was used in this study. After confirming its quality, extracted RNA was prepared for microarray analysis as described by the manufacturer (Agilent) using the suggested chemicals and reagents.
Project description:To analyze the genes of which their expressions are modulated by gamma irradiation, we performed the whole genome expression microarray profiling by comparing normal whole seedlings of Arabidopsis thaliana as control with those of gamma irradiated as test sample.
Project description:RNAseq experiments to identify gene expression changes following gamma irradiation Adult male Schistosoma mansoni (strain: NMRI) were subjected to 200 Gy of gamma irradiation and cultured in vitro for 48hr hours. After 48hr germ line tissues were removed and RNA was extracted from remaining somatic tissues. Samples were processed for RNAseq using Illumina procedures.