Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Expression profiling data from mid-log phase cultures of wild type Vibrio campbellii BAA-1116

ABSTRACT: Small RNA and regulatory RNA discovery has been based on (i) computational predictions mainly in intergenic regions, (ii) microarray experiments, (iii) shotgun cloning of cDNA libraries, (iv) classical cloning of abundant small RNAs after size fractionation in polyacrylamide gels and (v) copurification with proteins like Hfq, CsrA and RNA polymerase. In this study, we attempted to experimentally validate in silico small and regulatory RNA predictions for V. campbellii BAA-1116 using a microarray expression profiling strategy. Specifically, we investigated transcripts from mid-log phase cultures grown in nutrient rich media and examined their hybridization to tiled probes targeting annotated V. campbellii BAA-1116 intergenic regions. Keywords: small RNA discovery Five replicates of wild type V. campbellii BAA-1116 were grown to Mid-log phase, and total RNA was extracted from 1.0E+9 cells. Messenger RNA was isolated from the total RNA extracts treated with DNase, labeled with biotin, fragmented and hybridized to V. campbellii BAA-1116 whole genome microarray (520694F, Affymetrix).

ORGANISM(S): Vibrio harveyi ATCC BAA-1116

SUBMITTER: Baochuan Lin

PROVIDER: E-GEOD-20960 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Identification of non-coding RNAs in environmental vibrios.

Silveira Ana Cristina G ACG Robertson Kelly L KL Lin Baochuan B Wang Zheng Z Vora Gary J GJ Vasconcelos Ana Tereza R ATR Thompson Fabiano L FL

Microbiology (Reading, England) 20100506 Pt 8

The discovery of non-coding RNA (ncRNA) has been mainly limited to laboratory model systems and human pathogenic bacteria. In this study, we begin to explore the ncRNA diversity in four recently sequenced environmental Vibrio species (Vibrio alginolyticus 40B, Vibrio communis 1DA3, Vibrio mimicus VM573 and Vibrio campbellii BAA-1116) by performing in silico searches using Infernal and Rfam for the identification of putative ncRNA-encoding genes. This search method resulted in the identification ...[more]

PMID: 20447992

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Project description:In Saccharomyces cerevisiae, a single double-strand break (DSB) triggers extensive phosphorylation of histone H2A (known as gammaH2AX) over 50 kb on either side of the DSB. This modification is carried out by either of yeastM-^Rs checkpoint kinases, the ATM homolog, Tel1, or the ATR homolog, Mec1. In G1-arrested cells, where there is very little 5M-^R to 3M-^R processing of DSB ends, only Tel1 promotes this modification. We have recently described a second modification gammaH2B - the phosphorylation of the C terminal T129 locus of histone H2B which is also carried out by both Mec1 and Tel1 kinases. To understand in detail how gamma-H2AX and gamma-H2B spread along the chromosome from a DSB we have undertaken a high-density analysis of their occupancy where there is a DSB on three different chromosomes. gamma-H2AX and gamma-H2B modifications are similar, but there is a marked absence of gamma-H2B near telomeres. We find that there is reduced gamma-H2AX and gamma-H2B modification over strongly transcribed regions, even taking into account the reduced histone occupancy of these genes. When transcription of the galactose-regulated genes GAL1, GAL10, GAL7 are turned off by the addition of glucose, gamma-H2AX is restored within 5 min; when these genes are again induced, gamma-H2AX is rapidly lost. Regions more distal to the GAL genes have markedly reduced gamma-H2AX levels that rise rapidly when transcription is repressed, suggesting that transcription acts as a barrier to the propagation of gamma-H2AX away from the DSB. The restoration of gamma-H2AX in transcribed regions can be carried out by either Mec1 or Tel1, even 7 h after break induction, suggesting that Tel1 remains associated with damaged chromosomes for an extended time. In addition, we show that gamma-H2AX can be transferred in trans, to regions unlinked to the DSB that lie in close proximity the DSB. Specifically, if a DSB is generated 14 kb from CEN2, gamma-H2AX is transferred to regions around all the other centromeres, in keeping with observed close proximity of all centromere-adjacent chromosome arms. This transfer can be observed even in the absence of formaldehyde crosslinking of the samples.

Dataset Information

Expression profiling data from mid-log phase cultures of wild type Vibrio campbellii BAA-1116

Publications

Identification of non-coding RNAs in environmental vibrios.

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