Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Gene expression profiling of the early cadmium response includes abiotic stress signaling pathway in rice

ABSTRACT: Plant growth is severely affected by toxic concentrations of the non-essential heavy metal cadmium (Cd). Comprehensive transcriptome analysis by RNA-Seq following cadmium exposure is required to further understand plant responses to Cd and facilitate future systems-based analyses of the underlying regulatory networks. In this study, rice plants were hydroponically treated with 50 ÂµM Cd for 24 hours. In total, ~60,000 transcripts, including transcripts that could not be characterized by microarray-based approaches, were evaluated and ~36,000 transcripts were responsive to Cd exposure. Among multigenic families that may protect cells from generated ROS and reduce Cd toxicity, prominently upregulated antioxidant enzyme genes were identified. Furthermore, 168 different metal ion transporter genes, which might mediate the transport of transition Cd, responded to Cd exposure. qRT-PCR analysis of randomly selected genes indicated that their expression changed obviously after exposure to various heavy metal stresses. The Cd responsive genes included many abiotic stress (drought, high-salinity, low temperature) responsive genes. Based on further investigation into the expression patterns of abiotic stress regulatory genes such as DREB, part of the signal transduction pathway for Cd exposure was determined to cross-talk with abiotic stress signaling pathways. Our results provide useful information for further studies of the molecular mechanisms of plant adaptation to Cd exposure and the improvement of Cd tolerance in crop species.

INSTRUMENT(S): Illumina Genome Analyzer IIx

ORGANISM(S): Oryza sativa Japonica Group

SUBMITTER: Youko Oono

PROVIDER: E-MTAB-4306 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Genome-wide transcriptome analysis reveals that cadmium stress signaling controls the expression of genes in drought stress signal pathways in rice.

Oono Youko Y Yazawa Takayuki T Kawahara Yoshihiro Y Kanamori Hiroyuki H Kobayashi Fuminori F Sasaki Harumi H Mori Satomi S Wu Jianzhong J Handa Hirokazu H Itoh Takeshi T Matsumoto Takashi T

PloS one 20140509 5

Plant growth is severely affected by toxic concentrations of the non-essential heavy metal cadmium (Cd). Comprehensive transcriptome analysis by RNA-Seq following cadmium exposure is required to further understand plant responses to Cd and facilitate future systems-based analyses of the underlying regulatory networks. In this study, rice plants were hydroponically treated with 50 µM Cd for 24 hours and ∼60,000 expressed transcripts, including transcripts that could not be characterized by microa ...[more]

PMID: 24816929

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Project description:Field-selected tolerance to heavy metals has been reported for Orchesella cincta (Arthropoda: Collembola) populations occurring at metal-contaminated mining sites. This tolerance is correlated with heritable increase of metal excretion efficiency; less pronounce cadmium induced growth reduction and, over-expression of the metallothionein gene. We applied transcriptomics to determine differential gene expression caused by this abiotic stress in reference and cadmium tolerant populations. Many cDNAs responded to cadmium exposure in a reference population. Significantly fewer clones were cadmium responsive in tolerant animals. Analysis of variance revealed transcripts that interact between cadmium exposure and population. Hierarchical clustering of these clones revealed two major groups. The first one contained cDNAs that were up regulated by cadmium in the reference culture, but non-responsive or down regulated in tolerant animals. This cluster was also characterized by elevated constitutive expression in the tolerant population. Gene ontology analysis revealed that these cDNAs were involved in structural integrity of the cuticle, anti-microbial defense, calcium-channel blocking, neurotransmitter transport, chromatin remodeling and, endoplasmatic vesicle activity. The second group consisted of cDNAs down regulated in reference animals but not responding or slightly up regulated in tolerant animals. Their functions involved carbohydrate metabolic processes, Ca2+ dependent stress signaling, proteolysis and digestion. The reference population showed a strong signature of stress-induced genome-wide perturbation of gene expression, whereas the tolerant animals maintained normal gene expression upon cadmium exposure. We confirmed the micro-evolutionary processes occurring in soil arthropod populations and suggest a major contribution of gene regulation to the evolution of a stress-adapted phenotype. Orchesella cincta (Collembola) from the laboratory population (LC) at the department of Animal Ecology, Vrije Universiteit Amsterdam were taken as the reference group. This population originated from a pine forest from the reference area (Roggebotzand, the Netherlands, latitude N = 52 º 34’17’’, longitude E = 5 º 47’56’’) that contains on average < 0.5 μg cadmium per gram litter and humus. Tolerant animals were collected from randomly selected litter samples at two areas of the abandoned, but still heavily polluted lead/zinc mining site of Plombières (Belgium, latitude N = 50˚44’03’’, longitude E = 5˚58’02’’): the locations contain an average cadmium concentration between 10 and 52 μg.g-1 soil (Lock et al. 2003; Sterenborg 2003; Van Straalen et al. 1987). To diminish putative environmental effects from the field the animals were reared in a climate room (20°C, 75% humidity, LD 12 h:12 h) in PVC jars on a moist plaster of Paris layer feeding on algae present on twigs for at least three generations before experimental treatment. Animals were exposed to cadmium (nominal concentration of 112,4 μg cadmium.g-1 dry algae) for 3 days, directly after molting, via algal food. Control groups received the same treatment except that water was spiked into the algal food instead of cadmium solution. The cadmium exposure concentration is two times the no observed effect concentration (NOEC) for reproduction in chronically exposed animals. Total RNA was extracted from times 12 pooled animals per treatment using SV Total RNA Isolation system (Promega) and quantified on a Nanodrop ND-1000 Spectrophotometer (Nanodrop Technologies). Total RNA was visualized on a 1.5% agarose gel to verify its integrity. Each experimental group (pool of 12 animals) was replicated 8 times. Dyes were swapped between biological replicates: 4 Cy-3 labeled replicates and 4 Cy-5 lebeled replicates per experimental group Microarray experiment was designed in a closed loop Lab culture clean vs Cd, Lab culture Cd vs Tolerant culture Cd, Tolerant culture Cd vs Tolerant culture clean, Tolerant culture clean vs lab culture clean

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Dataset Information

Gene expression profiling of the early cadmium response includes abiotic stress signaling pathway in rice

Publications

Genome-wide transcriptome analysis reveals that cadmium stress signaling controls the expression of genes in drought stress signal pathways in rice.

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