Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Gold induction of C. metallidurans CH34

ABSTRACT: Whole-genome expression microarray experiments were conducted to assess the response of C. metallidurans CH34 to aqueous Au(III)-chloride and identify possible biochemical pathways for Au detoxification. Four microarray experiments were conducted to assess gold response at low, medium and high Au(III)-chloride concentrations (i.e., 10, 50 and 100 ÂµM Au(III)-chloride) and different induction times (10 and 30 minutes with 50 ÂµM Au(III)-chloride). Based on these arrays, the differentially expressed genes upon gold-exposure can be identified. The four microarray experiments (10, 50 and 100 ÂµM Au(III)-chloride at 10 minutes and 50 ÂµM Au(III)-chloride at 30 minutes) were all performed in biological triplicate and containing three (in-slide) technical repeats. For all conditions, the metal-induced sample (Cy5) was compared with the non-induced sample (Cy5) to identify those genes that were differentially expressed upon gold exposure.

ORGANISM(S): Ralstonia metallidurans CH34

SUBMITTER: Cornelia Grosse

PROVIDER: E-GEOD-14049 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Mechanisms of gold biomineralization in the bacterium Cupriavidus metallidurans.

Reith Frank F Etschmann Barbara B Grosse Cornelia C Moors Hugo H Benotmane Mohammed A MA Monsieurs Pieter P Grass Gregor G Doonan Christian C Vogt Stefan S Lai Barry B Martinez-Criado Gema G George Graham N GN Nies Dietrich H DH Mergeay Max M Pring Allan A Southam Gordon G Brugger Joël J

Proceedings of the National Academy of Sciences of the United States of America 20091007 42

While the role of microorganisms as main drivers of metal mobility and mineral formation under Earth surface conditions is now widely accepted, the formation of secondary gold (Au) is commonly attributed to abiotic processes. Here we report that the biomineralization of Au nanoparticles in the metallophillic bacterium Cupriavidus metallidurans CH34 is the result of Au-regulated gene expression leading to the energy-dependent reductive precipitation of toxic Au(III)-complexes. C. metallidurans, w ...[more]

PMID: 19815503

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Project description:Although immediate early genes (IEGs) such as Bdnf, Arc and Egr1, have been implicated in plasticity, the larger pathways related to memory and memory disorders are not well understood. Here, we combined statistical Affymetrix microarray and behavioral analyses to identify key genes and pathways associated with aging-related cognitive impairment. Aged rats were separated into cognitively unimpaired (AU) or impaired (AI) groups, based on their Morris water maze performance relative to young-adult (Y) animals. Hippocampal gene expression was assessed in Y, AU and AI on the fifth (last) day of maze training or 21 days posttraining, and in non-trained aged and young animals (eight groups, overall n = 78, one chip/animal). ANOVA, linear contrasts, and overrepresentation analyses identified genes and pathways that differed from Y generally with aging (in both AU and AI) or selectively with cognitive status (only in AI or AU). Plasticity pathways, including insulin/cAMP/IEG signaling, and glycogenolytic and lipogenic pathways, were selectively downregulated (5 days) in AI, whereas Notch2 (regulating oligodendrocyte differentiation) and myelination pathways were upregulated (particularly at 21 days). Downregulation with general aging occurred in signal transduction and axonal growth/transport pathways, whereas upegulation occurred in immune/inflammatory, lipid metabolism/transport (e.g., Lxr-Srebf1), and lysosomal pathways. In AU, receptor/signal transduction genes were selectively upregulated, suggesting possible compensatory mechanisms. Immunohistochemistry confirmed and extended results to the protein level. Thus, this study identified novel cognition-linked processes, suggesting a new model in which energy-intensive, plasticity/lipogenic processes and energy-generating pathways necessary for learning are coordinately downregulated during training, while myelinogenic programs that impair cognition are concurrently activated. Experiment Overall Design: Aged rats were separated into cognitively unimpaired (AU) or impaired (AI) groups, based on their Morris water maze performance relative to young-adult (Y) animals (NT, 5D, and 21D, N=10/group). Hippocampal gene expression was assessed in Y, AU and AI on the fifth (last) day of maze training or 21 days posttraining, and in non-trained aged and young animals (eight groups, overall n = 78, one chip/animal)

Dataset Information

Gold induction of C. metallidurans CH34

Publications

Mechanisms of gold biomineralization in the bacterium Cupriavidus metallidurans.

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