Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of Drosophila NRF-2alpha/GABPalpha homologue delg mutants versus control reveals reduced expression of multiple genes encoding mitochondrial proteins

ABSTRACT: Nuclear transcription factors drive mitochondrial mass by regulating the expression of genes encoding mitochondrial proteins. Among these factors, nuclear respiratory factor 2 (NRF-2/GABP) has been proposed to be critical for mitochondrial mass in mammalian cells, yet there is little genetic evidence to support this function in vivo. Here, we show that mutants of the Drosophila melanogaster NRF-2alpha/GABPalpha homologue Delg (CG6338) have reduced expression of multiple genes encoding mitochondrial proteins, leading to reduced mitochondrial mass. Experiment Overall Design: Six samples were analyzed in total: three biological replicates of the control (Df_plus) and three biological replicates of the mutant (Df_delg).

ORGANISM(S): Drosophila melanogaster

SUBMITTER: Claudia Baltzer

PROVIDER: E-GEOD-14058 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Nutrition controls mitochondrial biogenesis in the Drosophila adipose tissue through Delg and cyclin D/Cdk4.

Baltzer Claudia C Tiefenböck Stefanie K SK Marti Mark M Frei Christian C

PloS one 20090909 9

MITOCHONDRIA ARE CELLULAR ORGANELLES THAT PERFORM CRITICAL METABOLIC FUNCTIONS: they generate energy from nutrients but also provide metabolites for de novo synthesis of fatty acids and several amino acids. Thus mitochondrial mass and activity must be coordinated with nutrient availability, yet this remains poorly understood. Here, we demonstrate that Drosophila larvae grown in low yeast food have strong defects in mitochondrial abundance and respiration activity in the larval fat body. This cor ...[more]

PMID: 19742324

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Project description:Resistance of Saccharomyces cerevisiae to high furfural concentration is based on NADPH-dependent reduction by at least two oxireductases. Biofuels derived from lignocellulosic biomass hold promises for a sustainable fuel economy, but several problems hamper their economical feasibility. One important problem is the presence of toxic compounds in processed lignocellulosic hydrolysates with furfural as a key toxin. While Saccharomyces cerevisiae has some intrinsic ability to reduce furfural to the less toxic furfuryl alcohol, higher resistance is necessary for process conditions. By comparing an evolved, furfural resistant strain and its parent in micro-aerobic, glucose-limited chemostats at increasing furfural challenge, we elucidate key mechanism and the molecular basis of both natural and high-level furfural resistance. At lower furfural concentrations, NADH-dependent oxireductases are the main defence mechanism. At concentrations above 15 mM, however, [1-13C]-flux and global array-based transcript analysis demonstrated that the NADPH-generating flux through pentose-phosphate pathway increases and that NADPH-dependent oxireductases became the major resistance mechanism. The transcript analysis further revealed that iron transmembrane transport is up-regulated in response to furfural. While these responses occur in both strains, high-level resistance in the evolved strain was based on strong induction of ADH7, the uncharacterised ORF YKL071W and 4 further, likely NADPH-dependent oxireductases. By overexpressing the ADH7 gene and the ORF YKL071W, we inverse engineered significantly increased furfural resistance in the parent strain, thereby demonstrating these two enzymes to be key elements of the resistance phenotype. Experiment Overall Design: RNA levels were measured in glucose limited, micro-aerobic chemostat cultures with different concentrations of the growth inhibitor furfural. Two strains were compared: TMB3400-FT30-3 is a strain that has been evolutionary adapted to withstand high furfural concentrations. TMB3400 is its less resistant parent. Number of biological replicates: 2-3.

Dataset Information

Transcription profiling of Drosophila NRF-2alpha/GABPalpha homologue delg mutants versus control reveals reduced expression of multiple genes encoding mitochondrial proteins

Publications

Nutrition controls mitochondrial biogenesis in the Drosophila adipose tissue through Delg and cyclin D/Cdk4.

Similar Datasets

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