Laccases-Differential expression in laccase mutants of Arabidopsis thaliana
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ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE21388 | GEO | 2010/05/01
SECONDARY ACCESSION(S): PRJNA126055
REPOSITORIES: GEO
Similar Datasets
Project description:ra08-03_kim - laccases - Are laccases involved in lignification - all plants were harveted at the same developmental stage in the same growth chamber between 10h30 and 11h. Keywords: wt vs mutant comparison 8 dye-swap - CATMA arrays
2010-05-01 | E-GEOD-21388 | biostudies-arrayexpress
Project description:ra10-01_laccases; laccase mutations. We demonstrated that laccases are involved in lignin polymerisation. Mutants have already been tested on microarrays and there is few differences compared to wild-type. The laccase mutation seems surgical. We possess a new double mutant, called snips, with a semi-dwarf phenotype, and we want to determine its profile. Each mutant was compared to wild type. All plants were harvested at the same developmental stage in the same growth chamber between 10h30 and 11h. 10 dye-swaps. CATMA arrays.
2011-07-02 | E-GEOD-22907 | biostudies-arrayexpress
Project description:ra10-01_laccases; laccase mutations. We demonstrated that laccases are involved in lignin polymerisation. Mutants have already been tested on microarrays and there is few differences compared to wild-type. The laccase mutation seems surgical. We possess a new double mutant, called snips, with a semi-dwarf phenotype, and we want to determine its profile.
2011-07-02 | GSE22907 | GEO
Project description:Laccases were proposed to catalyze the oxidative polymerization of monolignols. We identified 49 laccase gene models in Populus trichocarpa, of which 29 were predicted to be targets of ptr-miR397a. We overexpressed Ptr-MIR397a in transgenic P. trichocarpa. In each of all 9 transgenic lines tested, 17 PtrLACs were down-regulated as analyzed by RNA-seq. Transgenic lines with severe reduction in the expression of these laccase genes resulted in an approximately 40% decrease in the total laccase activity. Overexpression of Ptr-MIR397a in these transgenic lines also reduced lignin content, whereas levels of all monolignol biosynthetic gene transcripts remained unchanged. A hierarchical genetic regulatory network (GRN) built by a bottom-up Graphic Gaussian Model algorithm provides additional support for a role of ptr-miR397a as a negative regulator of laccases for lignin biosynthesis. Full transcriptome based differential gene expression in the overexpressed transgenics and protein domain analyses implicate previously unidentified transcription factors and their targets in an extended hierarchical GRN including ptr-miR397a and laccases that coregulate lignin biosynthesis in wood formation. Ptr-miR397a, laccases and other regulatory components of this network may provide additional strategies for genetic manipulation of lignin content.
2014-01-17 | GSE54153 | GEO
Project description:Laccases were proposed to catalyze the oxidative polymerization of monolignols. We identified 49 laccase gene models in Populus trichocarpa, of which 29 were predicted to be targets of ptr-miR397a. We overexpressed Ptr-MIR397a in transgenic P. trichocarpa. In each of all 9 transgenic lines tested, 17 PtrLACs were down-regulated as analyzed by RNA-seq. Transgenic lines with severe reduction in the expression of these laccase genes resulted in an approximately 40% decrease in the total laccase activity. Overexpression of Ptr-MIR397a in these transgenic lines also reduced lignin content, whereas levels of all monolignol biosynthetic gene transcripts remained unchanged. A hierarchical genetic regulatory network (GRN) built by a bottom-up Graphic Gaussian Model algorithm provides additional support for a role of ptr-miR397a as a negative regulator of laccases for lignin biosynthesis. Full transcriptome based differential gene expression in the overexpressed transgenics and protein domain analyses implicate previously unidentified transcription factors and their targets in an extended hierarchical GRN including ptr-miR397a and laccases that coregulate lignin biosynthesis in wood formation. Ptr-miR397a, laccases and other regulatory components of this network may provide additional strategies for genetic manipulation of lignin content. Total twelve trees were used. Those include nine individual transgenic trees for overexpressing Ptr-miR397a, as nine biological replicates, and three wild-type trees.
2014-01-17 | E-GEOD-54153 | biostudies-arrayexpress
Project description:Secreted laccases are important enzymes on an ecological scale for their role in mediating plant-fungal interactions, but their function in fungal pathogenesis has yet to be elucidated. Ascomycete laccases have been primarily associagted with cell wall melanin deposition, and laccase mutants in ascomycete species often demonstrate reduced pigmentation. In this study, a putatively secreted laccase, Sslac2, was characterized from the broad host-range plant pathogen Sclerotinia sclerotiorum, which is largely unpigmented and is not dependent on melanogenesis for plant infection. Of the seven putative laccases in the S. sclerotiorum genome, Sslac2 was the only one found to be highly upregulated during pathogenesis of soybeans and was additionally found to be induced during growth on solid surfaces. Gene knockoues ot Sslac2 demonstrate wide ranging developmental defects, including abolished sclerotial formation, and are functionally non-pathogenic on unwounded tissue. While these mutants demonstrated a clear radial growth defect, enhanced growth was observed in liquid culture, likely due to altered hydrophobicity and thigmotropic responsiveness. Sslac2 mutants were also unable to respond to a host environment, and accordingly unable to differentiate penetration structures, respond appropriately to chemical stress, or produce the key virulence factor oxalic acid. Transmission and scanning electron microscopy of WT and mutant strains show apparent differences in extracellular matrix structure that may explain the inability of the mutant to respond to environmental cues. Targeting Sslac2 using host-induced gene silencing significantly improved resistance to S. sclerotiorum, suggesting that fungal laccases could be a valuable target of disease control. Collectively, we identified a laccase critical to the development and virulence of the broad host-range pathogen S. sclerotiorum and propose a potentially novel role for funal laccases in modulating environmental sensing.
2024-03-06 | GSE246683 | GEO
Project description:laccases-Differential expression in laccase mutants of Arabidopsis thaliana
| PRJNA126055 | ENA
Project description:The genetic basis for susceptibility or nonsusceptibility of plants to viruses is understood poorly. Two selectable tobacco etch virus (TEV) strains were developed for identification of Arabidopsis thaliana mutants with either gain-of-susceptibility or loss-of-susceptibility phenotypes. These strains conferred a conditional-survival phenotype to Arabidopsis based on systemic expression of herbicide resistance or proherbicide sensitivity genes, thereby facilitating mass selections and screens for Arabidopsis mutants that enhance or suppress TEV replication, cell-to-cell movement, or long-distance movement. A multicomponent mechanism that restricts systemic invasion of TEV was identified through isolation of gain-of-susceptibility mutants with alterations at two loci.
| S-EPMC15212 | biostudies-literature
Project description:Plant de novo fatty acid synthesis takes place in the plastid using acetyl-coenzyme A (acetyl-CoA) as the main precursor. This first intermediate is produced from pyruvate through the action of the plastidial pyruvate dehydrogenase complex (PDH), which catalyses the oxidative decarboxylation of pyruvate to produce acetyl-CoA, CO2, and NADH. For the proper functioning of this complex, lipoic acid is required to be bound to the dihydrolipoamide S-acetyltransferase E2 subunit of PDH. Octanoyltransferase (LIP2; EC 2.3.1.181) and lipoyl synthase (LIP1; EC 2.8.1.8) are the enzymes involved in the biosynthesis of this essential cofactor. In Arabidopsis plastids, an essential lipoyl synthase (AtLIP1p) and two redundant octanoyltransferases (AtLIP2p1 and AtLIP2p2) have been described. In the present study, the lipidomic characterization of Arabidopsis octanoyltransferase mutants reveals new insight into the lipoylation functions within plastid metabolism. Lipids and fatty acids from mature seeds and seedlings from Atlip2p1 and Atlip2p2 mutants were analysed by gas chromatography (GC) and liquid chromatography-electrospray ionization high-resolution mass spectrometry (LC-ESI-HRMS2), the analysis revealed changes in fatty acid profiles that showed similar patterns in both mutant seeds and seedlings and in the lipid species containing those fatty acids. Although both mutants showed similar tendencies, the lack of the AtLIP2p2 isoform produced a more acute variation in its lipids profile. These changes in fatty acid composition and the increase in their content per seed point to the interference of octanoyltransferases in the fatty acid synthesis flux in Arabidopsis thaliana seeds.
| S-EPMC6835903 | biostudies-literature
Project description:Arabidopsis sfr mutants are deficient in cold acclimation during exposure to coolnon-freezing temperatures. Although not visibly affected by the cold they have lost the ability to survive subsequent freezing. We plan to investigate how the sfr2 and sfr6 mutants respond to low temperature on the gene expression level. Wild type plants that have undergone identical treatments in parallel are necessary controls. The cold treatment of plants in the rosette stage (soil grown in a 8/16 hours day/night cycle) will be carried out in a cooled growth chamber at 4 degrees for 24 hours (same light regimetreatment starting/ending at the 4th hour of light). The aerial parts of the treated and untreated plants will be collected and frozen immediately in liquid nitrogen for RNA extraction. Comparison of the cold response of thousands of Arabidopsis genes in the wild type to the situation in our freezing sensitive mutants will enhance our understanding of the cold response itself and illuminate the effect of the mutations on the cold acclimation process. Experimenter name = Irene Bramke Experimenter phone = 01784 44 3770 Experimenter fax = 01784 43 4326 Experimenter address = Royal Holloway Experimenter address = University of London Experimenter address = School of Biological Sciences Experimenter address = Bourne Building Experimenter address = Laboratory 406 Experimenter zip/postal_code = TW20 OEX Experimenter country = UK Keywords: growth_condition_design; genetic_modification_design
2007-01-08 | GSE5711 | GEO