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ABSTRACT:
PROVIDER: PRJNA551794 | ENA |
REPOSITORIES: ENA
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Project description:Shewanella oneidensis is an important model organism for bioremediation studies because of its diverse respiratory capabilities. In recent years, biofilm development of S. oneidensis has been extensively studied because it is essential to reduce solid metals. As a special form of biofilm, however, pellicles are largely overlooked. The goal of this work was to understand requirements of S. oneidensis pellicle formation and the molecular basis of pellicle formation. We demonstrated that successful pellicle formation and survival was likely to require the threshold level of cell density and higher concentration of oxygen. Proteinase K and EDTA were potent pellicle disrupter. DNA microarray experiments were used to study the gene expression profile of young air–liquid interface pellicle relative to planktonic cells, which indicated that the air–liquid interface pellicle was more metabolically active than the planktonic cells. Most notably, consistently up-regulation of iron or heme uptake and transportation proteins was observed in the S. oneidensis MR-1 pellicle. However, neither the hmuT nor hugA heme transport mutant was defective in pellicle formation. An examination of the influence of several metal cations on the anti-pellicle activity of EDTA showed that Ca (II), Mn(II), Cu(II), and Zn(II) fully protected S. oneidensis MR-1 pellicle against EDTA treatment while additional of iron enabled the initiation of pellicle formation but maturation was significantly impaired. Collectively, iron was less important than other metals with respect to pellicle formation in S. oneidensis.
2010-09-01 | GSE14331 | GEO
Project description:One of the most distinct features of Pseudoalteromonas sp. SCSIO 11900 is its ability to form a very robust pellicle than most Pseudoalteromonas strains. Thus we want to identify the genes essential for the pellicle formation of SCSIO 11900. We compared transcriptom profiles of planktonic cells, initial pellicle and mature pellicle of coral Pseudoalteromonas sp. SCSIO 11900 and revealed that some unique genes from horizontal gene transfer is involved in the pellicle formation of SCSIO 11900.
2017-04-04 | GSE97322 | GEO
Project description:Shewanella oneidensis is an important model organism for bioremediation studies because of its diverse respiratory capabilities. In recent years, biofilm development of S. oneidensis has been extensively studied because it is essential to reduce solid metals. As a special form of biofilm, however, pellicles are largely overlooked. The goal of this work was to understand requirements of S. oneidensis pellicle formation and the molecular basis of pellicle formation. We demonstrated that successful pellicle formation and survival was likely to require the threshold level of cell density and higher concentration of oxygen. Proteinase K and EDTA were potent pellicle disrupter. DNA microarray experiments were used to study the gene expression profile of young air–liquid interface pellicle relative to planktonic cells, which indicated that the air–liquid interface pellicle was more metabolically active than the planktonic cells. Most notably, consistently up-regulation of iron or heme uptake and transportation proteins was observed in the S. oneidensis MR-1 pellicle. However, neither the hmuT nor hugA heme transport mutant was defective in pellicle formation. An examination of the influence of several metal cations on the anti-pellicle activity of EDTA showed that Ca (II), Mn(II), Cu(II), and Zn(II) fully protected S. oneidensis MR-1 pellicle against EDTA treatment while additional of iron enabled the initiation of pellicle formation but maturation was significantly impaired. Collectively, iron was less important than other metals with respect to pellicle formation in S. oneidensis. A fresh colony grown overnight on a LB plate was used to inoculate 50 ml LB and incubated in a shaker (200 rpm) to an OD600 of 0.8 at the room temperature. This culture was then diluted 500-fold with fresh LB, resulting in the starting cultures. Aliquots of 30ml starting cultures were transferred to 50-ml Pyrex beakers and allowed to develop pellicles at the room temperature. When a complete but thin (young pellicle) at the interface were formed (about 30h hours), planktonic culture and pellicle were separated and applied to centrifugation at 8000 rpm for 3 min at room temperature. 3 parallel starting cultures were used and 3 samlpes of pellicle cells or planktonic cells were collected at 30h. RNA from the pellicle cells was fluorescently labeled with Cy3, and that from the planktonic was labeled with Cy5.
2010-09-01 | E-GEOD-14331 | biostudies-arrayexpress
Project description:We compared genetic profiles of planktonic stage to biofilm stage of deep sea bacterium Pseudoalteromonas sp. SM9913 and revealed genetic features during switch from planktonic to pellicle stage in Pseudoalteromonas sp. SM9913. mRNA profiles of Pseudoalteromonas sp. SM9913 planktonic cells, initial pellicle cells and mature pellicle cells were generated by Illumina Hiseq2000.
2015-11-03 | E-GEOD-74569 | biostudies-arrayexpress
Project description:To investigate the gene expression profile of pellicle cells of Pseudomonas aeruginosa, microarray analysis was performed. Transcriptome profiles of pellicle cells and planktonic cells grown in LB medium were determined by Affymetrix GeneChip. Gene expression pattern that is specific to pellicle cells was evaluated by comparing the data set with that of planktonic cells.
2011-03-31 | GSE24784 | GEO
Project description:Walnut (Juglans regia L.) is an important nut fruit crop mainly grown for its high nutritional and medicinal value. In walnut fruit, the pellicle is the main source of polyphenols (such as proanthocyanidins), which are natural bioactive compounds but also cause astringency and bitterness for walnut fruit consumption. However, the gene regulatory networks of phenolic biosynthetic pathways remain largely unknown in walnut pellicles. Here, we performed RNA sequencing (RNA-seq) to identify differentially expressed genes (DEGs) associated with pellicle development in walnut. In this study, seven developmental stages (8-, 9-, 11-, 13-, 15-, 17-, and 19-week after pollination) of ‘Xinwen179’ pellicle tissues were harvested to conduct further transcriptome-wide profiles. Via RNA-seq, we explored several key DEGs involved in the phenolic biosynthetic pathway, such as dihydroflavonol-4-reductase (DFR), leucoanthocyanidin reductase (LAR), anthocyanidin synthase (ANS) and anthocyanidin reductase (ANR), which are dynamically expressed at developmental stages of the walnut pellicle. Taken together, our preliminary investigation on DEGs associated with pellicle development will not only elucidate the gene regulatory networks of the phenolic biosynthetic pathway for pellicle development, but also contribute to the broad spectrum of RNA-seq data resources for further genetic improvement of walnut.
2022-08-30 | GSE209790 | GEO
Project description:To investigate the gene expression profile of pellicle cells of Pseudomonas aeruginosa, microarray analysis was performed. Transcriptome profiles of pellicle cells and planktonic cells grown in LB medium were determined by Affymetrix GeneChip. Gene expression pattern that is specific to pellicle cells was evaluated by comparing the data set with that of planktonic cells. Pseudomonas aeruginosa wild type (PAO1ut) strain was cultivated aerobically in LB in Erlenmeyer flasks under static or shaking conditions, and total RNAs were extracted at 24 hours (static culture) and early stationary phase (OD600 = 1.4, shaking culture). The experiment was performed in duplicate independent cultures.
2011-03-31 | E-GEOD-24784 | biostudies-arrayexpress
Project description:Triplicate 10mL cultures of M. tuberculosis grown in Sautons media without detergent in planktonic (exponential growth phase at OD600 0.2) compared to pellicle (3 weeks growth without shaking in 5% CO2) conditions. comparison of pellicle growth transcriptome to planktonic growth transcriptome, 3 biological replicates, third is dye-flip
2013-05-24 | E-GEOD-37392 | biostudies-arrayexpress