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Junier, Pilar
Nom
Junier, Pilar
Affiliation principale
Fonction
Professeure assistante
Email
pilar.junier@unine.ch
Identifiants
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Voici les éléments 1 - 10 sur 57
- PublicationAccès librePhysical Isolation of Endospores from Environmental Samples by Targeted Lysis of Vegetative Cells(2016)
; ; ; Endospore formation is a survival strategy found among some bacteria from the phylum Firmicutes. During endospore formation, these bacteria enter a morpho-physiological resting state that enhances survival under adverse environmental conditions. Even though endospore-forming Firmicutes are one of the most frequently enriched and isolated bacterial groups in culturing studies, they are often absent from diversity studies based on molecular methods. The resistance of the spore core is considered one of the factors limiting the recovery of DNA from endospores. We developed a method that takes advantage of the higher resistance of endospores to separate them from other cells in a complex microbial community using physical, enzymatic and chemical lysis methods. The endospore-only preparation thus obtained can be used for re-culturing or to perform downstream analysis such as tailored DNA extraction optimized for endospores and subsequent DNA sequencing. This method, applied to sediment samples, has allowed the enrichment of endospores and after sequencing, has revealed a large diversity of endospore-formers in freshwater lake sediments. We expect that the application of this method to other samples will yield a similar outcome. - PublicationAccès libreExploiting the fungal highway: development of a novel tool for the in situ isolation of bacteria migrating along fungal mycelium(2015)
; ; ; ; - PublicationAccès libreGenome Sequence of Aeribacillus pallidus Strain GS3372, an Endospore-Forming Bacterium Isolated in a Deep Geothermal Reservoir(2015)
; ; ; - PublicationMétadonnées seulementGenome Sequence of Kosakonia radicincitans Strain YD4, a Plant Growth-Promoting Rhizobacterium Isolated from Yerba Mate (Ilex paraguariensis St. Hill.)(2015)
; - PublicationMétadonnées seulementMLgsc: A Maximum-Likelihood General Sequence Classifier(2015)
; ; We present software package for classifying protein or nucleotide sequences to user-specified sets of reference sequences. The software trains a model using a multiple sequence alignment and a phylogenetic tree, both supplied by the user. The latter is used to guide model construction and as a decision tree to speed up the classification process. The software was evaluated on all the 16S rRNA gene sequences of the reference dataset found in the GreenGenes database. On this dataset, the software was shown to achieve an error rate of around 1% at genus level. Examples of applications based on the nitrogenase subunit NifH gene and a protein-coding gene found in endospore-forming Firmicutes is also presented. The programs in the package have a simple, straightforward command-line interface for the Unix shell, and are free and open-source. The package has minimal dependencies and thus can be easily integrated in command-line based classification pipelines. - PublicationAccès libreGenome Sequence of Bacillus alveayuensis Strain 24KAM51, a Halotolerant Thermophile Isolated from a Hydrothermal Vent(2015)
; ; ; - PublicationAccès libreGenome Sequence of Anoxybacillus geothermalis Strain GSsed3, a Novel Thermophilic Endospore-Forming Species(2015)
; ; ; ; - PublicationMétadonnées seulementGenetic diversity of Rhizobium present in nodules of Phaseolus vulgaris L. cultivated in two soils of the central region in Chile(2014-4-1)Although Phaseolus vulgaris L. is native from the Americas and is currently cultured in diverse areas, very little is know about the diversity of symbiotic nitrogen fixing Rhizobium (mycrosymbiont) in many of those cultures. Therefore, the aim of this study was to assess the genetic diversity of Rhizobium present in nodules of P. vulgaris in the central region of Chile. A method to extract DNA from surface-sterilized nodules was applied to two populations of the same seed variety grown in different fields. The 16S rRNA and nifH genes were amplified directly from the DNA extracted. DGGE analysis and clone libraries showed a restricted genetic diversity of the microsymbiotic populations that nodulate P. vulgaris. Both molecular markers revealed the presence of a microsymbiont closely related to Rhizobium etli in all the plants from the soils studied, indicating that the populations of Rhizobium spp. nodulating P. vulgaris in the central region of Chile displayed an extremely low genetic diversity. The level of genetic diversity in microsymbiont populations in plants grown in soils with different origin suggested that other factors rather than the indigenous soil rhizobial populations play a major role in the selection of the symbiotic partner in P. vulgaris.
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