Salomé Nashed, PhD student in the Genetic Networks team, has been
rewarded with the “prix Jeune Talent France L'Oréal-UNESCO pour les
Femmes et la Science”. Congratulations Salomé!
See article at SU here.
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Gene duplication is a major source of functional diversification. However, the co-existence of two paralogues with similar biochemical properties but diverging functions can lead to potentially detrimental competition between the duplicates. This phenomenon has been named “paralogue interference”. In a recent article published in "Frontiers in cellular infection and microbiology, the "genetics networks" team of LCQB has addressed this question in the human pathogen Candida glabrata. They showed that evolution selected mutations which decreased competition between two, potentially interfering, transcription factors, thus allowing the emergence of the particular modes of regulation for respiration and iron homeostasis observed in extent Saccharomycetaceae species.
Link to the article
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A global study of 60 cities' microbes finds each has a signature microbial fingerprint. The project provides a great way to communicate about the invisible world of commensal microorganisms. Members at the LCQB, L3 and M1 Sorbonne’s students involved in our Bioinformatics courses and colleagues from other Sorbonne departments contributed to the collect of the samples for the Paris area. The article just appeared in Cell.
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To avoid deleterious misfolding of proteins, the assembly of multiprotein complexes is tightly controlled and can either occur co-translationally in the cytoplasm or as a spatially restricted event by targetting ribosomes at particular subcellular locations. In an article recently published in Molecular Cell, Benoit Palancade's team (Institut Jacques Monod) showed that both phenomenon are at play in the biogenesis of the nucleopore, one of the largest multiprotein complex in the cells. The "genetics networks" team from LCQB contributed to this work by conducting genome-wide analyses of the interactions between nucleoporins (key nucleopore subunits) during translation
Link to the article
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Phenotypic diversity can arise from changes in the gene content of the genomes but also from modifications in the regulation of gene expression. The "genetic networks" team compared gene expression in 8 yeast species to find "regulatory outliers", i.e. conserved genes with special expression profiles compared to their orthologues. The combination of this approach with other functional genomics data (transcriptomics analyses and chromatine immunoprecipitation followed by deep sequencing) led us to identify two genes which are involved in the survival of the human pathogen Candida glabrata upon iron starvation conditions. Iron starvation being a key challenge for C. glabrata survival in blood, this discovery may help us to better understand the invasive strategy of this emerging pathogen.
To the Article
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Pierre Louis Blaiseau of the Genetic Networks team recently published « Monod and the phenomenon of diauxie » in the Bulletin d’Histoire et d’Epistémologie des Sciences de la vie. This article described a part of the scientific activity of the Jacques Monod until then neglected by the historians: its interest during all its career for the mechanisms of enzymatic inhibition. Besides, it showed that, contrary to the standard narratives, the phenomenon of « diauxie » (double growth) was discovered by Monod during his thesis and not by the previous Frederic Diénert’s work
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F. Devaux's team published one of the first ChIP-seq-based description of the transcriptional regulatory networks in the pathogenic yeast Candida glabrata. This work, which was performed in collaboration with J-M. Camadro and G. Lelandais from the Jacques Monod Institute and with the NGS platform directed by S. Le Crom, is the first publication from a larger ANR project aiming at a comprehensive description of stress response regulatory networks in this emerging human pathogen.
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Nitric oxyde oxydases are enzymes which contributes to the resistance of pathogenic microbes to the innate immune system by detoxifying nitric oxide. "The genetic networks" team identified a new regulator of the expression of nitric oxydases in fungi and deciphered its functioning and evolution in different pathogenic and non-pathogenic yeast species.
http://www.ncbi.nlm.nih.gov/pubmed/25732006
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