Hub members Have many expertise, covering most of the fields in bioinformatics and biostatistics. You'll find below a non-exhaustive list of these expertise
Searched keyword : Proteomics
Related people (5)
CV Senior Bioinformatician August 2015 – Present : Institut Pasteur, Paris PostDoc fellow 2011 – 2015 : Pascale Cossart’s laboratory, Unité des Interactions Bactéries-Cellules, Institut Pasteur, Paris Phd fellow 2007 – 2010 : Institut des Hautes Etudes Scientifiques, ann Ecole Normale Supérieure, Paris Magister of Science, Theoretical Physics 2003 – 2007 : Dynamical systems and statistics of complex matter, Université Paris 7 and Université Paris 6
BiophysicsMachine learningModelingProteomicsBiostatisticsDatabases and ontologiesHost-pathogen interactions
- Analysis of DNA methylation in the presence and absence of antibiotics in wt and mutant V. cholerae(Baharoglu ZEYNEP - Bacterial Genome Plasticity) - Closed
- Finding and Predicting CRISPR-Cas9 Efficiency(Jerome WONG NG - Synthetic Biology) - Closed
- Characterization of a Salmonella mutant carrying a single amino-acid substitution in the stress sigma factor RpoS(Françoise NOREL - Biochemistry of Macromolecular Interactions) - Closed
One of my projects consists in developing GRAVITY, a java tool based on Cytoscape to integrate genetic variants within protein-protein interaction networks to allow the visual and statistical interpretation of next-generation sequencing data, ultimately helping geneticists and clinicians to identify causal variants and better diagnose their patients. I’m also involved in several other projects in the lab, taking part in the design of pipelines for the processing and the analysis of genomics data, including SNP arrays, whole-exome and whole-genome sequencing data. This means being confronted to the big data problematic, the unit having to manage hundreds of terabytes of genomics data. Finally, I am now analysing these data in order to identify possible causes for autism, to help clinicians with their diagnosis but also to better understand the biological mechanisms at play in this complex disease. This is done through the project aiming at understanding the genetic architecture of autism in the Faroe Islands, and also with the newly starting IMI2 European project AIMS2-Trials.
AlgorithmicsData managementData VisualizationGenomicsMachine learningProteomicsGenome analysisBiostatisticsProgram developmentScientific computingApplication of mathematics in sciencesExploratory data analysisSofware development and engineeringData and text miningGenetics
After a PhD in bioinformatics at Inria/IRISA, Université de Rennes 1, Rennes (France), under the supervision of Dominique Lavenier and Pierre Peterlongo, I did a postdoc in bioinformatics at Laboratory of Ecology and Evolution of Plankton in Stazione Zoologica Anton Dohrn of Naples, Italy. Both my thesis and my postdoc were about the Tara Oceans projet and the development of new software to analyze huge quantities of raw reads coming from metagenomics sample. I am currently occupying a research engineer position at the Hub as leader of ALPS group and focus on several different computing problems including metagenomics, protein assembly and several short term developments.
AlgorithmicsData managementProteomicsDatabaseProgram developmentScientific computingSofware development and engineeringComparative metagenomics
- Analysis of neuronal population dynamics in rodents during virtual navigation(Christoph SCHMIDT-HIEBER - Neural circuits for spatial navigation and memory) - Pending
- Recombination among enteroviruses(Maël BESSAUD - Biology of Enteric Viruses) - Pending
- Identification of new or unexpected pathogens, including viruses, bacteria, fungi and parasites associated with acute or progressive diseases(Marc ELOIT - Biology of Infection) - In Progress
Dr. Natalia Pietrosemoli is an Engineer with a M. Sc. in Modeling and Simulation of Complex Realities from the International Center for Theoretical Physics, ICTP and the International School of Advanced Studies, SISSA (Triest, Italy). During her M. Sc. internships she mostly worked in modeling, optimization, combinatorics and information theory applied to medical imaging. In 2012 she got a Ph. D in Computational Biology from the School of Bioengineering of Rice University (Houston, TX, US), where she specialized in computational structural biology and functional genomics. Her doctoral thesis “Protein functional features extracted with from primary sequences : a focus on disordered regions”, contributed to a better understanding of the functional and evolutionary role of intrinsic disorder in protein plasticity, complexity and adaptation to stress conditions. As part of her Ph. D., Natalia was a visiting scholar in two labs in Madrid: the Structural Computational Biology Group at the Spanish National Cancer Research Centre (CNIO), where she mainly worked in sequence analysis and the functional-structural relationships of proteins, and the Computational Systems Biology Group at the Spanish National Centre for Biotechnology (CNB-CSIC ), where she studied the functional implications of intrinsically disordered proteins at the genomic level for several organisms, collaborating with different experimental and theoretical groups. In 2013, she joined the Swiss Institute of Bioinformatics as a postdoctoral fellow in the Bioinformactics Core Facility. Her main project consisted in the molecular classification of a rare type of lymphoma, which involved the integration of transcriptomic, clinical and mutational data for the identification of molecular markers for classification, diagnosis and prognosis. This work was performed in collaboration with the Pathology Institute at the University Hospital of Lausanne (CHUV). In November of 2015 Natalia joined the Hub Team @ Pasteur C3BI as a Senior Bioinformatician. Natalia is especially interested in the integrative analysis of different omics data, both at large-scale and for small datasets, and loves collaborating in interdisciplinary environments and having feedback from her fellow experimental colleagues. Currently, she’s coordinating several projects performing functional and pathway analysis at the genomic level. By grouping genes, proteins and other biological molecules into the pathways they are involved in, the complexity of the analyses is significantly reduced, while the explanatory power increases with respect to having a list of differentially expressed genes or proteins.
AlgorithmicsData managementGenomicsImage analysisMachine learningModelingProteomicsSequence analysisStructural bioinformaticsTranscriptomicsDatabaseGenome analysisBiostatisticsScientific computingDatabases and ontologiesApplication of mathematics in sciencesData and text miningGeneticsGraphics and Image ProcessingBiosensors and biomarkersClinical researchCell biology and developmental biologyInteractomicsBioimage analysis
- Mitochondrial polarization identifies functionally mature human NK cells(Laura SURACE - Innate Immunity) - In Progress
- Proteomic analysis of the intracellular compartments containing Brucella abortus(Javier PIZARRO-CERDA - Yersinia) - In Progress
- Secretome Analysis of OIS IL6KO SASP(Mathieu VON JOEST - Cellular Plasticity And Disease Modelling) - In Progress
Related projects (22)
The aim of the project is to create a viewer that will help visualisation and correlation between genomic, transcriptomic, proteomic and metabolomic data generated by the comparison of amastigote and promastigote stages of the Leishmania donovani parasite.
Skeletal muscle stem cells constitute a population of cells with heterogeneous properties. Interestingly, muscle stem cells have a remarkable capacity to regenerate muscle fibres after regeneration. We are performing a molecular analysis of these stem cells.
Hydrogen deuterium exchange detected by mass spectrometry (HDX-MS) is a powerful technique to probe the conformation and dynamics of proteins. Over the past 10 years, the HDX-MS workflow has been optimized and automatized leading to a rapid expansion of the technology in both academic lab and pharmaceutical companies. Thanks to these improvements, modern HDX-MS can be applied to investigate more complex biological systems, including large protein complexes and membrane proteins. However, the higher the size of the protein under study, the more complex the HDX-MS data. Several noncommercial and commercial software solutions have been developed to help for the analysis of HDX-MS data. We are currently using DynamX 3.0 that is a Waters-specific product specifically designed for the nanoACQUITY UPLC system with HDX technology. The aim of the project is to design and implement a statistical tool compatible with the output generated by DynamX to read ily validate results obtained with large protein complexes.
Currently there is increased focus for developing novel antibacterial strategies. The demand is driven by the rise in antibiotic resistance bacteria and many Gram-negative bacteria are on the list of increasingly drug resistant agents. A major target of successful antibiotics is the bacterial cell wall. The target of these drugs is often defined but what is much less understood is the off-target impact of these very important antibiotics. We designed and executed a mutli-omics strategy centered on the Gram-negative pathogen H. pylori. Our goal is to identify potential 'therapeutically susceptible' pathways associated with the physiological response to cell wall stress.
L'extraction des protéines humaines qui interagir avec des protéines virales par le séquençage des barcodes associés avec les protéines humaines et virales. Analyses structurales des protéines virales et humain pour trouver les sites d’accrochage.
Analyses fonctionnel des protéines humains de type ubiquitin qui interagir avec les virales protéines de la grippe
Over the past three decades Listeria has become a model organism for host-pathogen interactions, leading to critical discoveries in a broad range of fields including virulence-factor regulation, cell biology, and bacterial pathophysiology. More recently, the number of Listeria “omics” data produced has increased exponentially, not only in term of number, but also in term of heterogeneity of data. There are now more than 40 published Listeria genomes, around 400 different transcriptomics data and 10 proteomics studies available. The capacity to analyze these data through a systems biology approach and generate tools for biologists to analyze these data themselves is a challenge for bioinformaticians. To tackle these challenges we are developing a web-based platform named Listeriomics which integrates different type of tools for “omics” data manipulation, the two most important being: 1) a genome viewer for displaying gene expression array, tiling array, and RNASeq data along with proteomics and genomics data. 2) An expression atlas, which is a query based tool which connects every genomics elements (genes, smallRNAs, antisenseRNAs) to the most relevant “omics” data. Our platform integrates already all genomics, and transcriptomics data ever published on Listeria and will thus allow biologists to analyze dynamically all these data, and bioinformaticians to have a central database for network analysis. Finally, it has been used already several times in our laboratory for different types of studies, including transcriptomics analysis in different biological conditions, and whole genome analysis of Listeria proteins N-termini. This project is funded by an ANR Investissement d'avenir: BACNET 10-BINF-02-01
Label free quantification of proteins after the infection with M. tuberculosis. Macrophages isolated from seven patients were used in this study. Four conditions were compared.
Mycolactone, the lipid toxin produced by Mycobacterium ulcerans, has recently been shown to target the Sec61 transolcon, blocking protein translocation accross the ER membrane. As Sec61 has also been proposed as a critical mediator in cross-presentation in dendritic cells, this analysis aims to analyse mycolactone effects on the proteome of dendritic cells.
Our team is dedicated to understanding the mechanisms involved in cytokinesis. A screen has been performed and should help us better understand this process.
Cryptococcus neoformans is a ubiquitous yeast present in the environment that is able to interact closely with numerous organisms including amoeba, paramecium or nematodes. The interaction with these organisms shaped its virulence with acquisition of infectious properties as a consequence especially in mammals . The ability to survive nutrient starvation, oxidative stress, desiccation, both in the environment and during infection, indicates a high level of physiological and metabolic plasticity of the yeast. In humans, after primary infection during childhood, the yeast is able to survive within the host for years before reactivation upon immunosuppression, leading to a life threatening disseminated fungal infection. This phenomenon, called dormancy / quiescence is one of the main biological features of this fungus in relation with disease's pathogenesis. It is well known in bacteria (tuberculosis), parasites (Plasmodium, Toxoplasma). In C. neoformans, dormancy has only been demonstrated epidemiologically in our laboratory but not experimentally so far. We developed an assay where yeasts cells exhibiting characteristics of potentially dormant cells were generated. Indeed, dormant cells are characterized by a low metabolic activity sometimes undetectable under normal laboratory conditions, altered growth capacity, and the ability to resuscitate upon adequate stimulus. Dormant cells are known to have increased mitochondrial masse and activity justifying a screening strategy of a collection of KO mutants for mitochondrial proteins. In parallel the whole proteome, transcriptome and secretome will be obtain with the ambition to correlate these parameters. Our current project aims at exploring the metabolism of the dormant yeast to have a comprehensive picture of the pathways that are required for the maintenance of dormancy and fo exit from dormancy.
Rapid and accurate identification of microorganisms is a prerequisite for appropriate patient care and infection control. In the last decade, Mass Spectrometry (MS) has revolutionized the field of clinical microbiology with the introduction of MALDI-TOF for rapid microbial identification. However, MALDI-TOF MS suffers from important limitations. Some bacteria remain difficult to identify, either because they do not give a specific profile or because the database lacks the appropriate reference. In addition, the discriminatory power of the technique is often insufficient for reliably differentiating sub-species within species or clones within sub-species. More importantly, virulence or resistance determinants cannot be characterized, which is a severe obstacle for appropriate patient care and antibiotics prescription in hospitals. In recent years, proteomics approaches have been increasingly used to study host-pathogen interactions. State-of-the-art bottom-up approaches rely on the enzymatic digestion of proteins and LC-MS/MS analysis of peptides. In contrast, top-down proteomics is an emerging technology based on the analysis of intact proteins by high-resolution mass spectrometry. The major advantage of top-down proteomics is its ability to address protein variations and characterize proteoforms arising from alternative splicing, allelic variation, or post-translational modification. We have recently set-up a robust top-down proteomics platform for the analysis of intact bacterial proteomes. Our final objective is to use this platform to better characterize bacterial pathogens in a clinical context, but a major requirement to achieve this goal is to build up accurate bacterial proteoform databases.
Shigella species and E. coli are very closely related bacteria belonging to the Enterobacteriaceae family. Phenotypically they are very similar and genotypically they could be considered the same species. The differentiation of Shigella species from E. coli is a significant diagnostic challenge for the clinical microbiology laboratories. They increasingly use maldi-tof mass spectrometry-based microbial identification systems but the latter are currently not able to distinguish these species. As the National Reference Center of E. coli and Shigella, we possess an exhaustive and extensive collection of strains (all serotypes and a wide range of phenotypic profils). We want to use our unique strain collection to propose a highly performant approach for differentiating these bacterial species by MALDI-TOF MS. Success of this study would be incredibly valuable for making an immediate impact on the clinical microbiology diagnosis.
Despite effective prevention against HBV infection, 300 million people worldwide are chronic HBV carriers, of whom 25% will die of liver cirrhosis or hepatocellular carcinoma (HCC). Current treatments for chronic hepatitis B (CHB) are inefficient to completely clear the virus and liver cancer is a lethal disease, thus representing an area of highly unmet medical need. Viral persistence is due to the maintenance, in the nuclei of infected cells, of the viral nuclear DNA : the cccDNA that is not targeted by the antiviral treatment and to the impairment of both the innate and adaptive immune responses that accompanies CHB infection. Viral replication depends on a balance between factors that benefit and those that restrict viral infection. However little is known about cellular factors that repress HBV replication. Using quantitative temporal viromics approach developed by P. Lenher in Cambridge we have performed a quantitative analysis of temporal changes in host and viral proteins in primary human hepatocytes through the course of HBV infection. We will in particular search for cellular factors involved in virus restriction and uncover the mechanism of viral escape.
NOXO1 interacting partners in intestinal epithelial cells under inflammatory and infectious conditions
Nicotinamide adenine dinucleotide phosphate (NADPH) oxidases (or NOX) are a unique family of enzymes dedicated to the production of reactive oxygen species (ROS) such as superoxide anion (O.-2) and hydrogen peroxide (H2O2) (1). This family includes NOX1-5, DUOX1 and DUOX2 and has been defined on the basis of its members’ structural homology with gp91PHOX (now renamed NOX2), the catalytic core of the phagocyte NADPH oxidase. A functional phagocytic NADPH oxidase complex consists of the membrane-anchored flavocytochrome b558 (the catalytic core of the enzyme composed of gp91PHOX and p22PHOX), the regulatory cytosolic proteins p47PHOX, p67 PHOX, p40 PHOX, and the low molecular-weight GTP-binding proteins, Rac 1 or 2 . NADPH oxidase 1 (NOX1), the first homologue of gp91PHOX identified in colon epithelial cells, is the NOX family member most closely related to phagocytic NADPH oxidase in terms of its structure and function . NOX1, NOXO1 and NOXA1 transcripts are abundantly expressed in the colon where they could be involved in mucosal innate immunity under physiological conditions . During inflammatory and infectious conditions NOXO1 is the mostly upregulated subunit [5-6].
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Neutrophils are the most abundant immune cells circulating in the blood and recruited to infectious sites. Neutrophil survival is a critical aspect for their study in vitro. We propose to study the impact of anoxia and GCSF treatment on neutrophil cytosolic protein abundance
The central part of the intercellular bridge connecting the two daughter cells during cytokinesis is a highly dense structure named the Midbody first described by Flemming in 1891. Work in the past te
Cellular senescence is a stable cell cycle arrest that can be triggered by various biological stresses. Importantly, senescent cells remain metabolically active and secrete numerous molecules, such a
Integration and advanced statistical analyses of complex datasets for host factor identification involved in Salmonella and Shigella intracellular niche formation
Salmonella enterica serovar Typhimurium (S. Tm) and Shigella flexineri actively invade non-phagocytic human epithelial cells in a similar fashion. Both pathogens use bacterial effectors injected throu
Listeriolysin S (LLS) is a bacteriocin from Listeria monocytogenes that targets other Gram-positive bacteria, including Listeria monocytogenes itself. In order to understand the mechanism of action of