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 I work on understanding the genetic and epigenetic mechanisms involving the RRS1/RPS4 protein complex anchored on the chromatin and allowing the triggering of the immune response.

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I develop and implement different approaches of protein biochemistry (transient expression in N. benthamiana via A. tumefaciens, recombinant protein production in E. coli, protein purification on affinity resins, immunoblot analysis, confocal microscopy (FRET-FLIM) in partnership with the TRI-FRAIB platform, MS-MS protein sequencing in partnership with the proteoTOul-FRAIB proteomics platform) dedicated to the characterization of post-translational modifications that concern different type III effectors of plant pathogenic bacteria (Rastonia solanacearum, Xanthomonas campestris) as well as plant immune receptors (NLRs) Our goal is to understand the importance of these modifications in the establishment of the molecular dialogue between bacteria and their host plants (virulence and avirulence functions of effectors, signaling activities of immune receptors).

I am also a competent person in radiation protection for the unit.

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I was recruited as a research engineer at CNRS in December 2001. After working 12 years at the Evolution and Biological Diversity Laboratory (EDB) in Toulouse, I validated the Master 2 Professional Microbiological Diagnosis Innovative Approaches of Toulouse III and taught SVT in secondary education, on secondment, for 2 years.

I joined the Laboratoire des Interactions Plantes Microbes Environnement (LIPME) in September 2016.

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Roots represent an important opportunistic entryway for a number of soil pathogens. Amongst pathogenic organisms, vascular pathogens penetrate the root system to infect and cause symptoms within the aerial parts of host plants such as their leaves.

This is the case for the phytopathogenic vascular bacterium R. solanacearum. By working on the pathosystem composed of the phytopathogenic bacteria R. solanacearum and the model plant Arabidopsis thaliana, great progress has been made in understanding the molecular mechanisms underlying the activation of the immunoreceptor to bacterial effectors. Although being very interesting and fundamental, numbers of data have been accumulated through experiments carried out at the foliar level and early steps involved in immune responses in the root are still blurry and is a real missing link in our understanding to pathogen attack.

 

The goal of the project is to investigate the response in A. thaliana roots challenged with R. solanacearum and the impact of elevated temperature to plant response.

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My research interest is to decipher the molecular mechanisms involved in plant adaptation in response to environmental signals.

I completed my PhD in the Institut de Biotechnologie des Plantes (IBP) at Paris XI University under the supervision of Prof P. Gadal and Dr J. Vidal, in 1995. My thesis project was focused on the photoregulation of the Phosphoenolpyruvate carboxylase (PEPC) implicated in C4 photosynthesis, more particularly on the identification of the PEPC-kinase and the components of the signal transduction pathway. During my post-doctoral contract in Prof. G. Hardie’s group in the MRC-PPU at the University of Dundee (Scotland), the aim of my research was to define the regulation by phosphorylation of the plant homologous of the mamalian AMP-activated protein kinase (APMK) and the yeast SNF1. In october 1996, I was appointed lecturer of the University of Toulouse3, Paul Sabatier. My research works successively dealt with the functional study of AtLecRK-a genes encoding Receptor-like Kinases and the plant cell wall dynamics with a focus on (i) the transcriptional regulation of genes involved in lignin biosynthesis in Eucalyptus (ii) the fonction of cell wall proteins and especially AtLTP2, a Lipid Transfer Protein implicated in the cuticule-cell wall integrity.

Since september 2020, I have joined the Plant Resistance Pathways Dynamics and Adaptation to Climate Change, REACH team in LIPME, to expand research of the identification of mechanisms involved in plant immunity against pathogenic bacteria and the characterization of its signalling pathway.

Despite major advances in our understanding in NLRs activation, there is little information relating to the composition and the dynamics of proximal proteome that involves in activation and in cell signalling of NLRs. Based on previous 2-hybrid screening, selected Arabidopsis thaliana proteins found to potentially interact with the PopP2 Ralstonia solanacearum effector, will be functionnaly characterized. Moreover, the recent proximity labeling technology is carried out for inventorying proteome which in vivo interacts with PopP2 and its associated NLRs immune receptors. The aim is to establish the most exhaustive list of PopP2 protein partners, to define their molecular mechanism of action and their function in the context of virulence or avirulence interactions mediated by PopP2.

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Academic training : I did my graduate studies at the University of Paris XI (Orsay Faculty of Sciences) :

-Doctoral thesis (Honorable mention and congratulations of the jury)

-DEA in Molecular and Cellular Plant Biology (with honors)

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Teaching :

At the University Toulouse3-Paul Sabatier, I teach the disciplines of Molecular Genetics, Cellular and Molecular Biology, Biochemistry and Biotechnology and Plant Molecular Physiology at the Licence and Master levels.

My pedagogical (co-) responsibilities (Training and Teaching Units) :

-Master Biotechnologies "Quality and Safety of Health Products and Food" specialty and "Bio-Engineering, Research and Biomedical Application" specialty (from 2022)

-Master Bioengineering - Plant Biotechnologies (2000-2016)

-IUP Bioengineering - Plant Biotechnologies (1997-2011)

-10 Teaching units of Master 1 and 2 (period 2000 to 2022)

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Titulaire d'un double diplôme Ingénieur agronome (Agrocampus Ouest) - Master Adaptation, Développement et Amélioration des plantes en présence de Microorganismes (Université Toulouse III - Paul Sabatier), j'ai voulu m'orienter vers la recherche en pathologie/parasitisme pendant mon parcours. 

En Master 1, j'ai effectué mon stage au centre d'Ecologie Fonctionnelle et Evolutive à Montpellier sur l'étude de communautés d'acariens prédateurs du pou rouge de la poule pondeuse. En Master 2, j'ai rejoint le LIPME dans l'équipe REACH, pour commencer à étudier sur le sujet qui constituera ensuite ma thèse que je suis en train de faire. Grâce à ce stage de Master 2 et ma thèse, je développe mes compétences en biologie moléculaire en lien avec la phytopathologie et l'épigénétique.

 
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Lea Monge_Waleryszak

PhD

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My research focuses on identifying and characterizing in planta protein targets of an
important effector from the phytopathogenic bacteria Ralstonia solanacearum. For that
purpose, I use a BioID approach in model plants such as Nicotiana benthamiana and
Arabidopsis thaliana. As Ralstonia solanacearum is one of the most destructive
phytopathogens there is and quickly gaining Europe, helped by a warmer climate, it is only
essential to understand the mechanisms underlying its virulence in order to fight it and
protect food safety

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Ministerial funding due to the obtention of a PhD contract through competitive examination
by the SEVAB doctoral school jury.

 

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Toulouse Midi-Pyrénées Genopole Proteomics Platform, Institute of Pharmacology and
Structural Biology (IPBS)

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Doctoral teaching contract with the University of Toulouse III - Paul Sabatie

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Linkedin: in/lea-m-waleryszak
Twitter: @LWaleryszak

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I have a bachelor degree in Biology of the Organisms, Populations & Ecosystems which
gave me a notion of a whole, a most important integrated vision of the living. I continued with
a Master degree in Adaptation, Development & Improvement of Plants in the Presence of
Microorganisms. This represents a specialization in molecular biology in the context of
plants-microorganisms interactions. I produced a master thesis on a long non coding ARN
potentially involved in nodule development during the Medicago truncatula-Sinorhizobium
meliloti symbiosis. This work was based on my internship with the ENOD research team at
the LIPME (Endosymbiotic Infection & Nodule Development). Such a close interaction
between a plant and a bacterium reflects a strong coevolution and complex molecular
mechanisms. This is true in the context of mutualistic interactions as well as in pathogenic
interactions. For my PhD, I decided to explore the latter. Hence, I joined the REACH
research team at the LIPME and I am currently studying molecular mechanisms allowing the
pathogenic bacteria Ralstonia solanacearum to infect its host plant and induce death.

 
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As part of my second year of a master's degree in "Plants, Molecular Biology and Biotechnology" at the University of Strasbourg, I am doing a six-month internship in the REACH team. My internship subject concerns the identification and characterization of plant components involved in the function and signaling of NLRs immune receptors under high temperature conditions, in particular thanks to a proximity labeling approach, the TurboID.

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