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Accueil > Equipes de Recherche > Dynamique Microbienne et Transmission Virale > DMTV


Team Leader : Claire VALIENTE MORO

Team :

Permanent members
LAVILETTE Dimitri Research Scientist (CR), CNRS (HDR)
LEGRAS-LACHUER Catherine Lecturer (MCF), UCB
MAVINGUI Patrick Research Director (DR), CNRS
MINARD Guillaume Lecturer (MCF), UCB
POTIER Patrick Professor (PR), UCB
TRAN-VAN Van Engineer (IE), CNRS
VALIENTE-MORO Claire Lecturer (MCF), UCB
Personnels non permanents
DEMICHEL Colin PhD student (2017-2020)
ENGUELHARD Margot PhD student (2013-2016)
GUEGAN Morgane PhD student(2016-2019)
ZOUACHE Karima post-Doctoral fellow, UCB
Anciens membres
ACOSTA Erika PhD student, IPN Mexique
DOUAM Florian PhD student (2010-2013)
GONZALEZ Victor Chercheur invité UNAM Mexique
MAURIN Guillemette PhD student , ENS Lyon
RAHARIMALALA Fara PhD student , UCB et Université Antananarivo
RANCÈS Edwige PhD student , UCB
RAQUIN Vincent PhD student , UCB
RENÉ-MARTELLET Magalie PhD student , UCB VetAgro Sup
SAUCEREAU Yoann PhD student (2013-2016)
TRAN Florence Technician, CNRS
VORONIN Denis Postdoctorant, CNRS
ZOUACHE Karima PhD student , UCB

Infectious diseases are a global concern, since they remain the second leading cause of death worldwide, and induce annual loss of 40% of agricultural production. One of the major public health challenges is to provide methods to fight against the emergence and spreading of pathogenic infectious agents. Understanding which ecological factors are involved in the emergence may help to circumvent or at least reduce the infectious risks. We use as models the arboviruses (arthropod-borne viruses), including Chikungunya virus and Dengue virus, and the mosquito vector Aedes albopictus.

Until recently, the investigation of infectious diseases transmitted by vectors was essentially based on a vertical approach, bipartite, restricted to pathogen and its vector/reservoir or host. We are implementing a holistic approach that takes into account the different players (identity and density) and different levels (gene, molecular, cellular, individual and population) of interactions (Fig. 1). This systemic approach will help understanding at which levels of the pathogen-vector-symbiont-host interactions, anthropogenic factors and/or natural disturbance of the environment can lead to invasion and adaptation of vectors and generate the emergence and spreading of infectious agents.

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Fig. 1 : The mosquito holobiont in vectorial pathosystem

To conduct our research, we combine field surveys and experimental studies. We recently constructed an level 2 insectarium at La Doua Campus and we contributed to the implementation of level 3 insectarium at Gerland Campus (UMS 3444, Bioscience).

Our integrated approach can enable the development of innovative methods
respectful of environment.

Theme 1. Ecology and evolution of vectors and their microbiota

In the light of the recent theory of the holobiont unit, we hypothesize that bacterial microbiota could contribute to the adaptive potential of mosquitoes. To that end, we explore what are the genomic, microbiological and ecological bases behind the highly invasive behaviour and ecological plasticity of Ae. albopictus. Thus, we undertake (i) the sampling of mosquito-field populations from various geographic origins and (ii)
the comparative analysis of host genetic populations and their bacterial metagenomic (metataxogenomic and metatrancriptomic). In parallel, we perform experimental infections of mosquitoes to study the mosquito-bacterial partnership when faced abiotic and biotic factors.

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Fig. 2. Our study model : the tiger mosquito Aedes albopictus

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Fig.3. Breeding of Ae. albopictus in our level 2 insectary

Theme 2. Multipartite interactions and vector transmission

Our studies and those of other international research groups have shown that some bacterial taxa may interfere with the vector competence of arthropods. The most studied bacterium in mosquitoes is the alphaproteobacteria Wolbachia. However, molecular and cellular mechanisms involved in multipartite interactions remain largely unknown. Using our cellular model (Fig. 4), we perform global functional analysis (transcriptomic and proteomic of interactions) of the mosquito responses to multi-
infections (Fig. 5). These approaches will allow identifying certain determinants that could be tested in insecta and some being potential candidates for the development of innovative control strategies.

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Fig. 4. C636 cell line infected with Wolbachia (white arrows)

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Fig. 5. Comparative analysis

Keywords : Biodiversity, adaptation, invasion, ecology and health, infectious diseases, bio-phylo-geography, host-pathogen interactions, arboviroses, virus transmission, alphavirus (Chikungunya), flavivirus (Dengue), microbiota (microbiome), Wolbachia, metagenomics (bacteriome, virome), (meta)transcriptomics (symbionts, hosts), experimental evolution, extended phenotype, holobiont (hologenome), vectors, mosquitoes, Aedes albopictus.

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