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Dernière mise à jour : Mai 2018

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Maria Bogaerts Marquez


Courriel : maria.bogaerts-marquez(at)
Sujet : Transposable elements in the invasive species Harmonia axyridis
Dates : 1er mars 2022 – 29 février 2024
Responsables CBGP : M. Gautier & A. Estoup 

Au cours de ce postdoc, Maria étudiera comment des éléments transposables ont pu intervenir dans l'adaptation d'Harmonia axyridis aux différentes vois d'invasion.

Le post-doctorat de Maria s’inscrit dans le cadre du projet ANR GANDHI porté par Arnaud Estoup (2021-2024) qui vise à caractériser les déterminants génomiques ayant favorisé l’invasion des populations de la coccinelle asiatique Harmonia axyridis sur une échelle mondiale. Il s’articulera plus spécifiquement autour de la caractérisation des variants structuraux et surtout des éléments transposables (ET) à partir de différents assemblages du génome de H. axyridis de haute qualité obtenus avec des séquences long-fragments (au moins 6 disponibles dont trois à une résolution chromosomique).

Il s’agira ensuite de comparer le contenu de différentes populations selon leur origine (aire native/aire envahie) à partir de données Pool-Seq disponibles ou en cours de production (une vingtaine de populations au total). Un des objectifs de cette étude est d’évaluer si le patron (que nous avons récemment observé chez D. suzukii) d’une augmentation du fardeau chez les populations invasives se retrouve chez H. axyridis, ce qui confirmerait l’importance de ce type de variants dans les processus invasifs.

En parallèle de ces analyses, des approches plus classiques d’inférence de l’histoire démographique (reconstruction des routes d’invasion avec des graphes d’admixture) et adaptative (recherche de signature sélection et analyse d’associations) des populations de H. axyridis seront aussi explorées en utilisant les données Pool-Seq mentionnées ci-dessus.