[Publication]

Les derniers travaux de Rania Najm, Hiba El Hajj, Maryse Lebrun & leurs collègues sont publiés dans PNAS. Les auteurs apportent des connaissances importantes sur les acteurs moléculaires de l'invasion des bradyzoïtes et développent une stratégie vaccinale ciblant l'invasion des bradyzoïtes et des tachyzoites de Toxoplasma gondii.

Travaux publiés dans PNAS : Najm, R., Ruivo, M.T.G., Penarete-Vargas, D.M., Hamie, M., Mouveaux, T., Gissot, M., Boulanger, M.J., El Hajj, H., Lebrun, M., (2023). Invasion of Toxoplasma gondii bradyzoites: Molecular dissection of the moving junction proteins and effective vaccination targets. Proceedings of the National Academy of Sciences 120, e2219533120. doi: 10.1073/pnas.2219533120.

LabEx ParaFrap wishes you happiness, health, science and success for 2023.

First news from the network this year: the ParaFrap webinars will be back in 2023, as in previous years, every second Thursday of the month at 3pm. If you are not yet on the webinar mailing list to receive all the information, sign up.

[Communiqué]

Gerald Spaeth, head of the "Molecular Parasitology and Signalling" unit at the Institut Pasteur Paris, has been awarded a Synergy grant from the European Research Council (ERC) for the project "DECOLeishRN - Decoding epistatic genome/RNome interactions in ekaryotic fitness gain using Leishmania parasites as a unique model system". This project is funded at over 9 millions Euros and will be conducted in collaboration with two Israeli teams led by Shulamit Michaeli (Bar-Ilan University) and Yitzhak Pilpel (Weizmann Institute of Science).

Exploiting the unique biology of the protozoan parasite Leishmania as a model system, the project will generate unprecedented insight into the role of genome instability in eukaryotic adaptation by combining experimental evolution, analyses of the non-coding RNA, network modelling and cutting-edge, single cell sequencing. The project aims to uncover the molecular filter that can mitigate toxic effects of genome instability while promoting beneficial ones, thus resolving a long-standing question in infection and cancer biology.

The six-year project (2023-2029) is poised to reveal complex and dynamic interactions between genomic, epitranscriptomic and phenotypic adaptation of these important parasites, and the role of stress-adapted ribosomes and non-coding RNAs – especially anti-sense regulators – that compensate for detrimental gene dosage changes. The scientists will further examine whether the parasite has the capacity to predict and prepare in advance to changes in environmental conditions and the switch between its hosts. The study of pathogen evolution within a mammalian host will provide an innovative framework for the discovery of complex biomarker candidates linked to Leishmania virulence and drug resistance. Exploiting genome instability for adaptation is common to other diseases-causing microbes and cancer. This ERC Synergy grant will thus deliver a blueprint to study how chaotic genome instability is harnessed for adaptation and to escape unfavorable environmental conditions.

[Communiqué]

The team of Dr Chetan Chitnis from the Institut Pasteur, a partner in LabEx ParaFrap, has studied the blood stage of the Plasmodium falciparum parasite, which causes the most severe and deadly form of malaria, and discovered a mechanism that could lead to the development of new effective drugs against malaria. The results of this study were published in a communication of Institut Pasteur.

Work published in Cell Reports : Matthias Paulus Wagner, Pauline Formaglio, Olivier Gorgette, Jerzy Michal Dziekan, Christèle Huon, Isabell Berneburg, Stefan Rahlfs, Jean-Christophe Barale, Sheldon I. Feinstein, Aron B. Fisher, Didier Ménard, Zbynek Bozdech, Rogerio Amino, Lhousseine Touqui, Chetan E. Chitnis (2022) Human peroxiredoxin 6 is essential for malaria parasites and provides a host-based drug target. Cell Reports, Volume 39, Issue 11. doi: 10.1016/j.celrep.2022.110923.