Project description:Mimivirus is the prototype of the Mimiviridae family of giant dsDNA viruses, initially isolated in Acanthamoeba. Little is known about the organization of the viral genome inside the membrane limited nucleoid and whether unpacking or other rearrangements are required prior to early transcription and replication. Here we used Mimivirus reunion (an isolate from La Réunion Island) and showed that in vitro opening of its large icosahedral capsid leads to the release of electron dense, 30 nm diameter rod-shaped objects that appear to be expelled and unwinding from the particles. We developed a purification procedure and performed a mass spectrometry-based characterization of the protein content of the genomic fibre, as well as total virion.
Project description:Genomic changes associated with resistance to the pyrethroid insecticide deltamethrin were investigated between six mosquito lines all originating from La Reunion Island. Two of these 6 lines, Sel and NS, derived from the same composite population made by pooling six distinct field populations from La Reunion Island: in the lab, the Sel line was subjected to deltamethrin selection for five successive generations at the adult stage while the NS line was maintained without selection. Three lines correspond to field populations collected in 2018-2029 in three distinct localities (SL: Saint-Louis, SP: Saint Pierre, SS: Sainte-Suzanne. Finally, the susceptible line SRun originating collected in the early 2000s from La Réunion island and maintained in the laboratory since then was also used as a reference.