Project description:Nested parasitic chains are common schemes in nature, not limited to cellular organisms. Some giant viruses infecting protists are hyperparasitized by smaller viruses named virophages. Both can carry episomal plasmid-like DNA molecules known as transpovirons in their particles. They all share common transcriptional regulatory elements dictating the expression of their genes, which are transcribed within viral factories built by giant viruses in the host cytoplasm. This suggests close but as yet undetermined interactions between their respective transcriptional networks. Here, we studied the protein content of Megavirus chilensis virions produced in Acanthamoeba castellanii cells co-infected or not with the virophage Zamilon vitis.
2024-09-03 | PXD052049 | Pride
Project description:Megavirus vitis, zamilon vitis and megavirus vitis transpoviron long read sequencing
Project description:Primary objectives: The primary objective is to investigate circulating tumor DNA (ctDNA) via deep sequencing for mutation detection and by whole genome sequencing for copy number analyses before start (baseline) with regorafenib and at defined time points during administration of regorafenib for treatment efficacy in colorectal cancer patients in terms of overall survival (OS).
Primary endpoints: circulating tumor DNA (ctDNA) via deep sequencing for mutation detection and by whole genome sequencing for copy number analyses before start (baseline) with regorafenib and at defined time points during administration of regorafenib for treatment efficacy in colorectal cancer patients in terms of overall survival (OS).
Project description:We applied the RNA-Seq approach to reconstruct the transcriptome of Vitis vinifera cv. Corvina, using RNA pooled from a comprehensive set of sampled tissues in different organs and development steps, and we were able to reconstruct some novel and putative private Corvina genes. We analyzed the expression of these genes in three berry developmental conditions, and posit that they may play some role in the formation of the mature organ. Background: Plants display a high genetic and phenotypic variability among different cultivars. Understanding the genetic components that contribute to phenotypic diversity is necessary to disentangle genetic factors from the environment. Given the high degree of genetic diversity among plant cultivars a whole-genome sequencing and re-annotation of each variety is required but a reliable genome assembly is hindered by the high heterozigosity and sequence divergence. Results: we show the feasibility of an approach based on sequencing of cDNA by RNA-Seq to analyze varietal diversity between a local grape cultivar Corvina and the PN40024 grape reference genome. We detected 15,260 known genes and we annotated alternative splicing isoforms for 9,463 genes. Our approach allowed to define 2,321 protein coding putative novel genes in unannotated or unassembled regions of the reference genome PN40024 and 180 putative private Corvina genes whose sequence is not shared with the reference genome. Conclusions: With a de novo assembly based approach we were able to reconstruct a substantial part of the Corvina transcriptome and we improved substantially known genes annotations by better defining the structure of known genes, annotating splicing isoforms and detecting unannotated genes. Moreover our results clearly define sets of private genes which are likely part of the âdispensableâ genome and potentially involved into influencing some cultivar-specific characteristics. In plant biology a transcriptome de novo assembly approach should not be limited to species where no reference genome is available as it can improve the annotation lead to the identification of genes peculiar of a cultivar.
Project description:Mimivirus 1.2Mb genome is organized into a 30 nm nucleocapsid-like structure made of two closely related GMC-oxidoreductases, also composing the fibrils decorating its virions. In this work, we used MS-proteomics to characterize the protein content of virions and fibrils from different members of the Mimiviridae family (clade A: Mimivirus reunion -Mr- and Mimivirus M4 -M4, clade B: Moumouvirus australiensis -Ma- and Moumouvirus maliensis -Mm, clade C: Megavirus chilensis -Mc- and Megavirus vitis -Mv). Furthermore, we analyzed fractions purified from Mr mutants devoid of one of the two GMC-oxidoreductases (Mr_KOqu_143 and Mr_KOqu_946), or of both GMC-oxidoreductases (Mr_2KO) with or without expression of the GFP fused to the N-terminus of one GMC-oxidoreductase (Mr_2KO-GFP). Our results show the versatility of the protein content of the fibrils, with fibrils composed of different proteins inter- and even intra-clade, clades B and C viruses presenting fibrils with a protein composition closer to each other than that of clade A viruses.