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Leishmania braziliensis guyanensis

ABSTRACT: Leishmania braziliensis strain 2700 small RNA

PROVIDER: PRJNA335424 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR3975552.fastq.gz	Fastqsanger.gz
	SRR3975543.fastq.gz	Fastqsanger.gz
	SRR3975553.fastq.gz	Fastqsanger.gz
	SRR3975544.fastq.gz	Fastqsanger.gz
	SRR3975545.fastq.gz	Fastqsanger.gz

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Leishmania braziliensis

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Project description:The main objective of this study is to identify the list of genes differentially expressed between infected with Leishmania braziliensis and non-infected macrophage cultures based on gene expression microarray profiling The dataset is comprised by the expression profile of 6 samples from three independent experiments and each experiment had three technical replicates. 3 of the 6 samples were U937 derived macrophages infected by Leishmania braziliensis and the other 3 were U937 derived macrophages without infection with Leishmania braziliensis. A total of 18 microarrays analysis were performed.

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Project description:We functionally characterized the five predicted PRMTs in Leishmania braziliensis by gene knockout and endogenous protein HA tagging using CRISPR/Cas9 gene editing. We report that R-methylation profiles vary among Leishmania species and across L. braziliensis lifecycle stages, with the peak PRMT expression occurring in promastigotes. A list of PRMT-interacting proteins was obtained in a single coimmunoprecipitation assay using HA-tagged PRMTs, suggesting a network of putative targets of PRMTs and cooperation between the R-methylation writers. Knockout of each L. braziliensis PRMT led to significant changes in global arginine methylation patterns without affecting cell viability. Deletion of either PRMT1 or PRMT3 disrupted most type I PRMT activity, resulting in a global increase in monomethyl arginine levels. Using anti-MMA antibodies, we performed an IP experiment to identify MMA proteins in the parental line, single PRMT1 knockout, PRMT1/PRMT7 double knockout and PRMT1-Addback parasites. The results indicate that R-methylation is modulated across lifecycle stages in L. braziliensis and show possible functional overlap and cooperation among the different PRMTs in targeting proteins. Overall, our data suggest important regulatory roles of these proteins throughout the L. braziliensis life cycle, showing that arginine methylation is important for parasite-host cell interactions. Linked publication: https://doi.org/10.1101/2021.09.22.461376.

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CD8 T cells induce perforin-dependent pathology in Leishmania braziliensis infection

Project description:The mechanisms that mediate immunopathologic responses in infectious diseases are often less well understood than how the pathogens are controlled. Here, we have investigated what causes increased pathology following infection with the protozoan parasite, Leishmania braziliensis. We focused on CD8 T cells since their presence in leishmanial lesions has been correlated with increased disease. By adoptively transferring CD8 T cells to L. braziliensis infected RAG mice, we found that unregulated CD8 T cells promote severe pathology at the infection site, as well as the development of metastatic lesions in other skin sites. In mice with severe pathology, we visualized CD8 T cells degranulating and lysing L. braziliensis infected cells, and in parallel studies with L. braziliensis patients we confirmed that CD8 T cells within lesions exhibit a cytolytic phenotype. We found that perforin deficient CD8 T cells failed to induce disease, indicating that the increased disease induced by CD8 T cells was due perforin-dependent cytotoxicity. In contrast, although we found that CD8 T cells made both IFN-γ and IL-17, neither of these cytokines is required for the development of pathology. Thus, we show for the first time that immunopathology in leishmaniasis can be mediated by cytolytic CD8 T cells. Twelve skin biopsy samples were analyzed, including 2 normal skin biopsies obtained from patients in N. America, and 10 skin biosies obtained from Leishmania brazilensis infected patients presenting at the Corte de Pedra Health Post in Corte de Pedra, Bahia, Brazil

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