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| Author(s): |
Natália Melquie Monteiro Teles
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Ribeirão Preto. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina de Ribeirão Preto (PCARP/BC) |
| Defense date: | 2019-05-22 |
| Examining board members: |
Angela Kaysel Cruz;
Daniella Castanheira Bartholomeu;
Maria Luisa Paçó Larson;
Lucile Maria Floeter Winter
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| Advisor: | Angela Kaysel Cruz |
| Abstract | |
Leishmania is a genus of trypanosomatid protozoan parasites, causative agents of leishmaniases. Viannia sub-genera species as Leishmania (Viannia) braziliensis are the causative agents of cutaneous and muco-cutaneous leishmaniasis in Central and South America. The gene expression in this parasites is regulated via post-transcriptional mecanisms comprising the action of cis and trans regulatory elements and RNA binding proteins. In this context, non coding RNAs poorly explored as putative factors involved in regulation of gene expression in Leishmania must be investigated. In this study the transcriptome of coding and ncRNAs of L. braziliensis were analysed. Differential expression analysis, including gene ontology enrichment analysis, during the parasite development revealed the expected paterns for gene expression in Leishamnia spp. A comparative analysis, considering up-regulated genes suggested a contribution of paralogues genes to diversity between Leishmania. spp. To uncover putative ncRNAs, a computational pipeline was previous designed identifying and characterizing 11,372 putative ncRNAs in L. braziliensis, allowing a classification into different ncRNAs classes. The differential expression analysis revealed similar patterns to those observed for protein coding genes. Thirty-five putative ncRNAs were categorized, selected and subjected to Northern blotting being 6 of them selected to functional analysis. These selected group was investigated conducting and stablishing knockout lines, that revealed phenotypic differences concerning diminishing in promastigote growth and in vitro macrophage infection, suggesting possible functional roles of ncRNAs in L. braziliensis. Finnaly, the protein interactions of these ncRNAs were revealed and must be explored in the future to uncover possible regulatory roles of this ncRNAs until now, putative in L. braziliensis. This work represents an outline of L. braziliensis transcriptome contributing to improve the understanding of coding and noncoding RNA content in the parasite (AU) | |
| FAPESP's process: | 15/16684-1 - Investigation of non coding RNAs in Leishmania (Viannia) braziliensis |
| Grantee: | Natália Melquie Monteiro Teles |
| Support Opportunities: | Scholarships in Brazil - Doctorate |