microRNAs in cestode parasites

CUCHER, M.; KAMENETZKY, L.; PRADA, L.; MACCHIAROLI, N.; KISS, F.; ASURMENDI, S.; BREHM, K.; ROSENZVIT, M.

Congreso; XLVIII Reunión Anual de la Sociedad Argentina de Investigación Bioquímica y Biología; 2012

Objective: Echinococcus spp are endemic cestode parasites of sanitary importance and constitute an interesting model for developmentalstudies. Our objective is to study the mechanisms of development of Echinococcus spp focusing on the role of small RNAs, in particularmicroRNAs (miRNAs), in this process.Methodology and results: We showed the presence of miRNAs in E. granulosus by construction and bioinformatic analysis of a small RNAs libraryand Northern blot validation. According to homology and RT-PCR analyses, these miRNAs are also present in E. multilocularis. Furthermore, wefound miRNAs stage specific expression, suggesting they play a role in development. We also analyzed the possible miRNAs´ target genes bymiRNA binding sites prediction and observed that they would be involved in the regulation of development, homeostasis and host-parasiteinteraction. We also identified the miRNA biogenesis machinery components in Echinococcus spp. genomes by in silico analyses and foundAgo proteins specific for parasitic flatworms.Conclusions: Gene expression regulation by miRNAs opens a new field to study the molecular bases of development of parasite cestodes,which is of main importance in biomedicine. Now, we are designing high throughput strategies to analyse the complete repertoire of smallRNAs and also silencing protocols to analyse their role in development.