Preliminary analysis of miRNA pathway in Schistosoma mansoni

MS Gomes, FJ Cabral, LK Jannotti-Passos… - Parasitology …, 2009 - Elsevier
MS Gomes, FJ Cabral, LK Jannotti-Passos, O Carvalho, V Rodrigues, EH Baba, RG Sá
Parasitology international, 2009Elsevier
RNA silencing refers to a series of nuclear and cytoplasmatic processes involved in the post-
transcriptional regulation of gene expression or post-transcriptional gene silencing (PTGS),
either by sequence-specific mRNA degradation or by translational arrest. The best
characterized small RNAs are microRNAs (miRNAs), which predominantly perform gene
silencing through post-transcriptional mechanisms. In this work we used bioinformatic
approaches to identify the parasitic trematode Schistosoma mansoni sequences that are …
RNA silencing refers to a series of nuclear and cytoplasmatic processes involved in the post-transcriptional regulation of gene expression or post-transcriptional gene silencing (PTGS), either by sequence-specific mRNA degradation or by translational arrest. The best characterized small RNAs are microRNAs (miRNAs), which predominantly perform gene silencing through post-transcriptional mechanisms. In this work we used bioinformatic approaches to identify the parasitic trematode Schistosoma mansoni sequences that are similar to enzymes involved in the post-transcriptional gene silencing mediated by miRNA pathway. We used amino acid sequences of well-known proteins involved in the miRNA pathway against S. mansoni genome and transcriptome databases identifying a total of 13 putative proteins in the parasite. In addition, the transcript levels of SmDicer1 and SmAgo2/3/4 were identified by qRT-PCR using cercariae, adult worms, eggs and in vitro cultivated schistosomula. Our results showed that the SmDicer1 and SmAgo2/3/4 are differentially expressed during schistosomula development, suggesting that the miRNA pathway is regulated at the transcript level and therefore may control gene expression during the life cycle of S. mansoni.
Elsevier
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