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Identification of SL addition trans-splicing acceptor sites in the internal transcribed spacer I region of pre-rRNA in Leishmania (Leishmania) amazonensis

By Mario Gustavo Mayer and Lucile Maria Floeter-Winter


Trypanosomatidae is a family of early branching eukaryotes harbouring a distinctive repertoire of gene expression strategies. Functional mature messenger RNA is generated via the trans-splicing and polyadenylation processing of constitutively transcribed polycistronic units. Recently, trans-splicing of pre-small subunit ribosomal RNA in the 5' external transcribed spacer region and of precursor tRNAsec have been described. Here, we used a previously validated semi-nested reverse transcription-polymerase chain reaction strategy to investigate internal transcribed spacer (ITS) I acceptor sites in total RNA from Leishmania (Leishmania) amazonensis. Two distinct spliced leader-containing RNAs were detected indicating that trans-splicing reactions occur at two AG acceptor sites mapped in this ITS region. These data provide further evidence of the wide spectrum of RNA molecules that act as trans-splicing acceptors in trypanosomatids

Topics: RNA polymerase I, spliced leader RNA, spliceosome, Microbiology, QR1-502, Science, Q, Arctic medicine. Tropical medicine, RC955-962, Special situations and conditions, RC952-1245, Internal medicine, RC31-1245, Medicine, R
Publisher: Instituto Oswaldo Cruz, Ministério da Saúde
Year: 2012
DOI identifier: 10.1590/S0074-02762012000800019
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