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Small nucleolar RNA interference induced by antisense or double-stranded RNA in trypanosomatids
Xue-Hai Liang1, Qing Liu, Shulamit Michaeli
1Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel.
Summary
Small nucleolar RNAs (snoRNAs) in trypanosomes can be silenced using RNA interference. This process degrades mature snoRNAs, impacting essential 2'-O-methylation, and offers insights into nucleolar RNA function.
Area of Science:
- Molecular Biology
- Genetics
- Parasitology
Background:
- Small nucleolar RNAs (snoRNAs) in trypanosomes are clustered and repeated.
- They are transcribed as polycistronic transcripts and processed into mature forms.
Purpose of the Study:
- To investigate the silencing of snoRNA genes in three trypanosomatid species.
- To explore the role of RNA interference in snoRNA regulation.
Main Methods:
- Gene silencing using antisense transcripts in *Leptomonas collosoma* and *Leishmania major*.
- Inducible double-stranded RNA synthesis in *Trypanosoma brucei*.
- Analysis of mature snoRNA levels, precursor RNAs, and 2 -O-methylation.
Main Results:
- Successful silencing of snoRNA genes in all three species.
- Silencing led to the accumulation of small interfering RNA (siRNA).
- Mature snoRNAs were eliminated, but precursors remained; specific 2 -O-methylation was abolished.
Conclusions:
- RNA interference can effectively degrade snoRNAs in trypanosomes.
- This study provides evidence for RNAi-mediated degradation of snoRNAs.
- Findings contribute to understanding nucleolar RNA function and modifications in eukaryotes.