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Different Types of Small RNAs in Protozoa

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Non-coding RNAs and Inter-kingdom Communication

Abstract

The origin and evolution of small RNA molecules is a long-standing mystery. The protozoa represent the earliest eukaryotes and encompass rich diverse genetic resources. However, there are many contradictions and disputes prevalent in studies on protozoan microRNAs. In this review, we summarize the research on the analysis of small RNA transcriptome data on two representative protozoans, Trypanosoma brucei and Giardia lamblia , as generated by high throughput sequencing. The results show that these protozoans do not have canonical miRNAs. Unexpectedly, there are many types of endogenous small interfering RNAs (endo-siRNAs). In addition, stress induced tRNA derived small RNAs (sitRNAs) were observed in different life cycle stages of these parasites. In total, there are six kinds of sitRNAs in G. lamblia . These small RNAs are then found to be involved in the differentiation processes of primitive eukaryotes . These results showed that systematic analysis of small RNAs in the protozoa revealed a more complex picture than previously thought.

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Acknowledgments

This work was supported by the grants from Ministry of Science and Technology of China; National Basic Research Program (No. 2011CB811300) from the National Basic Research program (“973” program) to L.-H.Q.; grants from the National Natural Science Foundation of China: 31401975 (to L.-L.Z.), 31401092 (to J.-Y.L.), 31301876 (to Y.-Z.W.), 31272305 and 31472058 (to Z.-R.L.) and 31471223 (to L.-H.Q.), and grants from Natural Science Foundation of Guangdong Province 2014A030313175 (to J.-Y.L.) and 2015A030311042 (to Z.-R.L). This was also supported in part by the Guangdong Province Key Laboratory of Computational Science and the Guangdong Province Computational Science Innovative Research Team. The authors declare no conflict of interest.

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Correspondence to Liang-Hu Qu or Zhao-Rong Lun .

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© 2016 Springer International Publishing Switzerland

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Zheng, LL., Liao, JY., Wen, YZ., Hide, G., Qu, LH., Lun, ZR. (2016). Different Types of Small RNAs in Protozoa. In: Leitão, A., Enguita, F. (eds) Non-coding RNAs and Inter-kingdom Communication. Springer, Cham. https://doi.org/10.1007/978-3-319-39496-1_11

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