The genomic survey of Tc1-like elements in the silkworm microsporidia Nosema bombycis

Abstract

Background

Microsporidia Nosema bombycis is the destructive pathogen in the production of sericulture. The Tc1/mariner elements belong to important component of DNA transposon.

Methods

The genomic data of N. bombycis and related Nosema species were screened to identify the Tc1-like elements and analyzed the phylogenetic relationship, based on bioinformational analysis. High-throughput data of transcriptomes and small RNAs were used to evaluate the expressed level and potential rasiRNAs for the Tc1-like elements of N. bombycis.

Results

Twelve complete Tc1-like elements belonging to DD34,E clade is confirmed in the whole genome of N. bombycis, and divided into two branches. Six of them are sole in N. bombycis and thereby would be the molecular marker to differentiate this species from others Nosema spp. Most of the elements have the transcriptional active and are the source of sRNAs.

Conclusion

Abundant Tc1-like elements in N. bombycis reflect the expansion of transposons for this genomic characters, comparing with others Nosema spp. The finding of distribution, phylogeny and potential functional activity for Tc1Nbs in N. bombycis will help understanding the role of the DNA transposon in genomic evolution of microsporidia.

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Acknowledgements

This study is supported by Natural Science Foundation Project of Chongqing Science and technology Commission (No. cstc2015jcyjA80020), and the earmarked fund for China Agriculture Research System (No. CARS-44-KXJ21).

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Correspondence to Xiaoyan Zhang.

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Song, H., Tang, X., Lan, L. et al. The genomic survey of Tc1-like elements in the silkworm microsporidia Nosema bombycis. Acta Parasit. 65, 193–202 (2020). https://doi.org/10.2478/s11686-019-00153-6

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Keywords

  • Microsporidia
  • Nosema bombycis
  • Tc1-like
  • Genome
  • Active