An efficient method for multigene co-interference by recombinant Bombyx mori nucleopolyhedrovirus

Abstract

Bombyx mori Nucleopolyhedrovirus (BmNPV), which is a member of the Baculoviridae family, is a significant pathogen of the silkworm. The infection of BmNPV is often lethal and causes about 20% loss of cocoon in the silk industry annually. To explore the effects of different gene inhibition strategies on the replication cycle of baculovirus, we constructed the mutant virus to infect BmN cells directly and further identified ie0, ie1, and gp64 as the essential viral genes of BmNPV. To elucidate the significance of the inhibition effect of different interference strategies, we characterized and constructed the recombinant BmNPV that carried a single or multigene-interfering cassette. The results showed that the inhibition effect of dsie1 on target gene expression, virus titer, and silkworm mortality was significantly better than that of dsie0 and dsgp64. It also showed that the dsie1 interference produced fewer progeny virions and was less lethal, which indicates that ie1 played a more critical role in the BmNPV replication cycle. Furthermore, the inhibitory effect of the virus titer and mortality indicated that the multigene co-interference constructed by the baculovirus expression system was significantly better than the interference of any single-gene (p < 0.05). In summary, the strategy of multigene synergy can achieve the function of continuous interference and provide a new platform for the breeding of silkworm disease resistant. In addition, this strategy improves the various traits of the silkworm.

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Acknowledgements

This study was funded by the National Natural Science Foundation of China (Grant Nos. 31872426, 31372373), the Natural Science Foundation of Guangdong Province, China (Grant No. 2016A030311018).

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HZ and JS (J Sun) coordinated the project. HZ and FR performed the research. HZ JS (J Song) and JS (J Sun) wrote the manuscript. QL and JS (J Sun) contributed new methods and improved the manuscript. QL, ZC, and MF performed the data analysis. HZ, JL, and JS (J Sun) interpreted the context of results. All authors have read and approved the manuscript.

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Correspondence to Min Feng or Jingchen Sun.

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All authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Communicated by S. Hohmann.

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Zheng, H., Ren, F., Lu, Q. et al. An efficient method for multigene co-interference by recombinant Bombyx mori nucleopolyhedrovirus. Mol Genet Genomics 294, 111–120 (2019). https://doi.org/10.1007/s00438-018-1491-9

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Keywords

  • Bombyx mori
  • Nucleopolyhedrovirus
  • Multigene
  • Co-interference
  • Gene expression