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Molecular characterization and functional analysis of USP-1 by RNA interference in the Asian gypsy moth Lymantria dispar

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Abstract

Ecdysteroids play an important role in regulating diverse physiological processes in arthropods, such as molting, metamorphosis, reproduction and diapause. Ecdysteroids mediate the response by binding to a heterodimeric complex of two nuclear receptors: the ecdysone receptor and the ultraspiracle (USP). To investigate the role of USP in development of the Asian gypsy moth (Lymantria dispar), a USP cDNA was obtained from the transcriptome of L. dispar and verified by PCR. In-depth profiling of transcript levels of L. dispar USP-1 (LdUSP-1) at different developmental stages and over time in third-instar larvae and different tissues isolated during the third-instar stage of L. dispar was then carried out. Transcript levels of LdUSP-1 were relatively high before 72 h in the third-instar larvae after ecdysis and in the adult male. The function of LdUSP-1 in molting was analyzed by knockdown of LdUSP-1 in third instar larvae using RNA interference. Silencing of LdUSP-1 significantly downregulated the transcript level of E75, an ecdysone-inducible gene, and of Sad, a Halloween gene. In addition, the duration of the third-instar stage was slightly shortened and larval mortality increased after the LdUSP-1 knockdown.

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Acknowledgements

This research was supported by Grants from the Natural Science Foundation of China (31770688), the Fundamental Research Funds for the Central Universities (2572017AA17), the Ph.D. Programs Foundation of HeZe University (XY18BS06), and the Ph.D. Programs Foundation of HeZe University (XY18BS05).

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Author notes

  1. Rongrong Wen, Qingquan Zhao, and Buyong Wang have contributed equally to this work.

Authors and Affiliations

  1. School of Forestry, Northeast Forestry University, Harbin, 150040, People’s Republic of China

    Rongrong Wen, Qingquan Zhao & Ling Ma

  2. College of Agricultural and Biological Engineering, Heze University, Heze, 274015, People’s Republic of China

    Rongrong Wen & Buyong Wang

  3. College of Management, Harbin University of Commerce, Harbin, 150028, People’s Republic of China

    Yan Ma

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  1. Rongrong Wen
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  2. Qingquan Zhao
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  4. Yan Ma
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  5. Ling Ma
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Correspondence to Ling Ma.

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Project funding: This research was supported by Grants from the Natural Science Foundation of China (31770688), the Fundamental Research Funds for the Central Universities (2572017AA17), the Ph.D. Programs Foundation of HeZe University (XY18BS06), and the Ph.D. Programs Foundation of HeZe University (XY18BS05).

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Corresponding editor: Chai Ruihai.

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Wen, R., Zhao, Q., Wang, B. et al. Molecular characterization and functional analysis of USP-1 by RNA interference in the Asian gypsy moth Lymantria dispar. J. For. Res. 31, 1923–1931 (2020). https://doi.org/10.1007/s11676-019-00944-7

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