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Genome-wide investigation of transcription factors provides insights into transcriptional regulation in Plutella xylostella

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Abstract

Transcription factors (TFs), which play a vital role in regulating gene expression, are prevalent in all organisms and characterization of them may provide important clues for understanding regulation in vivo. The present study reports a genome-wide investigation of TFs in the diamondback moth, Plutella xylostella (L.), a worldwide pest of crucifers. A total of 940 TFs distributed among 133 families were identified. Phylogenetic analysis of insect species showed that some of these families were found to have expanded during the evolution of P. xylostella or Lepidoptera. RNA-seq analysis showed that some of the TF families, such as zinc fingers, homeobox, bZIP, bHLH, and MADF_DNA_bdg genes, were highly expressed in certain tissues including midgut, salivary glands, fat body, and hemocytes, with an obvious sex-biased expression pattern. In addition, a number of TFs showed significant differences in expression between insecticide susceptible and resistant strains, suggesting that these TFs play a role in regulating genes related to insecticide resistance. Finally, we identified an expansion of the HOX cluster in Lepidoptera, which might be related to Lepidoptera-specific evolution. Knockout of this cluster using CRISPR/Cas9 showed that the egg cannot hatch, indicating that this cluster may be related to egg development and maturation. This is the first comprehensive study on identifying and characterizing TFs in P. xylostella. Our results suggest that some TF families are expanded in the P. xylostella genome, and these TFs may have important biological roles in growth, development, sexual dimorphism, and resistance to insecticides. The present work provides a solid foundation for understanding regulation via TFs in P. xylostella and insights into the evolution of the P. xylostella genome.

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Funding

This work was funded by the National Natural Science Foundation of China (Grant numbers 31230061 and 31320103922) and Fujian Provincial Key Project of Agricultural Science and Technology (2018NZ01010013).

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QZ designed and performed the genome-wide analyses, interpreted the data, and drafted the manuscript. DM and YH helped to collect the data and performed the experiment validation. WH and WZ provided advice for the data analysis. LV and DM provided help in the data analysis and revised the manuscript. MY supervised the study. QZ and LV critically revised the manuscript. All authors read and approved the final manuscript.

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Correspondence to Minsheng You.

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P. xylostella is not protected under any legislation in China since it is considered as pests, no permit for specimen collection and animal care clearance were required.

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Communicated by S. Hohmann.

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Zhao, Q., Ma, D., Huang, Y. et al. Genome-wide investigation of transcription factors provides insights into transcriptional regulation in Plutella xylostella . Mol Genet Genomics 293, 435–449 (2018). https://doi.org/10.1007/s00438-017-1389-y

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