MicroRNAome of Spodoptera frugiperda in Response to SfMNPV Infection

Spodoptera frugiperda, a significant agricultural pest, has been the subject of research examining its resistance to insecticides and the potential for biocontrol methods. One such approach involves the use of Spodoptera frugiperda Multiple Nucleopolyhedrovirus (SfMNPV), a natural pathogen. A study on this topic involved comparing the small RNA-seq profiles of uninfected larvae and infected larvae to identify microRNAs (miRNAs) and uncover their roles in the infection process.

The research revealed a variety of known and potentially novel miRNAs present in S. frugiperda, some of which were found in clusters. Among the results, 13 miRNAs were determined to be differentially expressed (DE) between infected and uninfected larvae, with two of these being novel miRNAs identified in this study. By predicting the targets of these miRNAs, researchers found associations with various biological processes known to be relevant to the infection, including processes related to proliferation, apoptosis, cell cycle regulation, autophagy, DNA damage response, vesicle transport, cytoskeleton remodeling, signaling pathways such as JAK/STAT and Toll, and immune response activation.

Furthermore, several of these putative targets were identified as hub genes within a predicted protein-protein interaction network. Additionally, the study found that some DE miRNAs may play a role in regulating viral gene expression, potentially modulating the infection process. These findings contribute to a deeper understanding of the miRNA landscape in Spodoptera frugiperda and its potential role in mediating the effects of SfMNPV infection.