How mRNA Surveillance Limits Virus Spread in Plants and Insects

Jim Crocker
14th June, 2024

How mRNA Surveillance Limits Virus Spread in Plants and Insects

Genetically modifying rice to either overexpress (a–c) or knock out (d, f, g) the OsPelo gene enhances resistance to southern rice black-streaked dwarf virus, leading to reduced disease symptoms and lower viral accumulation.

Image adapted from: Sun et al. / CC BY (Source)

Key Findings

  • Researchers at Fujian Agriculture and Forestry University studied the role of the Pelota (Pelo) protein in rice and its insect vector, the planthopper
  • The virus SRBSDV slightly reduces Pelo protein levels in infected rice and planthoppers, suggesting an interaction with the host's mRNA surveillance system
  • Manipulating Pelo expression in rice and insect cells inhibits the formation of viral structures, reducing the virus's ability to propagate
Plant viruses pose significant challenges to agriculture, often leading to substantial crop losses. Understanding how these viruses propagate and how plants can resist them is crucial for developing effective control strategies. A recent study conducted by researchers at Fujian Agriculture and Forestry University[1] sheds light on the role of the Pelota (Pelo) protein in the propagation of the fijivirus southern rice black-streaked dwarf virus (SRBSDV) in rice and its insect vector, the planthopper (Sogatella furcifera). Pelota is a conserved protein involved in the mRNA surveillance system, which monitors and maintains the quality of mRNA during translation, the process by which proteins are synthesized in cells. This protein has been previously studied in various organisms, including yeast and plants, for its role in ribosome rescue and cell cycle control[2][3]. In yeast, for example, the absence of Dom34, a protein related to Pelo, exacerbates growth defects when there is a shortage of 40S ribosomal subunits, highlighting its importance in maintaining ribosome function[2]. In this new study, researchers found that the accumulation of Pelo proteins slightly decreases during the propagation of SRBSDV in both rice and the planthopper vector. This observation is intriguing because it suggests a potential interaction between the virus and the host's mRNA surveillance machinery. The study identified that the tubular protein P7-1, encoded by SRBSDV, interacts with Pelo in both rice and planthoppers. This interaction appears to be critical for the virus's ability to form tubules, which are essential for its propagation. To further explore the role of Pelo in viral propagation, the researchers manipulated Pelo expression in both rice plants and insect cells. Overexpression or knockdown of Pelo inhibited the formation of P7-1 tubules in insect cells, thereby exerting antiviral activity. Similarly, in transgenic rice plants, altering Pelo expression levels inhibited the effective propagation of SRBSDV and two other rice viruses from different families. This suggests that Pelo plays a significant role in the host's antiviral response. The slight reduction in Pelo accumulation during SRBSDV propagation appears to be a viral strategy to avoid excessive inhibition of P7-1 tubule formation, ensuring effective virus propagation. This finding aligns with previous studies that have shown how viruses can manipulate host cellular machinery to facilitate their own replication and spread[4]. For instance, the choice of codons in mRNA can influence the rate of ribosome elongation and, consequently, mRNA stability and degradation, which are interconnected processes affecting protein output[4]. The insights gained from this study have significant implications for developing new strategies to enhance plant resistance to viruses. By understanding how Pelo expression can be modulated to inhibit viral propagation, researchers can potentially engineer crops with improved resistance to a broad spectrum of plant viruses. This approach could be a valuable addition to existing methods of crop protection, contributing to more sustainable agricultural practices. In conclusion, the study by Fujian Agriculture and Forestry University highlights the critical role of the Pelo protein in the propagation of SRBSDV in rice and its insect vector. By manipulating Pelo expression, it is possible to inhibit viral propagation, offering a promising strategy for enhancing plant resistance to viruses. This research builds on previous findings about the role of mRNA surveillance and ribosome function in cellular processes[2][3][4], providing a deeper understanding of the complex interactions between plant viruses and their hosts.

BiotechGeneticsPlant Science

References

Main Study

1) The mRNA surveillance factor Pelo restricts rice virus propagation in insect vectors and host plants

Published 13th June, 2024

https://doi.org/10.1186/s42483-024-00251-y

Related Studies

2) Why Dom34 stimulates growth of cells with defects of 40S ribosomal subunit biosynthesis.

https://doi.org/10.1128/MCB.00618-10

3) A Pelota-like gene regulates root development and defence responses in rice.

https://doi.org/10.1093/aob/mcy075

4) When mRNA translation meets decay.

https://doi.org/10.1042/BST20160243


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