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Enhancing RNAi by using concatemerized double-stranded RNA.

Gaddelapati Sharath Chandra1, Ramaswamy Asokan1, Maligeppagol Manamohan1

  • 1Division of Biotechnology, Indian Institute of Horticultural Research (IIHR), Hesaraghatta Lake (PO), Bengaluru, India.

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|July 25, 2018
PubMed
Summary
This summary is machine-generated.

Concatemerized double-stranded RNA (dsRNA) significantly enhances RNA interference (RNAi) efficiency in the diamondback moth, Plutella xylostella. This method offers a more effective strategy for insect pest management compared to traditional dsRNA approaches.

Keywords:
Plutella xylostellaRNA interferenceRNAi pathway genesacetylcholinesterasedsRNA concatemers

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Area of Science:

  • Molecular Biology
  • Entomology
  • Pest Management

Background:

  • RNA interference (RNAi) is a valuable tool for gene function studies and insect pest control.
  • RNAi efficiency varies across insect species, often showing lower efficacy in lepidopteran insects.
  • Developing strategies to improve RNAi efficacy is crucial for its practical application.

Purpose of the Study:

  • To investigate the potential of concatemerized short double-stranded RNA (C-dsRNA) in enhancing RNAi efficiency.
  • To compare the effectiveness of C-dsRNA with non-concatemerized long dsRNA (NCL-dsRNA) in silencing the acetylcholinesterase (AChE) gene in Plutella xylostella.
  • To assess the impact of C-dsRNA on larval growth and mortality.

Main Methods:

  • Synthesized and applied C-dsRNA and NCL-dsRNA targeting the AChE gene in Plutella xylostella.
  • Quantified target gene silencing and measured larval weight gain and mortality.
  • Assessed the expression levels of core RNAi pathway genes, Dicer-2 and Argonaute-2 (Ago-2).

Main Results:

  • C-dsRNA significantly improved RNAi efficiency, leading to higher AChE gene silencing compared to NCL-dsRNA.
  • Lower concentrations of C-dsRNA (0.5 µg) achieved comparable results to higher concentrations of NCL-dsRNA (2 µg).
  • Enhanced RNAi correlated with increased expression of Dicer-2 and Ago-2, key regulators of the RNAi pathway.

Conclusions:

  • Concatemerized dsRNA (C-dsRNA) represents an advancement over routinely used long dsRNA for RNAi applications in Plutella xylostella.
  • This strategy holds promise for developing more effective methods for managing insect pests.
  • The findings contribute to optimizing RNAi technology for agricultural applications.