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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
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RNA Interference01:23

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RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
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Chitosan/Interfering RNA Nanoparticle Mediated Gene Silencing in Disease Vector Mosquito Larvae
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Inducing RNA interference in the arbovirus vector, Culicoides sonorensis.

M K Mills1, D Nayduch, K Michel

  • 1Division of Biology, Kansas State University, Manhattan, KS, USA.

Insect Molecular Biology
|October 9, 2014
PubMed
Summary

RNA interference (RNAi) is now a viable research tool for adult biting midges (Culicoides sonorensis). This breakthrough enables new studies into how these important arbovirus vectors transmit diseases.

Keywords:
biting midgeorbivirusreverse geneticsvector-borne disease

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Area of Science:

  • Entomology
  • Molecular Biology
  • Vector-borne Diseases

Background:

  • Biting midges (Culicoides spp.) are significant vectors of economically impactful arboviruses globally.
  • Research on Culicoides vectors is limited by a lack of genomic data and molecular tools like RNA interference (RNAi).

Purpose of the Study:

  • To establish RNA interference (RNAi) as a functional research tool in adult Culicoides sonorensis.
  • To investigate the feasibility of using dsRNA injection for gene knockdown in adult midges.

Main Methods:

  • Transcriptome analysis to identify RNAi pathway components.
  • Injection of double-stranded RNA (dsRNA) targeting green fluorescent protein (dsGFP) as a control.
  • Injection of dsRNA targeting the Culicoides sonorensis inhibitor of apoptosis protein 1 (CsIAP1) gene.
  • Monitoring of transcript levels and median survival rates post-injection.

Main Results:

  • Successful establishment of RNAi in adult C. sonorensis.
  • Injection of dsRNA targeting CsIAP1 led to a 40% reduction in transcript levels.
  • CsIAP1 knockdown resulted in a 73% decrease in median survival compared to controls.
  • Control dsGFP injection did not significantly impact survival, supporting virus transmission models.

Conclusions:

  • RNAi is a feasible and powerful tool for functional genomics in adult C. sonorensis.
  • The conserved function of inhibitor of apoptosis protein 1 (IAP1) was confirmed in this species.
  • This advancement will significantly accelerate research into the vector competence of C. sonorensis.