Related Experiment Video
Updated: Jun 20, 2026
05:36
Larval RNA Interference in Silkworm Bombyx mori through Chitosan/dsRNA Nanoparticle Delivery
Published on: October 4, 2024
DNA vector-based RNA interference in cell lines derived from Bombyx mori.
Kosuke Fujita1, Aki Sagisaka, Kazuya Tomimoto
1Innate Immunity Research Unit, National Institute of Agrobiological Sciences, Ibaraki 305-8634, Japan.
Bioscience, Biotechnology, and Biochemistry
|September 8, 2009
Summary
DNA vector-based RNA interference (RNAi) effectively silences genes in silkworm cells. This method significantly reduces reporter gene expression and endogenous clathrin, impacting Bombyx mori nucleopolyhedrovirus entry.
Area of Science:
- Molecular Biology
- Genetics
- Entomology
Background:
- RNA interference (RNAi) is crucial for gene function studies.
- DNA vector-based RNAi offers a method for gene silencing in various organisms.
- Optimizing RNAi in silkworm cell lines is essential for insect molecular biology research.
Purpose of the Study:
- To investigate the efficacy of DNA vector-based RNAi in silkworm cell lines.
- To identify optimal conditions for efficient gene knockdown using long-hairpin RNA.
- To explore the role of clathrin in Bombyx mori nucleopolyhedrovirus (BmNPV) infection.
Main Methods:
- Utilized long-hairpin RNA-expressing plasmid DNA for RNA interference.
- Screened various silkworm cell lines, identifying NIAS-Bm-oyanagi2 as most effective.
- Quantified reporter gene suppression and endogenous clathrin knockdown.
- Assessed BmNPV infection rates in clathrin-knockdown cells.
Main Results:
- NIAS-Bm-oyanagi2 cell line demonstrated high RNAi efficiency.
- Long-hairpin RNA with a ~500 bp stem suppressed reporter gene expression by >99%.
- Loop sequence importance for RNAi was less critical than in Drosophila.
- Significant knockdown of endogenous clathrin was achieved.
- Clathrin knockdown markedly reduced BmNPV-luciferase activity, indicating impaired viral entry.
Conclusions:
- DNA vector-based RNAi is a potent tool for gene silencing in silkworm NIAS-Bm-oyanagi2 cells.
- Clathrin plays a vital role in the cellular entry mechanism of BmNPV.
- This study provides a foundation for functional genomics in silkworms using RNAi.
Related Concept Videos
01:23RNA Interference
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.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
02:15Experimental RNAi
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...