Related Experiment Video
Updated: Feb 21, 2026
10:44
An Introduction to Worm Lab: from Culturing Worms to Mutagenesis
Published on: January 11, 2011
35.8K
Targeted mutagenesis in a human-parasitic nematode
Spencer S Gang1, Michelle L Castelletto2, Astra S Bryant2
1Molecular Biology Institute, University of California, Los Angeles, California, United States of America.
Plos Pathogens
|October 11, 2017
Summary
Researchers developed a CRISPR-Cas9 gene editing tool for parasitic nematodes like Strongyloides stercoralis. This breakthrough allows genetic manipulation, enabling new studies on these medically important parasites.
Area of Science:
- Molecular Biology
- Parasitology
- Genetics
Background:
- Parasitic nematodes infect over a billion people, causing neglected tropical diseases.
- Limited genetic tools hinder understanding of parasitic nematode biology.
- Previous attempts to create targeted gene disruptions in parasitic nematodes have been unsuccessful.
Purpose of the Study:
- To develop a method for CRISPR-Cas9-mediated gene disruption in parasitic nematodes.
- To establish a genetic tool for studying gene function in Strongyloides stercoralis and Strongyloides ratti.
Main Methods:
- CRISPR-Cas9 gene editing was applied to disrupt the unc-22 gene in Strongyloides stercoralis.
- Homology-directed repair was used to resolve mutations, and deletions were observed when repair templates were omitted.
- The developed method was also applied to disrupt the unc-22 gene in Strongyloides ratti.
Main Results:
- Successful gene disruption of the S. stercoralis unc-22 gene, leading to severe motility defects.
- Demonstrated heritability of the induced mutations through host passage and recovery of mutant progeny.
- Successfully disrupted the unc-22 gene in the rat-parasitic nematode, Strongyloides ratti.
Conclusions:
- CRISPR-Cas9 technology is applicable to parasitic nematodes, overcoming previous genetic intervention limitations.
- This new tool enables functional genomics studies in medically relevant parasitic nematodes.
- Facilitates future research into the biology and control of neglected tropical diseases caused by these parasites.
