Two novel loci underlie natural differences in Caenorhabditis elegans abamectin responses

Area of Science:

• Genetics and Genomics
• Parasitology
• Molecular Biology

Background:

• Parasitic nematodes pose significant global health and economic burdens.
• Increasing anthelmintic resistance necessitates understanding underlying genetic mechanisms.
• The free-living nematode Caenorhabditis elegans serves as a powerful model organism for genetic studies.

Purpose of the Study:

• To identify genetic loci associated with natural variation in macrocyclic lactone (ML) resistance in C. elegans.
• To validate and refine novel resistance loci using near-isogenic lines.
• To identify candidate genes conferring ML resistance in both C. elegans and parasitic nematodes.

Main Methods:

• Utilized wild isolates and recombinant inbred lines of C. elegans to map resistance loci.
• Employed near-isogenic lines to validate and narrow down identified genomic regions.
• Compared ML resistance loci between C. elegans and the parasitic nematode Haemonchus contortus to prioritize candidate genes.

Main Results:

• Identified three genomic regions on chromosome V associated with natural differences in abamectin response.
• Validated and narrowed two previously unknown loci conferring ML resistance.
• Generated a prioritized list of candidate resistance genes shared across nematode species.

Conclusions:

• C. elegans is a valuable model for dissecting the genetic basis of anthelmintic resistance.
• The identified loci and candidate genes provide insights into ML resistance mechanisms.
• This research facilitates the development of strategies to combat resistance in parasitic nematodes.