What question did this study set out to answer?

To characterize the global population structure, genetic diversity, and evolutionary forces acting on wild strains of the nematode model Caenorhabditis briggsae.

August 14, 2026Molecular Biology and EvolutionOpen Access

Population structure and punctuated genomic hyper-diversity in Caenorhabditis briggsae

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To characterize the global population structure, genetic diversity, and evolutionary forces acting on wild strains of the nematode model Caenorhabditis briggsae.
Isolated and whole-genome sequenced >1,900 wild C. briggsae strains collected worldwide.
Cataloged single-nucleotide and insertion-deletion variants to evaluate population structure, linkage, and selection patterns across geographic regions.
Compared genomic diversity and hyper-divergent regions against the outbreeding sister species Caenorhabditis nigoni.
Identified over six million single-nucleotide and insertion-deletion variants across newly discovered, genetically distinct populations spanning entire continents.
Discovered punctuated hyper-divergent genomic regions harboring novel genes enriched for environmental sensing and pathogen response mechanisms.
Demonstrated that long-term balancing selection has maintained substantial functional genetic variation tied to ecological diversity since diverging from an outbreeding ancestor.

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Implication

Comparative genomic analysis reveals extensive genetic variation and hyper-divergent regions in wild Caenorhabditis briggsae, indicating ancient balancing selection shapes ecological adaptations.

Cite This Study

Moya et al. (2026) studied this question.

synapsesocial.com/papers/6a7ec78db70b84ec8b913fae https://doi.org/10.1093/molbev/msag202

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Implication

Comparative genomic analysis reveals extensive genetic variation and hyper-divergent regions in wild Caenorhabditis briggsae, indicating ancient balancing selection shapes ecological adaptations.

Population structure and punctuated genomic hyper-diversity in Caenorhabditis briggsae

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Discussion

Implication

Cite This Study

Population structure and punctuated genomic hyper-diversity in Caenorhabditis briggsae

Key Points

Discussion

Implication

Cite This Study

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