ArticleGenetics2026
Global genomic diversity of the selfing nematode Caenorhabditis tropicalis correlates with geography.
Article in Genetics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
5 citing papers in PubMed.
- A gap-free, telomere-to-telomere genome assembly for the Caenorhabditis briggsae reference strain AF16.G3 (Bethesda, Md.) · 2026Article
- A Male Expressed Copulatory Plug Increases Female Fertility inbioRxiv : the preprint server for biology · 2026Article
- Evaluating beta-tubulin variants as predictors of benzimidazole resistance across Caenorhabditis nematodes.PLoS pathogens · 2026Article
- A gap-free, telomere-to-telomere genome assembly for thebioRxiv : the preprint server for biology · 2026Article
- FLInt inmicroPublication biology · 2026Article
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28 authors.
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Abstract
Self-fertilization reduces genetic diversity compared to outcrossing and hypothetically decreases the ability to adapt to diverse environments. Among Caenorhabditis nematodes, self-fertilization evolved three times independently in Caenorhabditis elegans, Caenorhabditis briggsae, and the more recently discovered Caenorhabditis tropicalis. To survey C. tropicalis genetic relatedness, the influence of geography and niche on species-wide variation, and the signatures of selection, we collected 785 wild strains, sequenced their genomes, and identified 622 distinct genotypes (isotypes). In contrast to C. elegans and C. briggsae, C. tropicalis relatedness shows substantial association with geography and no transcontinental selective sweeps or broadly sampled isotypes. Populations from the Hawaiian Islands or Taiwan harbor more genetic variation than populations from the Caribbean or Americas, suggesting a Pacific species origin similar to other members of the Elegans subclade. Punctuated genomic regions of extreme genetic variation pervade the genome. These hyper-divergent regions (HDRs) comprise less than 6% of the reference genome despite harboring 73% of all variant sites on average and are enriched for genes likely involved in environmental adaptation. HDRs represent a shared genomic feature of self-fertilizing Caenorhabditis nematodes despite their independent evolutionary origins and suggest a mechanism to explain worldwide distributions despite low species-wide levels of genetic variation.
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