Selfing is the safest sex for caenorhabditis tropicalis

Luke M. Noble, John Yuen, Lewis Stevens, Nicolas Moya, Riaad Persaud, Marc Moscatelli, Jacqueline L. Jackson, Gaotian Zhang, Rojin Chitrakar, L. Ryan Baugh, Christian Braendle, Erik C. Andersen, Hannah S. Seidel, Matthew V. Rockman

Research output: Contribution to journalArticlepeer-review


Mating systems have profound effects on genetic diversity and compatibility. The convergent evolution of self-fertilization in three Caenorhabditis species provides a powerful lens to examine causes and consequences of mating system transitions. Among the selfers, C. tropicalis is the least genetically diverse and most afflicted by outbreeding depression. We generated a chromosomal-scale genome for C. tropicalis and surveyed global diversity. Population structure is very strong, and islands of extreme divergence punctuate a genomic background that is highly homogeneous around the globe. Outbreeding depression in the laboratory is caused largely by multiple Medea-like elements, genetically consistent with maternal toxin/zygotic antidote systems. Loci with Medea activity harbor novel and duplicated genes, and their activity is modified by mito-nuclear background. Segregating Medea elements dramatically reduce fitness, and simulations show that selfing limits their spread. Frequent selfing in C. tropicalis may therefore be a strategy to avoid Medea-mediated outbreeding depression.

Original languageEnglish (US)
Article numbere62587
Pages (from-to)1-64
Number of pages64
StatePublished - 2021

ASJC Scopus subject areas

  • General Neuroscience
  • General Biochemistry, Genetics and Molecular Biology
  • General Immunology and Microbiology


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