High-resolution recombination map in C. elegans reveals sex differences shaped by meiotic chromosome structure

Research published in PLOS Genetics by Zachary D. Bush, John S. Conery, Hannah R. Wilson, and colleagues at the laboratory of Diana E. Libuda presents a high-resolution global map of meiotic recombination in the nematode Caenorhabditis elegans, revealing substantial sexual dimorphism in crossover distribution.

Crossover recombination during meiosis repairs DNA double-strand breaks and ensures accurate chromosome segregation. In many organisms, crossovers cluster at kilobase-scale hotspots, but C. elegans is unusual in distributing crossovers across much broader megabase-scale chromosomal domains. The new study shows that the precise distribution of those crossovers differs markedly between hermaphrodite and male meiosis.

The authors identify meiotic chromosomal features and structural elements as determinants of these sex-specific patterns. The findings advance understanding of how chromosome organisation shapes recombination outcomes and may have broader implications for models of meiotic regulation and genome evolution. C. elegans remains a central model organism for meiosis research because of its genetic tractability and well-characterised chromosome biology.

The study is of primary interest to researchers working on meiosis, recombination, and chromosome biology, and provides well-characterised empirical material for educators and students covering these topics.