Using gene topologies to partition sex chromosomes into regions with distinct histories.

A new method using gene topologies accurately delineates sex chromosome strata and their evolutionary histories in Silene and Artemia species.

• Why it matters: Understanding the structure and history of sex chromosome strata is essential for studying sex chromosome evolution, especially in young or rearranged chromosomes where traditional methods are noisy or limited.
• What they did: The authors developed a method that analyzes the proportion of allele topologies from reconstructed X and Y sequences across species, employing change-point analysis to identify transitions and infer shared or convergent evolution.
• The result: The method reliably confirms previous findings, refines them, and uncovers new regions, providing a versatile tool that complements existing approaches for studying sex chromosome evolution.