Random, fragile, or correlated: Mechanisms of synteny decay in mammals.

The fragile breakage model (FBM) and correlated breakage model (CBM) better explain mammalian synteny decay than the random breakage model, fitting nearly 200 genomes.

• Why it matters: Understanding the mechanisms behind genome evolution helps improve models used in statistical tests for syntenic regions, addressing gaps in current null hypotheses.
• What they did: Researchers compared three models—RBM, FBM, and CBM—by fitting their theoretical synteny block size distributions to empirical data from mammalian genomes, and inferred parameters aligned with known rates of genome evolution.
• The result: The FBM and CBM are similarly effective, suggesting either could serve as an improved null model for genome evolution, aiding in identifying syntenic regions unlikely due to chance.