Separable downmodulation of meiotic axis protein deposition and DNA break induction at chromosome ends.

Multiple chromosome-specific mechanisms suppress axis protein deposition and DNA double-strand breaks within 20 kb of telomeres in Saccharomyces cerevisiae.

• Why it matters: Understanding how meiotic recombination is restricted at chromosome ends is crucial because it influences genetic diversity and genome stability, yet the mechanisms behind this suppression are not fully known.
• What they did: The study examined the roles of the histone methyltransferase Dot1 and the Sir complex in regulating axis proteins and DSBs, revealing that suppression involves multiple, distinct pathways with differing ranges.
• The result: Findings show that Dot1 and Sir complex independently downregulate axis proteins and DSBs near telomeres, with additional regulatory layers maintaining low recombination activity in these regions.