Localised negative feedback shapes genome-wide patterning of meiotic DNA breaks
Genetic diversity within sexually reproducing species arises via the formation and repair of programmed DNA double-strand breaks (DSBs) created by the evolutionarily conserved topoisomerase-like enzyme, Spo11. Because DSBs threaten genome stability, their formation is tightly regulated in both space and time. In S. cerevisiae, Tel1, the orthologue of mammalian Ataxia Telangiectasia Mutated (ATM) kinase, suppresses nearby DSB formation through local inhibition known as DSB interference. However, whether such local inhibition reshapes the genome-wide DSB landscape remains unclear. Here, we develop a quantitative simulation framework to model how Tel1-mediated feedback shapes Spo11-DSB formation across the yeast genome. We demonstrate that innate chromosome-specific DSB patterns, when combined with interference, generate complex, population-level redistribution of DSBs. We define the spatial range over which interference propagates and provide evidence that this regulatory mechanism requires Tel1 recruitment to DSBs via Xrs2 and Tel1 kinase activity. Although the pro-DSB factor Rec114 contributes to DSB regulation, mutation of potential Rec114 phosphorylation sites indicates that it is not an essential target of Tel1. Together, these findings demonstrate how localised negative feedback can drive broad-scale, emergent patterning of a fundamental genome-modifying process, with the potential in meiosis to influence recombination initiation and, consequently, genetic variation across generations. Overall design: CC-seq libraries from sae2D meiotic SK1 S. cerevisiae cells isolated at 6 hours after sporulation induction