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Researchers developed a multi-scale experimental and modeling framework to quantify mating strategies in yeast, revealing that sibling gametes produced from the same meiotic division follow a reproductive hierarchy where one pair typically mates first, fundamentally altering mating opportunities for the remaining siblings. The study demonstrates that temporal differences in germination and mating competency create heterogeneous reproductive outcomes among genetically similar gametes, with mating strategies shifting based on cell density, genotype, and environmental conditions. These findings challenge simple models of yeast reproduction by showing that sibling diversification may function as a form of reproductive bet-hedging.
Why it matters
This work provides quantitative insights into how microorganisms balance inbreeding versus outcrossing, which has implications for understanding evolutionary strategies, genetic diversity maintenance, and predicting population dynamics in fungi and other organisms with similar life cycles. The temporal barrier findings could inform biotechnology applications requiring controlled mating or hybridization in yeast systems.
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⚠️ Preprint – Noch nicht peer-reviewed
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Mating strategies shape inbreeding, gene flow and genetic diversity, yet their outcomes remain challenging to quantify. In Saccharomyces, population-genomic models predict mating predominantly between sibling meiotic products, with rare selfing and outcrossing. Here we developed an integrated framework combining multicolor flow cytometry, time-resolved imaging and mathematical modelling to directly quantify mating across scales. Bulk measurements revealed coexisting strategies whose frequencies vary with density, genotype and environment. A minimal stochastic model uses these population-level patterns to infer probabilistic hierarchies among mating modes, which single-tetrad analyses independently support. These reveal divergent and interdependent reproductive trajectories among sibling gametes, with one pair typically mating first and reshaping opportunities for the others. Temporal heterogeneity in germination and mating further diversifies reproductive outcomes and shapes compatibility, as experimental synchronization overcomes temporal reproductive barriers, enabling hybridization. Together, reproductive strategy emerges from heterogeneous gamete fates, raising the possibility that sibling diversification constitutes reproductive bet-hedging.
Source: A reproductive hierarchy controls mating fates among sibling yeast gametes