TY - JOUR TI - Disentangling strictly self-serving mutations from win-win mutations in a mutualistic microbial community AU - Hart, Samuel Frederick Mock AU - Pineda, Jose Mario Bello AU - Chen, Chi-Chun AU - Green, Robin AU - Shou, Wenying A2 - Verstrepen, Kevin J A2 - Tautz, Diethard A2 - Frenoy, Antoine VL - 8 PY - 2019 DA - 2019/06/04 SP - e44812 C1 - eLife 2019;8:e44812 DO - 10.7554/eLife.44812 UR - https://doi.org/10.7554/eLife.44812 AB - Mutualisms can be promoted by pleiotropic win-win mutations which directly benefit self (self-serving) and partner (partner-serving). Intuitively, partner-serving phenotype could be quantified as an individual’s benefit supply rate to partners. Here, we demonstrate the inadequacy of this thinking, and propose an alternative. Specifically, we evolved well-mixed mutualistic communities where two engineered yeast strains exchanged essential metabolites lysine and hypoxanthine. Among cells that consumed lysine and released hypoxanthine, a chromosome duplication mutation seemed win-win: it improved cell’s affinity for lysine (self-serving), and increased hypoxanthine release rate per cell (partner-serving). However, increased release rate was due to increased cell size accompanied by increased lysine utilization per birth. Consequently, total hypoxanthine release rate per lysine utilization (defined as ‘exchange ratio’) remained unchanged. Indeed, this mutation did not increase the steady state growth rate of partner, and is thus solely self-serving during long-term growth. By extension, reduced benefit production rate by an individual may not imply cheating. KW - mutualism KW - benefit KW - cost KW - evolution KW - partner-serving JF - eLife SN - 2050-084X PB - eLife Sciences Publications, Ltd ER -