Evolution of bidirectional costly mutualism from byproduct consumption.
Evolution of bidirectional costly mutualism from byproduct consumption.
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DOI：
10.1073/pnas.1810949115
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发表时间：
2018-11-20
影响因子：
11.1
通讯作者：
Marx CJ
中科院分区：
文献类型：
--
作者：
Harcombe WR;Chacón JM;Adamowicz EM;Chubiz LM;Marx CJ
生物经常与其他物种交换昂贵的资源。理论表明，物种之间这种自相矛盾的合作可能起源于废物消费。当一个物种从另一个物种的废物中受益时，接受者可以进化以帮助废物产生者。然后可以选择废物产生者提供昂贵的资源作为回报。我们之前证明了这个理论过程的第一步：肠道沙门氏菌进化为分泌一种昂贵的氨基酸，以增加大肠杆菌产生的副产物的获取。在这里，我们提供了一个废物生产者转向昂贵的合作示范。E. coli反复进化出新的糖分泌物来喂养S.肠这一结果证实了长期以来关于代价高昂的互利共生的进化起源的理论。互惠是生命的基本要素，但我们不清楚它们是如何产生的。有人提出了一个两阶段的过程，涉及两种昂贵的资源交换的互惠关系的演变。首先，如果一个物种从第二个物种产生的无成本副产品中获益，并且合作者获得不成比例的副产品，则可以选择由该物种进行昂贵的供应。然后，选择可以驱使第二个物种提供昂贵的资源作为回报。在此之前，一个合成的财团进化出了这种情况的第一阶段：肠道沙门氏菌进化出了昂贵的蛋氨酸生产，以换取营养缺陷型大肠杆菌产生的无成本的碳副产品。在琼脂平板上的生长定位了甲硫氨酸分泌菌周围合作的益处。肠在这里，我们报告说，这些合作伙伴的进一步发展，板导致超合作E。分泌半乳糖的大肠杆菌。糖分泌在复制群落中反复出现，对E.大肠杆菌生产者，但促进S.肠个体成本和群体利益之间的权衡导致了合作和有效的E。大肠杆菌基因型在这个空间结构化的环境中。这项研究提供了一个实验性的例子，从头开始，双向昂贵的互利共生发展的副产品消费。结果验证了从最初的无成本交换中产生的昂贵合作的可行性，这种情况被广泛用于解释互惠物种相互作用的起源，而互惠物种相互作用是地球上生命的核心。
Organisms frequently exchange costly resources with other species. Theory suggests that this paradoxical cooperation between species might have its origins in waste consumption. When a species benefits from the waste of another, the recipient can evolve to aid the waste producer. The waste producer could then be selected to provide costly resources in return. We previously demonstrated the first step of this theorized process: Salmonella enterica evolved to secrete a costly amino acid to increase access to a byproduct generated by Escherichia coli. Here, we provide demonstration of a waste producer switching to costly cooperation. E. coli repeatedly evolved novel secretion of sugar to feed S. enterica. The results validate long-standing theory about the evolutionary origins of costly mutualism. Mutualisms are essential for life, yet it is unclear how they arise. A two-stage process has been proposed for the evolution of mutualisms that involve exchanges of two costly resources. First, costly provisioning by one species may be selected for if that species gains a benefit from costless byproducts generated by a second species, and cooperators get disproportionate access to byproducts. Selection could then drive the second species to provide costly resources in return. Previously, a synthetic consortium evolved the first stage of this scenario: Salmonella enterica evolved costly production of methionine in exchange for costless carbon byproducts generated by an auxotrophic Escherichia coli. Growth on agar plates localized the benefits of cooperation around methionine-secreting S. enterica. Here, we report that further evolution of these partners on plates led to hypercooperative E. coli that secrete the sugar galactose. Sugar secretion arose repeatedly across replicate communities and is costly to E. coli producers, but enhances the growth of S. enterica. The tradeoff between individual costs and group benefits led to maintenance of both cooperative and efficient E. coli genotypes in this spatially structured environment. This study provides an experimental example of de novo, bidirectional costly mutualism evolving from byproduct consumption. The results validate the plausibility of costly cooperation emerging from initially costless exchange, a scenario widely used to explain the origin of the mutualistic species interactions that are central to life on Earth.
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影响因子：
3.7
作者：
Delaney NF;Kaczmarek ME;Ward LM;Swanson PK;Lee MC;Marx CJ
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
Raghunathan A;Reed J;Shin S;Palsson B;Daefler S
通讯作者：
Daefler S
DOI：
10.1038/s41396-017-0038-0
发表时间：
2018-03
期刊：
The ISME journal
影响因子：
--
作者：
Chacón JM;Möbius W;Harcombe WR
通讯作者：
Harcombe WR