Evolution of an obligate social cheater to a superior cooperator
Evolution of an obligate social cheater to a superior cooperator
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DOI：
10.1038/nature04677
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发表时间：
2006-05-18
期刊：
影响因子：
64.8
通讯作者：
Velicer, GJ
中科院分区：
文献类型：
--
作者：
Fiegna, F;Yu, YTN;Velicer, GJ
专性关系已经进化了很多次，可以是寄生的或互利的。专性生物依靠其他生物生存，因此与宿主或伴侣共同进化。一个重要但很少有人探讨的问题是，专性地位是否是进化的终极条件，或者专性血统是否可以进化回自主的生活方式。黄色粘球菌通过孢子子实体的社会发育在饥饿中生存。一些M。尽管如此，在分离时子实体发育缺陷的xanthus基因型可以利用嵌合体组中的熟练基因型。在这里，我们报告了一个进化的过渡，从强制性的依赖利他主机的自主模式的社会合作。这种社会独立性的恢复是由一个单一的突变引起的，该突变具有巨大的影响力，赋予了超过两种祖先基因型的适应性优势，包括免受祖先作弊者剥削的免疫力。因此，一种暂时的强制性欺骗状态成为了一种新的自主社会支配状态的进化垫脚石。
Obligate relationships have evolved many times and can be parasitic or mutualistic. Obligate organisms rely on others to survive and thus coevolve with their host or partner. An important but little explored question is whether obligate status is an evolutionarily terminal condition or whether obligate lineages can evolve back to an autonomous lifestyle. The bacterium Myxococcus xanthus survives starvation by the social development of spore-bearing fruiting bodies. Some M. xanthus genotypes defective at fruiting body development in isolation can nonetheless exploit proficient genotypes in chimaeric groups. Here we report an evolutionary transition from obligate dependence on an altruistic host to an autonomous mode of social cooperation. This restoration of social independence was caused by a single mutation of large effect that confers fitness superiority over both ancestral genotypes, including immunity from exploitation by the ancestral cheater. Thus, a temporary state of obligate cheating served as an evolutionary stepping-stone to a novel state of autonomous social dominance.