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Enhanced partner preference in a promiscuous species by manipulating the expression of a single gene

机译:通过操纵单个基因的表达,增强了混杂物种中伴侣的偏好

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The molecular mechanisms underlying the evolution of complex behaviour are poorly understood. The mammalian genus Microtus provides an excellent model for investigating the evolution of social behaviour. Prairie voles (Microtus ochrogaster) exhibit a monogamous social structure in nature, whereas closely related meadow voles (Microtus pennsylvanicus) are solitary and polygamous(1). In male prairie voles, both vasopressin and dopamine act in the ventral forebrain to regulate selective affiliation between adult mates, known as pair bond formation, as assessed by partner preference in the laboratory(2-4). The vasopressin V1a receptor (V1aR) is expressed at higher levels in the ventral forebrain of monogamous than in promiscuous vole species(5), whereas dopamine receptor distribution is relatively conserved between species. Here we substantially increase partner preference formation in the socially promiscuous meadow vole by using viral vector V1aR gene transfer into the ventral forebrain. We show that a change in the expression of a single gene in the larger context of pre-existing genetic and neural circuits can profoundly alter social behaviour, providing a potential molecular mechanism for the rapid evolution of complex social behaviour.
机译:复杂行为演变的分子机制了解甚少。 Microtus属为研究社会行为的演变提供了一个极好的模型。草原田鼠(Microtus ochrogaster)在自然中具有一夫一妻制的社会结构,而密切相关的草甸田鼠(Microtus pennsylvanicus)是单性和一夫多妻制的(1)。在雄性大田鼠中,加压素和多巴胺都在腹侧前脑中起作用,以调节成年伴侣之间的选择性隶属关系,即成对键形成,这是通过实验室中伴侣的偏爱评估的(2-4)。一夫一妻制的腹侧前脑中的加压素V1a受体(V1aR)的表达要高于杂种田鼠(5),而多巴胺受体的分布在物种之间相对保守。在这里,我们通过使用病毒载体V1aR基因转移到腹侧前脑,大大增加了社会混杂草地田鼠的伴侣偏好形成。我们表明,在现有遗传和神经回路的较大范围内,单个基因表达的改变可以深刻改变社会行为,为复杂社会行为的快速发展提供潜在的分子机制。

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