Genetic architecture supports mosaic brain evolution and independent brain-body size regulation.

Genetic architecture supports mosaic brain evolution and independent brain-body size regulation.
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DOI:
10.1038/ncomms2086
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发表时间:
2012
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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哺乳动物的大脑由不同的部分组成,履行不同的功能。芬利和达林顿认为,哺乳动物大脑的进化受到发育程序的限制,这表明不同的大脑部分不能自由地对选择做出单独的反应,也不能独立于其他部分或整体大脑大小而进化。然而,在大脑重量匹配的哺乳动物之间进行比较,往往会发现大脑部分大小的差异更大,这与强大的发育限制相矛盾。在这里,我们使用涉及超过10,000只小鼠的定量遗传方法来测试这些假设。我们在大脑的七个关键部位确定了大小变化的独立位点,并观察到大脑部位表现出低或无表型相关性,正如马赛克场景所预测的那样。我们还表明,大脑大小的变化是独立调节的身体大小。因此,在较高的系统发育水平上看到的异速生长关系不太可能是强大的发育限制的产物。
The mammalian brain consists of distinct parts that fulfil different functions. Finlay and Darlington have argued that evolution of the mammalian brain is constrained by developmental programs, suggesting that different brain parts are not free to respond individually to selection and evolve independent of other parts or overall brain size. However, comparisons among mammals with matched brain weights often reveal greater differences in brain part size, arguing against strong developmental constraints. Here, we test these hypotheses using a quantitative genetic approach involving over 10,000 mice. We identify independent loci for size variation in seven key parts of the brain, and observe that brain parts show low or no phenotypic correlation, as is predicted by a mosaic scenario. We also demonstrate that variation in brain size is independently regulated from body size. The allometric relations seen at higher phylogenetic levels are thus unlikely to be the product of strong developmental constraints.
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