Parent–offspring similarity in the timing of developmental events: an origin of heterochrony?
Parent–offspring similarity in the timing of developmental events: an origin of heterochrony?
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亲子发育事件时间的相似性：异时性的起源？
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
J. Spicer
中科院分区：
文献类型：
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作者：
O. Tills;S. Rundle;J. Spicer
理解个体发生（发育）和个体发生（进化）之间的联系仍然是生物学的一个关键目标。异时性，即祖先和后代之间发育事件的时间改变，可能是这样一种联系，尽管广泛认为是种间现象的异时性产生过程仍不清楚。然而，种内发育事件的时间变化，如果遗传，可以提供的原材料，异时性起源。然而，迄今为止，遗传发育事件的时间尚未得到证明，虽然最近的工作确实提出了一个遗传基础的种内差异事件发生的时间在胚胎发育的池塘蜗牛，根balthica。因此，在这里，我们使用高分辨率（时间和空间）成像的整个胚胎发育的R。balthica进行父母-后代的12个生理和形态发育事件的时间比较。父母之间的差异，在所有事件的时间是很好的预测，他们的后代之间的时间差异，遗传性证明了这些事件（脚附着和爬行）。这种可遗传的种内发育事件的时间变化可能是物种形成事件的原材料，提供了一个基本的联系，通过heterochrony的个体发育和胚胎发育。
Understanding the link between ontogeny (development) and phylogeny (evolution) remains a key aim of biology. Heterochrony, the altered timing of developmental events between ancestors and descendants, could be such a link although the processes responsible for producing heterochrony, widely viewed as an interspecific phenomenon, are still unclear. However, intraspecific variation in developmental event timing, if heritable, could provide the raw material from which heterochronies originate. To date, however, heritable developmental event timing has not been demonstrated, although recent work did suggest a genetic basis for intraspecific differences in event timing in the embryonic development of the pond snail, Radix balthica. Consequently, here we used high-resolution (temporal and spatial) imaging of the entire embryonic development of R. balthica to perform a parent–offspring comparison of the timing of twelve, physiological and morphological developmental events. Between-parent differences in the timing of all events were good predictors of such timing differences between their offspring, and heritability was demonstrated for two of these events (foot attachment and crawling). Such heritable intraspecific variation in developmental event timing could be the raw material for speciation events, providing a fundamental link between ontogeny and phylogeny, via heterochrony.