牙齿微观结构记录了人类生命史的演化步伐。
Tooth microstructure tracks the pace of human life-history evolution.
作者信息
Christopher Dean M
机构信息
Department of Anatomy and Developmental Biology, University College London, Gower Street, London WC1E 6BT, UK.
出版信息
Proc Biol Sci. 2006 Nov 22;273(1603):2799-808. doi: 10.1098/rspb.2006.3583.
Abstract
A number of fundamental milestones define the pace at which animals develop, mature, reproduce and age. These include the length of gestation, the age at weaning and at sexual maturity, the number of offspring produced over a lifetime and the length of life itself. Because a time-scale for dental development can be retrieved from the internal structure of teeth and many of these life-history variables tend to be highly correlated, we can discover more than might be imagined about fossil primates and more, in particular, about fossil hominids and our own evolutionary history. Some insights into the evolutionary processes underlying changes in dental development are emerging from a better understanding of the mechanisms controlling enamel and dentine formation. Our own 18-20-year period of growth and development probably evolved quite recently after ca 17 million years of a more ape-like life-history profile.
摘要
一些基本的里程碑定义了动物发育、成熟、繁殖和衰老的速度。这些包括妊娠期的长短、断奶和性成熟的年龄、一生中生育的后代数量以及寿命本身的长短。由于可以从牙齿的内部结构中获取牙齿发育的时间尺度，并且这些生命史变量中的许多往往高度相关，我们能够发现关于化石灵长类动物的信息比想象的更多，尤其是关于化石原始人类和我们自己的进化史。对控制牙釉质和牙本质形成机制的更好理解，正为深入了解牙齿发育变化背后的进化过程带来一些新见解。在经历了约1700万年更类似猿类的生命史之后，我们自身18至20年的生长发育期可能是最近才演化而来的。
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