How old are you? Genet age estimates in a clonal animal
How old are you? Genet age estimates in a clonal animal
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DOI：
10.1111/mec.13865
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发表时间：
2016-11-01
影响因子：
4.9
通讯作者：
Baums, I. B.
中科院分区：
文献类型：
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作者：
Devlin-Durante, M. K.;Miller, M. W.;Baums, I. B.
红杉、海草和珊瑚等基础物种通常寿命长且为无性繁殖。基因组可能由数百个成员（分株）组成，起源于数百至数千年前。随着气候变化和其他压力因素对物种施加选择压力，种群的人口结构发生变化。然而，由于克隆生物的大小并不表明年龄，人口统计模型缺少预测许多基础物种恢复力所必需的数据。在这里，我们将体细胞突变与珊瑚的遗传年龄相关联，并提供了殖民动物遗传年龄的第一个初步估计。我们观察到体细胞突变的5个微卫星位点的范围内的濒危珊瑚，鹿角珊瑚（n = 3352）的样本。殖民地在147个基因中含有342个独特的突变。遗传年龄范围为30至838年，假设突变率为1.195（-04）每个位点每年的基础上，殖民地的增长率和236至6500年，假设突变率为1.542（-05）每个位点每年的基础上，海平面变化的栖息地的可用性。长寿A. palmata基因暗示了一个大的能力，以容忍过去的环境变化，但最近的大规模死亡事件在A。palmata表明，目前的能力经常被超过。
Foundation species such as redwoods, seagrasses and corals are often long-lived and clonal. Genets may consist of hundreds of members (ramets) and originated hundreds to thousands of years ago. As climate change and other stressors exert selection pressure on species, the demography of populations changes. Yet, because size does not indicate age in clonal organisms, demographic models are missing data necessary to predict the resilience of many foundation species. Here, we correlate somatic mutations with genet age of corals and provide the first, preliminary estimates of genet age in a colonial animal. We observed somatic mutations at five microsatellite loci in rangewide samples of the endangered coral, Acropora palmata (n = 3352). Colonies harboured 342 unique mutations in 147 genets. Genet age ranged from 30 to 838 years assuming a mutation rate of 1.195(-04) per locus per year based on colony growth rates and 236 to 6500 years assuming a mutation rate of 1.542(-05) per locus per year based on sea level changes to habitat availability. Long-lived A. palmata genets imply a large capacity to tolerate past environmental change, and yet recent mass mortality events in A. palmata suggest that capacity is now being frequently exceeded.