代谢产物在植物物种间的不均匀分布
Heterogeneous distribution of metabolites across plant species
摘要：
我们调查了类黄酮，植物次生代谢产物的一个主要类别，跨物种的分布。已知黄嘌呤具有高度的物种特异性，并且曾经被认为是理解生物体的适应性进化和表征的化学标记物。我们使用二分网络调查物种之间的分布，并发现两个异质分布是保守的几个家庭：幂律分布的类黄酮的数量在一个物种中，一个特定的类黄酮的共享物种的数量。为了解释可能的起源的异质性，我们提出了一个简单的模型，基本上，一个单一的参数。因此，我们表明，两个各自的幂律统计出现从简单的进化机制的基础上的乘法过程。这些发现提供了对代谢物多样性的演变和生物体的表征的见解，这些生物体由于不同的原因而无视基因组序列分析。
英文摘要：
We investigate the distribution of flavonoids, a major category of plant secondary metabolites, across species. Flavonoids are known to show high species specificity, and were once considered as chemical markers for understanding adaptive evolution and characterization of living organisms. We investigate the distribution among species using bipartite networks, and find that two heterogeneous distributions are conserved among several families: the power-law distributions of the number of flavonoids in a species and the number of shared species of a particular flavonoid. In order to explain the possible origin of the heterogeneity, we propose a simple model with, essentially, a single parameter. As a result, we show that two respective power-law statistics emerge from simple evolutionary mechanisms based on a multiplicative process. These findings provide insights into the evolution of metabolite diversity and characterization of living organisms that defy genome sequence analysis for different reasons.
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