Kramer Eric M, Li Wanying
Department of Physics, Bard College at Simon's Rock, Great BarringtonMA, United States.
Front Plant Sci. 2017 May 29;8:869. doi: 10.3389/fpls.2017.00869. eCollection 2017.
We analyzed tissue-specific transcriptomes of and identified 66 gene families with a high frequency of "gradient genes" - genes showing a significant expression gradient between tissues. Gradient gene families include many with roles in hormone and peptide signaling, cell wall synthesis and remodeling, secondary metabolism, transcriptional regulation, and transport between cells. We compared the size of the gradient gene families among the genomes of four plant species with radically different body plans - a single-celled algae, a moss, a eudicot, and a monocot - and found that most of the gradient gene families (58/66) expanded in parallel with the evolution of morphological complexity. A novel measure of tissue diversity was used to show that members of any one gradient gene family tend not to be clustered in a single tissue, but are rather apportioned evenly across the tissues studied. Considered together, our results suggest that the diversification of these gene families supported the diversification of tissue types and the evolution of body plan complexity in plants.
我们分析了[具体植物名称未给出]的组织特异性转录组，并鉴定出66个具有高频率“梯度基因”的基因家族——这些基因在不同组织间呈现出显著的表达梯度。梯度基因家族包括许多在激素和肽信号传导、细胞壁合成与重塑、次生代谢、转录调控以及细胞间运输等方面发挥作用的基因家族。我们比较了四种具有截然不同体型结构的植物物种——单细胞藻类、苔藓、双子叶植物和单子叶植物——基因组中梯度基因家族的大小，发现大多数梯度基因家族（58/66）随着形态复杂性的进化而平行扩展。一种新的组织多样性测量方法表明，任何一个梯度基因家族的成员往往不会聚集在单一组织中，而是均匀地分布在所研究的各个组织中。综合来看，我们的结果表明这些基因家族的多样化支持了植物组织类型的多样化以及体型结构复杂性的进化。
