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追踪被子植物中NBS-LRR基因的祖先谱系及近期扩张情况。

Tracking ancestral lineages and recent expansions of NBS-LRR genes in angiosperms.

作者信息

Shao Zhu-Qing, Wang Bin, Chen Jian-Qun

机构信息

a State Key Laboratory of Pharmaceutical Biotechnology , School of Life Sciences, Nanjing University , Nanjing , China.

出版信息

Plant Signal Behav. 2016 Jul 2;11(7):e1197470. doi: 10.1080/15592324.2016.1197470.

Abstract

Nucleotide-Binding Site-Leucine-Rich Repeat (NBS-LRR) genes are the largest plant disease resistance (R) gene family, accounting for ∼80% of more than 140 cloned R genes. Recently, we systematically investigated NBS-LRR genes in 22 angiosperm genomes. By performing phylogenetic analysis of these genes in major angiosperm clades separately and as a whole, we gained strong evidence supporting that angiosperm NBS-LRR genes are derived from 3 anciently separated NBS-LRR classes: RPW8-NBS-LRR (RNL), TIR-NBS-LRR (TNL) and CC-NBS-LRR (CNL). A total of 23 ancestral NBS-LRR lineages gave rise to the current NBS-LRR diversity of angiosperm through dynamic expansions. Comparative analysis of RNL, TNL, and CNL classes revealed that while RNL genes evolved conservatively to maintain its role in defense signal transduction, the latter 2 classes underwent convergent recent expansions in various plant genomes. The revealed evolutionary pattern of angiosperm NBS-LRR genes reflects a long history of competition between plant and pathogen.

摘要

核苷酸结合位点富含亮氨酸重复序列(NBS-LRR)基因是植物中最大的抗病(R)基因家族,在140多个已克隆的R基因中约占80%。最近,我们系统地研究了22个被子植物基因组中的NBS-LRR基因。通过分别对主要被子植物分支中的这些基因进行系统发育分析以及整体分析,我们获得了有力证据,支持被子植物NBS-LRR基因源自3个古老分化的NBS-LRR类别:RPW8-NBS-LRR(RNL)、TIR-NBS-LRR(TNL)和CC-NBS-LRR(CNL)。总共23个祖先NBS-LRR谱系通过动态扩展产生了当前被子植物的NBS-LRR多样性。对RNL、TNL和CNL类别的比较分析表明,虽然RNL基因进化保守以维持其在防御信号转导中的作用,但后两类在各种植物基因组中经历了趋同的近期扩展。所揭示的被子植物NBS-LRR基因的进化模式反映了植物与病原体之间长期的竞争历史。

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