The Pectin Lyases in Arabidopsis thaliana: Evolution, Selection and Expression Profiles

被引:67
作者
Cao, Jun [1 ]
机构
[1] Jiangsu Univ, Inst Life Sci, Zhenjiang, Jiangsu, Peoples R China
来源
PLOS ONE | 2012年 / 7卷 / 10期
基金
美国国家科学基金会;
关键词
PHYLOGENETIC ANALYSIS; POLYGALACTURONASE GENE; BRASSICA-CAMPESTRIS; STATISTICAL-METHODS; POSITIVE SELECTION; RECEPTOR; INTRONS; DUPLICATION; TRANSPORTER; NETWORK;
D O I
10.1371/journal.pone.0046944
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Pectin lyases are a group of enzymes that are thought to contribute to many biological processes, such as the degradation of pectin. However, until this study, no comprehensive study incorporating phylogeny, chromosomal location, gene duplication, gene organization, functional divergence, adaptive evolution, expression profiling and functional networks has been reported for Arabidopsis. Sixty-seven pectin lyase genes have been identified, and most of them possess signal sequences targeting the secretory pathway. Phylogenetic analyses identified five gene groups with considerable conservation among groups. Pectin lyase genes were non-randomly distributed across chromosomes and clustering was evident. Functional divergence and adaptive evolution analyses suggested that purifying selection was the main force driving pectin lyase evolution, although some critical sites responsible for functional divergence might be the consequence of positive selection. A stigma-and receptacle-specific expression promoter was identified, and it had increased expression in response to wounding. Two hundred and eighty-eight interactions were identified by functional network analyses, and most of these were involved in cellular metabolism, cellular transport and localization, and stimulus responses. This investigation contributes to an improved understanding of the complexity of the Arabidopsis pectin lyase gene family.
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页数:15
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