Evolution of the KCS gene family in plants: the history of gene duplication, sub/neofunctionalization and redundancy
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Very long-chain fatty acids (VLCFAs) play an important role in the survival and development of plants, and VLCFA synthesis is regulated by β-ketoacyl-CoA synthases (KCSs), which catalyze the condensation of an acyl-CoA with malonyl-CoA. Here, we present a genome-wide survey of the genes encoding these enzymes, KCS genes, in 28 species (26 genomes and two transcriptomes), which represents a large phylogenetic scale, and also reconstruct the evolutionary history of this gene family. KCS genes were initially single-copy genes in the green plant lineage; duplication resulted in five ancestral copies in land plants, forming five fundamental monophyletic groups in the phylogenetic tree. Subsequently, KCS genes duplicated to generate 11 genes of angiosperm origin, expanding up to 20–30 members in further-diverged angiosperm species. During this process, tandem duplications had only a small contribution, whereas polyploidy events and large-scale segmental duplications appear to be the main driving force. Accompanying this expansion were variations that led to the sub- and neofunctionalization of different members, resulting in specificity that is likely determined by the 3-D protein structure. Novel functions involved in other physiological processes emerged as well, though redundancy is also observed, largely among recent duplications. Conserved sites and variable sites of KCS proteins are also identified by statistical analysis. The variable sites are likely to be involved in the emergence of product specificity and catalytic power, and conserved sites are possibly responsible for the preservation of fundamental function.
KeywordsKCS genes Evolution Expansion Functional divergence Redundancy
We gratefully acknowledge the editor-in-chief Dr. Hohmann and two anonymous reviewers for their constructive suggestions to improve the manuscript, Dr. Zhu-Qing Shao at Nanjing University for his assistance in the bioinformatics analysis, and Dr. Yang Liu at the University of Connecticut for insightful discussions. This work was supported by grants from the National Natural Science Founding of China to JYX (31300190), XQS (31200177 and 31470448), the Natural Science Founding of Jiangsu Province (BK20130565) to JYX, and Funds of Jiangsu Province Key Laboratory for Plant Ex Situ Conservation to XQS (QIAN201202) (http://www.nsfc.gov.cn, http://www.jskjjh.gov.cn, http://www.cnbg.net/). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Compliance with ethical standards
The authors have declared that no competing interests exist.
This article does not contain any studies with human participants or animals performed by any of the authors.
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