Fukuda Tatsuya, Yokoyama Jun, Maki Masayuki
Biological Institute, Graduate School of Science, Tohoku University, Aoba, Sendai 980-8578, Japan.
J Mol Evol. 2003 Nov;57(5):588-97. doi: 10.1007/s00239-003-2498-2.
The cycloidea (CYC) gene controls floral symmetry in snapdragon (Antirrhinum majus). We investigated the evolution of CYC-like genes in some species of legumes that have zygomorphic flowers. Two to four CYC-like genes were isolated from a single species. The results of NJ and ML analyses indicate that CYC-like genes in legumes group into two monophyletic clades; one group consists of eight CYC-like genes (Clade 1) and the other contains three CYC-like genes and TB1 of maize (Clade 2). These phylogenetic trees and the Shimodaira-Hasegawa test suggest that Clade 1 is a sister of the original CYC group (Clade 3). Moreover, the result of the GeneTree analysis showed that the CYC-like genes experienced repeated duplication events during the evolution of legumes. We herein speculate as to the role of CYC-like genes in legumes and discuss the evolutionary processes that these genes have undergone.
环化基因（CYC）控制金鱼草（Antirrhinum majus）的花对称性。我们研究了一些具有两侧对称花的豆科植物中CYC类基因的进化情况。从单个物种中分离出了2至4个CYC类基因。邻接法（NJ）和最大似然法（ML）分析结果表明，豆科植物中的CYC类基因分为两个单系分支；一个分支由8个CYC类基因组成（分支1），另一个分支包含3个CYC类基因和玉米的TB1基因（分支2）。这些系统发育树和Shimodaira-Hasegawa检验表明，分支1是原始CYC组（分支3）的姐妹分支。此外，基因树分析结果表明，CYC类基因在豆科植物进化过程中经历了多次重复复制事件。我们在此推测CYC类基因在豆科植物中的作用，并讨论这些基因所经历的进化过程。
