Tracing the origin and evolution of plant TIR-encoding genes.
Toll-interleukin-1 receptor (TIR)-encoding proteins represent one of the most important families of disease resistance genes in plants. Studies that have explored the functional details of these genes tended to focus on only a few limited groups; the origin and evolutionary history of these genes were therefore unclear. In this study, focusing on the four principal groups of TIR-encoding genes, we conducted an extensive genome-wide survey of 32 fully sequenced plant genomes and Expressed Sequence Tags (ESTs) from the gymnosperm Pinus taeda and explored the origins and evolution of these genes. Through the identification of the TIR-encoding genes, the analysis of chromosome positions, the identification and analysis of conserved motifs, and sequence alignment and phylogenetic reconstruction, our results showed that the genes of the TIR-X family (TXs) had an earlier origin and a wider distribution than the genes from the other three groups. TIR-encoding genes experienced large-scale gene duplications during evolution. A skeleton motif pattern of the TIR domain was present in all spermatophytes, and the genes with this skeleton pattern exhibited a conserved and independent evolutionary history in all spermatophytes, including monocots, that followed their gymnosperm origin. This study used comparative genomics to explore the origin and evolutionary history of the four main groups of TIR-encoding genes. Additionally, we unraveled the mechanism behind the uneven distribution of TIR-encoding genes in dicots and monocots.
Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Jiangsu Province Key Laboratory for Plant Ex Situ Conservation, Nanjing 210014, China.
Xiaoqin
X
Sun
Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Jiangsu Province Key Laboratory for Plant Ex Situ Conservation, Nanjing 210014, China.
Hui
H
Pang
Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Jiangsu Province Key Laboratory for Plant Ex Situ Conservation, Nanjing 210014, China.
Mimi
M
Li
State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210093, China. Electronic address: chenjq@nju.edu.cn.
Jianqun
J
Chen
Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Jiangsu Province Key Laboratory for Plant Ex Situ Conservation, Nanjing 210014, China. Electronic address: hangyueyu@gmail.com.
Yueyu
Y
Hang
D020816:Amino Acid Motifs; D019143:Evolution, Molecular; D020224:Expressed Sequence Tags; D017343:Genes, Plant / Q000502:physiology*; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics*; D010944:Plants / Q000235:genetics*; D011956:Receptors, Cell Surface; D016415:Sequence Alignment; D020539:Sequence Analysis, Protein
D010940:Plant Proteins; D011956:Receptors, Cell Surface
Disease resistance genes; Gene evolution; Monocots; T genes; TIR-encoding genes