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Tracing the origin and evolution of plant TIR-encoding genes
Xiaoqin Sun1, Hui Pang1, Mimi Li1
1Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Jiangsu Province Key Laboratory for Plant Ex Situ Conservation, Nanjing 210014, China.
Gene
|May 3, 2014
Summary
Toll-interleukin-1 receptor (TIR)-encoding genes, crucial for plant disease resistance, originated early and evolved through duplications. Their conserved patterns reveal independent evolutionary histories across seed plants.
Area of Science:
- Plant genomics
- Evolutionary biology
- Molecular genetics
Background:
- Toll-interleukin-1 receptor (TIR)-encoding proteins are vital plant disease resistance genes.
- Previous research focused on limited groups, leaving the origin and evolution unclear.
Purpose of the Study:
- To investigate the origin and evolutionary history of four main groups of TIR-encoding genes.
- To understand the mechanisms behind their distribution in plants.
Main Methods:
- Genome-wide survey of 32 plant genomes and Pinus taeda ESTs.
- Analysis of chromosome positions, conserved motifs, sequence alignment, and phylogenetic reconstruction.
Main Results:
- TIR-X family genes (TXs) show an earlier origin and wider distribution.
- TIR-encoding genes underwent significant duplications during evolution.
- A conserved TIR domain motif pattern exists in all spermatophytes, with independent evolution post-gymnosperm origin.
Conclusions:
- Comparative genomics elucidates the evolutionary trajectory of major TIR-encoding gene groups.
- The study reveals the evolutionary basis for the differential distribution of these genes in monocots and dicots.
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