DNA Research Advance Access published online on May 28, 2008
DNA Research, doi:10.1093/dnares/dsn008
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Genome Structure of the Legume, Lotus japonicus
1 Kazusa DNA Research Institute, 2-6-7 Kazusa-kamatari, Kisarazu, Chiba 292-0818, Japan
2 Graduate School of Human Development and Environment, Kobe University, Kobe 657-8501, Japan
3 Department of Biotechnology, Graduate School of Engineering, Osaka University 2-1 Yamadaoka, Suita 565-0871, Osaka, Japan
4 Institute of Advanced Biosciences, Keio University, Tsuruoka, Yamagata 997-0017, Japan
5 Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
Received 1 April 2008 ; accepted 18 April 2008.
The legume Lotus japonicus has been widely used as a model system to investigate the genetic background of legume-specific phenomena such as symbiotic nitrogen fixation. Here, we report structural features of the L. japonicus genome. The 315.1-Mb sequences determined in this and previous studies correspond to 67% of the genome (472 Mb), and are likely to cover 91.3% of the gene space. Linkage mapping anchored 130-Mb sequences onto the six linkage groups. A total of 10 951 complete and 19 848 partial structures of protein-encoding genes were assigned to the genome. Comparative analysis of these genes revealed the expansion of several functional domains and gene families that are characteristic of L. japonicus. Synteny analysis detected traces of whole-genome duplication and the presence of synteny blocks with other plant genomes to various degrees. This study provides the first opportunity to look into the complex and unique genetic system of legumes.
Key words: Lotus japonicus; genome structure; Fabaceae; comparative analysis
* To whom correspondence should be addressed. Tel. +81 438-52-3933. Fax. +81 438-52-3934. E-mail: tabata{at}kazusa.or.jp
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