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DNA Research 2001 8(5):215-219; doi:10.1093/dnares/8.5.215
© 2001 by Kazusa DNA Research Institute
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Characterization of Expressed Genes in the SLL2 Region of Self-Compatible Arabidopsis thaliana

Yoshinobu Takada1, Akiko Ito1 {dagger}, Chie Ninomiya1, Tomohiro Kakizaki1, Yoshihito Takahata1, Go Suzuki2, Katsunori Hatakeyama3, Kokichi Hinata3, Hiroshi Shiba4, Seiji Takayama4, Akira Isogai4 and Masao Watanabe1,*

1Faculty of Agriculture, Iwate University Morioka 020-8550, Japan
2Division of Natural Science, Osaka Kyoiku University Kashiwara 582-8582, Japan
3Research Institute of Seed Production Co. Ltd. Aoba-ku, Sendai 989-3204, Japan
4Graduate School of Biological Sciences, Nara Institute of Science and Technology Ikoma 630-0101, Japan

* To whom correspondence should be addressed. Laboratory of Plant Breeding, Faculty of Agriculture, Iwate University, 3-18-8, Ueda, Morioka 020-8550, Japan, Tel. +81-19-621-6152, Fax. +81-19-621-6177, E-mail: nabe{at}iwate-u.ac.jp

Self-incompatibility in Brassica species is regulated by a set of S-locus genes: SLG, SRK, and SP11/SCR. In the vicinity of the S-locus genes, several expressed genes, SLL2 and SP2/ClpP, etc., were identified in B. campestris. Arabidopsis thaliana is a self-compatible Brassica relative, and its complete genome has been sequenced. From comparison of the genomic sequences between B. campestris and A. thaliana, microsynteny between gene clusters of Arabidopsis and Brassica SLL2 regions was observed, though the S-locus genes, SLG, SRK, and SP11/SCR were not found in the region of Arabidopsis. Almost all genes predicted in this region of Arabidopsis were expressed in both vegetative and reproductive organs, suggesting that the genes in the SLL2 region might not be related to self-incompatibility. Considering the recent speculation that the S-locus genes were translocated as a single unit between Arabidopsis and Brassica, the translocation might have occurred in the region between the SLL2 and SP7 genes.

Key words: Arabidopsis thaliana; expressed genes; genomic organization; S locus; synteny

{dagger} Present address: Iwate Biotechnology Research Center, Kitakami 024-0003, Japan


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