Characterization of two rice genes for nuclear-encoded chloroplast ribosomal protein L12 and phylogenetic analysis of the acquisition of transit peptides and gene duplication

被引:6
作者
Kusaka, M [1 ]
Kurashige, M [1 ]
Hirai, A [1 ]
Tsutsumi, N [1 ]
机构
[1] Univ Tokyo, Grad Sch Agr Life Sci, Lab Radiat Genet, Bunkyo Ku, Tokyo 1138657, Japan
关键词
rpl12; Oryza sativa; expression analysis; phylogenetic tree;
D O I
10.1007/s001220050873
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
We have identified two genes coding for chloroplast ribosomal protein L12 encoded in the nuclear genome of rice (Oryza sativa). These genes were designated rpl12-1 and vpl12-2 (rpl12, ribosomal protein L12). Northern analysis with specific probes revealed that both genes are transcribed. The expression of each gene seems to have a different regulatory machinery. It is also suggested that the expression of vpl12-1 is controlled in an organ-specific manner. The deduced amino-acid sequences of the mature peptide parts are more conserved than those of the transit peptide parts in both monocotyledonous and dicotyledonous plants. A phylogenetic tree was constructed using the nucleotide sequences of the transit peptide region of the rpl12s of reported plant. The tree includes estimates of when the transit peptides were acquired, and when the genes were duplicated, in the course of evolution. According to our hypothesis, the nuclear-translocated chloroplast ribosomal protein L12 gene obtained its transit peptide after the divergence of monocots and dicots: then gene duplications occurred independently in monocots and dicots, and subsequently rice and rye branched apart.
引用
收藏
页码:110 / 115
页数:6
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