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Tourist C transposable elements are closely associated with genes expressed in flowers of rice ( Oryza sativa)

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Abstract

Tourist elements comprise a group of transposable elements in plants. One of these elements, Tourist-OsaCatA (a Tourist C element), has been found in the 5´ flanking region of a catalase gene, CatA, in rice ( Oryza sativa). Using reverse transcriptase-PCR (RT-PCR) analyses of leaves, roots, flowers and developing seeds of rice, we assessed the transcription levels of ten known genes containing Tourist C elements, and of three additional putative genes for which expressed sequence tags (ESTs) including Tourist C elements have been isolated. We found that nine of the ten known genes and two of the three represented by ESTs were expressed in at least one of the organs we analyzed, and all of the genes detected were expressed in flowers, usually in stamens or pistils. We also assessed the expression of the 29 Tourist C-containing hypothetical coding sequences (CDSs) obtained so far by high-throughput genomic sequencing. We found that CDSs of all 11 genes whose transcripts were detectable by RT-PCR were expressed in flowers, especially in stamens or pistils. In contrast, RT-PCR analyses of genes or CDSs associated with other miniature inverted-repeat transposable elements (MITEs), such as Tourist D, Gaijin, Explorer, and Castaway, showed that some of them were expressed only minimally or not at all in flowers. Therefore, compared with other MITEs, Tourist C elements seem to show a strong association with genes that are expressed in the flowers of rice.

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Acknowledgements

This work was supported by grants from the Ministry of Agriculture, Forestry and Fisheries of Japan

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Authors and Affiliations

  1. Genome and Biodiversity Research Center, National Institute of Agrobiological Sciences, Kannondai 2-1-2, 305-8602, Tsukuba, Ibaraki , Japan

    M. Iwamoto

  2. Department of Molecular Genetics, National Institute of Agrobiological Sciences, 305-8602, Tsukuba, Ibaraki, Japan

    K. Higo

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  1. M. Iwamoto
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  2. K. Higo
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Correspondence to M. Iwamoto.

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Communicated by G. P. Georgiev

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Iwamoto, M., Higo, K. Tourist C transposable elements are closely associated with genes expressed in flowers of rice ( Oryza sativa). Mol Gen Genomics 268, 771–778 (2003). https://doi.org/10.1007/s00438-002-0797-8

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  • DOI: https://doi.org/10.1007/s00438-002-0797-8

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