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Genomic organization of the S core region and the S flanking regions of a class-II S haplotype in Brassica rapa

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Abstract

The nucleotide sequence of an 86.4-kb region that includes the SP11, SRK, and SLG genes of Brassica rapa S-60 (a class-II S haplotype) was determined. In the sequenced region, 13 putative genes were found besides SP11-60, SRK-60, and SLG-60. Five of these sequences were isolated as cDNAs, five were homologues of known genes, cDNAs, or ORFs, and three are hypothetical ORFs. Based on their nucleotide sequences, however, some of them are thought to be non-functional. Two regions of colinearity between the class-II S-60 and Brassica class-I S haplotypes were identified, i.e., S flanking region 1 which shows partial colinearity of non-genic sequences and S flanking region 2 which shows a high level of colinearity. The observed colinearity made it possible to compare the order of SP-11, SRK, and SLG genes in the S locus between the five sequenced S haplotypes. It emerged that the order of SRK and SLG in class-II S-60is the reverse of that in the four class-I S haplotypes reported so far, and the order of SP11, SRK and SLG is the opposite of that in the class-I haplotype S-910. The possible gene designated as SAN1 ( S locus Anther-expressed Non-coding RNA like-1), which is located in the region between SP11-60 and SRK-60, has features reminiscent of genes for non-coding RNAs (ncRNAs), but no homologous sequences were found in the databases. This sequence is transcribed in anthers but not in stigmas or leaves. These features of the genomic structure of S-60 are discussed with special reference to the characteristics of class-II S haplotypes.

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Acknowledgements

We thank Dr. Y. Kuginuki for providing the DH line in B. rapa. E.F. is the recipient of Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists. This work was supported in part by Grant-in-Aid for Special Research on Priority Areas B (No. 11238202) from the Ministry of Education, Science, Sports and Culture, Japan

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  1. Graduate School of Agricultural Science, Tohoku University, Aoba-ku, 981-8555, Sendai, Japan

    E. Fukai, R. Fujimoto & T. Nishio

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  1. E. Fukai
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  2. R. Fujimoto
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  3. T. Nishio
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Correspondence to T. Nishio.

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Communicated by G. Jürgens

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Fukai, E., Fujimoto, R. & Nishio, T. Genomic organization of the S core region and the S flanking regions of a class-II S haplotype in Brassica rapa . Mol Gen Genomics 269, 361–369 (2003). https://doi.org/10.1007/s00438-003-0844-0

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  • DOI: https://doi.org/10.1007/s00438-003-0844-0

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