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Comparative chromosome painting map between two Ryukyu spiny rat species, Tokudaia osimensis and Tokudaia tokunoshimensis (Muridae, Rodentia)
| Title: | Comparative chromosome painting map between two Ryukyu spiny rat species, Tokudaia osimensis and Tokudaia tokunoshimensis (Muridae, Rodentia) |
| Authors: | Nakamura, Taro Browse this author | | Kuroiwa, Asato Browse this author | | Nishida-Umehara, Chizuko Browse this author →KAKEN DB | | Matsubara, Kazumi Browse this author | | Yamada, Fumio Browse this author | | Matsuda, Yoichi Browse this author |
| Keywords: | chromosome painting | | homology | | karyotype evolution | | Muridae | | spiny rat | | Tokudaia |
| Issue Date: | Oct-2007 |
| Publisher: | Springer Netherlands |
| Journal Title: | Chromosome Research |
| Volume: | 15 |
| Issue: | 6 |
| Start Page: | 799 |
| End Page: | 806 |
| Publisher DOI: | 10.1007/s10577-007-1163-9 |
| PMID: | 17874214 |
| Abstract: | Ryukyu spiny rats (genus Tokudaia) are indigenous species that are confined to three islands of the Nansei Shoto archipelago, Amami-Oshima, Tokunoshima and Okinawa-jima, Japan. Tokudaia tokunoshimensis from Tokunoshima Island and Tokudaia osimensis from Amami-Oshima Island are closely related taxonomically, although their karyotypes are quite different: the diploid chromosome numbers and sex chromosome constitution are 2n = 45, X0/X0 for T. tokunoshimensis and 2n = 25, X0/X0 for T. osimensis. We conducted comparative chromosome painting with chromosome-specific DNA probes of the laboratory mouse (Mus musculus) to molecularly examine the chromosome homology between T. tokunoshimensis and T. osimensis, and deduced a possible ancestral karyotype of Tokudaia species and the process of evolutionary chromosome rearrangements. The proposed ancestral karyotype with the diploid number of 2n = 48, XX/XY was similar to the karyotype of T. tokunoshimensis, and the karyotype of T. osimensis would then have been established through at least 14 chromosomal changes, mainly centric fusion and tandem fusion, from the ancestral karyotype. The close karyological relationship between the ancestral karyotypes of Tokudaia and Apodemus also suggests that the chromosomal evolution in the Tokudaia-Apodemus lineage has been very slow and has accelerated only recently in the branch leading to T. osimensis. |
| Rights: | The original publication is available at www.springerlink.com |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/30262 |
| Appears in Collections: | 創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 松田 洋一
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