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Comparative chromosome painting map between two Ryukyu spiny rat species, Tokudaia osimensis and Tokudaia tokunoshimensis (Muridae, Rodentia)

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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
karyotype evolution
spiny rat
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
Type: article (author version)
Appears in Collections:創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松田 洋一

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