Flexibility on the karyotype evolution in bitterlings (Pisces, Cyprinidae) |
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Authors: | T. Ueda H. Naoi R. Arai |
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Affiliation: | (1) Department of Biology, Faculty of Education, Utsunomiya University, 350 Mine, Utsunomiya, 321-8505, Japan;(2) Department of Biology, Faculty of Education, Utsunomiya University, 350 Mine, Utsunomiya, 321-8505, Japan;(3) Department of Zoology, University Museum, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan |
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Abstract: | In bitterlings (Acheilognathinae) C- and Ag-banding karyotypes of 6 species-subspecies collected in China and South Korea were analyzed. The chromosomal constitution of 2n=46 (4SM+42ST) in Rhodeus atremius fangi was quite different from that of 2n=48 (8M+20SM+20ST) in other species-subspecies in Rhodeus. It was concluded from the analysis of banded chromosomes that the increase in number of ST during the karyotype change from 2n=48 to 2n=46 was achieved by a series of pericentric inversions from 24 M-SM to 24 ST, and the decrease in the diploid number was caused by an additional tandem fusion of 4 ST chromosomes, forming a new ST pair in the 2n=46 karyotype. The karyotype of Tanakia koreensis, T. signifer, and Acheilognathus macropterus is 2n=48 (8M+20SM+20ST), 2n=48 (8M+20SM+14–16ST+4–6 A), 2n=44 (14M+16SM+14ST), respectively. In R. ocellatus ocellatus, T. koreensis, T. signifer and A. macropterus, karyotype changes from 2n=48 to 2n=44 due to centric fusion and inversion have also been estimated. It was suggested that C-banding heterochromatin was greatly concerned with the karyotype evolution in bitterlings. |
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Keywords: | Ag-NORs bitterling centric fusion cyprinidae evolution heterochromatin inversion karyotype tandem fusion |
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