Abstract
All seventeen black rats collected from Mauritius Island were characterized by having many extra small acrocentric autosomes. Their basic karyotype was of Oceanian type, because of the presence of the large metacentric M1 and M2 pairs, but chromosome numbers in 13 specimens among them were 42, those of 3 specimens 43, and those of the remaining one specimen 44. Although the Oceanian type rat had 2 small acrocentric autosomes (pair no. 13), 16 Mauritius rats had 10 small acrocentrics, and the remaining one had 8 small acrocentrics. Comparative karyotype analysis between Oceanian and Mauritius type rats showed that the extra small acrocentrics found in Mauritius rats were due to Robertsonian fission of small metacentric pairs no. 14 and 18 of the original Oceanian type rat. Only one rat with 8 small acrocentrics showed the heteromorphic pair no. 18 consisting of one metacentric and two acrocentrics. The large metacentric M1 chromosome in 13 of 17 rats examined showed homologous pair, but two of them were heteromorphic by involving one metacentric M1 and two acrocentrics. In the remaining two rats M1 chromosome was not observed, but acrocentric pairs no. 4 and 7 were included. These acrocentrics were also suggested to be originated from Robertsonian fission of the large metacentric M1 chromosome. Robertsonian fission seemed to be one of the important mechanism found in karyotype evolution.
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References
Brinkley, B.R., Stubblefieled, E.: Ultrastructure and interaction of the kinetochore and centrioles in mitosis and meiosis. In: Advanc. Cell Biol. 1, 119–185 (1970)
Capanna, E., Civitelli, M.V.: On the chromosome polymorphism of Rattus rattus L.. A study on West-European population. Experientia (Basel) 27, 383–384 (1971a)
Capanna, E., Civitelli, M.V.: Karyotype analysis of four African populations of Rattus rattus (L.), a statement of the problem of chromosomal polymorphism in the black rat. Boll. Zool. 38, 151 (1971)
Cole, A., Corry, P.M., Langley, R.: Effects of radiation and other agents on the molecular structure and organization of the chromosomes. 23rd Ann. Symp. Fonund. Cancer Res., p. 346–379. Baltimore: William & Wilkings, Co. 1970
Comings, D.E., Okada, T.A.: Whole-mount electron microscopy of the centromere region of metacentric and telocentric mammalian chromosomes. Cytogenetics 9, 436–449 (1970)
Darlington, C.D.: The origion of isochromosomes. J. Genet. 39, 351–361 (1940)
Gropp, A.: Cytologic mechanism of karyotype evolution in insectivores. In “Comparative Mammalian Cytogenetics” (K. Benirschke, ed) pp. 247–265. Berlin-Heidelberg-New York: Springer 1969
Imai, H.T., Crozier, R.H., Taylor, R.W.: Karyotype evolution in Australian ants. Chromosoma (Berl.) 59, 341–393 (1977)
Kato, H., Sagai, T. and Yosida, T.H.: Stable telocentric chromosomes produced by centric fission in Chinese hamster cells in vitro. Chromosoma (Berl.) 40, 183–192 (1973)
Lima-de-Faria, A.: The role of the kinetochore in chromosome organization. Hereditas (Lund) 42, 85–160 (1956)
Matthey, R.: Les chromosomes des mammifères euthérieus Liste critique et essai sur l'évolution chromosomique. Arch. Julius Klaus-Stift. 33, 17–297 (1958)
Patton, J.S., Myers, P.: Chromosomal identify of black rats (Rattus rattus) from the Galapagos Island, Ecuador. Experientia Basel 30, 1140–1142 (1974)
Raman, R., Sharma, T.: Similarity in karyotypes of Rattus rattus with 38 chromosomes from India and other parts of the world. Experientia (Basel) 28, 1375–1377 (1972)
Reig, O.A., Pincheira, J.V., Spotorno, A.O., Waller, P.: New evidence of a 38-chromosome karyotype in South American population of the roof rat, Rattus rattus L. (Rodentia, Muridae). Experientia (Basel) 28, 225–227 (1972)
Rhoades, M.M.: Cytogenetic study of a chromosome fragment in maize. Genetics 21, 491–502 (1936)
Robertson, W.R.B.: Chromosome studies I. Taxonimic relationships shown in the chromosomes of Tettigidae and Acrididae. V-shaped chromosomes and their significance in Acridae, Locustidae and Gryllidae: Chromosomes and variation. J. Morph. 27, 179–331 (1916)
Satya Prakash, K.L. Aswathanarayana; N.V.: The chromosomes of the black rats, Rattus rattus (L): An oriental population with 38 chromosomes. J. Mysore Univ. 25, 23–27 (1972)
Southern, D.I.: Sable telocentric chromosomes produced following Centric misdivision in Myrmeleotettix maculatus. Chromosoma (Berl.) 26, 140–147 (1969)
Todd, N.B.: Karyotype fissing and canid phylogeny. J. theor. Biol. 26, 445–480 (1970)
Upcott, M.B.: The external mechanics of the chromosomes, VI. The behaviour of the centromere at meiosis. Proc. roy. Soc., London, B 124, 336–361 (1937)
White, M. J.D.: Cytogenetics of the grasshopper Moroba scurra, I. Meiosis of interracial and interpopulation hybrids, Aust. J. Zool. 5, 285–304 (1957)
White, M.J.D.: Animal cytology and evolution, 3rd ed. Cambridge: Cambridge University Press 1973
Wurster, D.H., Benirschke, K.: The chromosome studies in the superfamily Bovidae. Chromosoma (Berl.) 25, 152–171 (1968)
Yosida, T.H.: Evolution of karyotypes and differentiation in 13 Rattus species. Chromosoma (Berl.) 40, 285–297 (1973)
Yosida, T.H.: Supernumerary chromosomes in the black rat (Rattus rattus) and their distributions in three geographical variants. Cytogenet. Cell Genet. 18, 149–159 (1977)
Yosida, T.H.: Karyotype of F1 hybrids between Mauritius and Oceanian type black rats. Proc. Japan Acad. 55 (Ser. B) (in press, 1979)
Yosida, T.H., Kato, H., Tsuchiya, K., Moriwaki, K., Ochiai, Y., Monty, J.: Black rats from Mauritius with a new karyotype involving Robertsonian fission (a preliminary note). Proc. Jap. Acad. 55 (Ser. B), 120–125 (1979)
Yosida, T.H., Sagai, T.: Variation of C-bands in the chromosomes of several subspecies of Rattus rattus. Chromosoma (Berl.) 50, 283–300 (1975)
Yosida, T.H., Tsuchija, K., Moriwaki, K.: Karyotypic differences of black rats, Rattus rattus, collected in various localities of East and Southeast Asia and Oceania. Chromosoma (Berl.) 33, 252–267 (1971)
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Yosida, T.H., Kato, H., Tsuchiya, K. et al. Mauritius type black rats with peculiar karyotypes derived from robertsonian fission of small metacentrics. Chromosoma 75, 51–62 (1979). https://doi.org/10.1007/BF00330624
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DOI: https://doi.org/10.1007/BF00330624