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Evolution of karyotypes and differentiation in 13 Rattus Species

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Abstract

Karyotypes of 13 Rattus species collected in Asia and Oceania were analysed with special interest to karyotype evolution and species differentiation. They were classified into three groups according to their karyotype similarity. Four species (R. annandalei, R. exulans, R. muelleri and R. norvegicus) with 2n=42 and a karyotype similar to some of the polymorphic karyotypes in the Asian black rats (R. rattus) are classified into the first group. Pericentric inversion of some acrocentrics seemed to have caused the differentiation of these species. The other four species (R. bowersii, R. fuscipes, R. leucopus and R. conatus) with similar karyotypes as the above group, but lower chromosome numbers than 2n=42 are classified into the second group. Robertsonian fusion in some acrocentrics observed in the first group are suggested to have caused the development of the species in this group. The remaining four species (R. sabanus, R. canus, R. huang and R. niviventer) with karyotypes markedly different from the above two in having a fewer number of small metacentrics are classified into the third group. They seemed to be more primitive karyotypes than the other Rattus species. By the comparison between the polymorphic karyotypes in the black rat, and karyotypes in its related species it was suggested that the former had occurred as primary events to the differentiation of the latter. Parallelism between the karyotype evolution and the species differentiation was discussed.

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Authors and Affiliations

  1. National Institute of Genetics, Misima, Japan

    Tosihide H. Yosida

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  1. Tosihide H. Yosida
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Contribution No. 874 from the National Institute of Genetics, Japan. Supported by a grant-in-aid from the Ministry of Education of Japan (No. 92159 and 92332).

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Yosida, T.H. Evolution of karyotypes and differentiation in 13 Rattus Species . Chromosoma 40, 285–297 (1973). https://doi.org/10.1007/BF00326182

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  • DOI: https://doi.org/10.1007/BF00326182

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