Genomic dispersion of 28S rDNA during karyotypic evolution in the ant genusMyrmecia (Formicidae) |
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| Authors: | Hirohisa Hirai Masa-Toshi Yamamoto Robert W Taylor Hirotami T Imai |
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| Institution: | (1) Primate Research Institute, Kyoto University, Inuyama, Aichi-ken 484, Japan, JP;(2) Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Kyoto 606, Japan, JP;(3) Division of Entomology, CSIRO, Canberra, ACT 2601, Australia, AU;(4) National Institute of Genetics, Mishima, Shizoka-ken 411, Japan, JP |
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| Abstract: | The chromosomal localization of 28S rDNA was investigated in 16 speices of the Australian ant genus Myrmecia, with 2n numbers ranging from 4 to 76, using the fluorescence in situ hybridization method and karyographic analysis. A unique phenomenon
was observed: the number of chromosomes carrying 28S rDNA increases from 2 in species with low chromosome numbers to 19 in
species with high chromosome numbers. This is termed rDNA dispersion. Centric fission and a reciprocal translocation that
occurs in C-bands were detected as the major mechanisms involved in rDNA dispersion.
Received: 22 March 1996; in revised form: 3 June 1996 / Accepted: 4 June 1996 |
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