title: Genomic dispersion of 28S rDNA during karyotypic evolution in the ant genus Myrmecia (Formicidae)
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.
authors.affiliation: Primate Research Institute, Kyoto University, Inuyama, Aichi-ken 484, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Hirai
authors.forename: M T
authors.initials: MT
authors.lastname: Yamamoto
authors.forename: R W
authors.initials: RW
authors.lastname: Taylor
authors.forename: H T
authors.initials: HT
authors.lastname: Imai
mesh_terms: D000818:Animals; D001000:Ants / Q000235:genetics*; D002874:Chromosome Mapping; D002875:Chromosomes; D004275:DNA, Ribosomal; D019143:Evolution, Molecular; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping / Q000379:methods*
chemical_list: D004275:DNA, Ribosomal