Molecular Biology and Evolution, Vol 15, 391-407, Copyright © 1998 by Society for Molecular Biology and Evolution
K Takahashi, Y Terai, M Nishida and N Okada
Short interspersed repetitive elements (SINEs) have been shown to be
excellent markers of molecular phylogeny, since the integration of a SINE
at a particular position in a genome can be considered an unambiguous
derived homologous character. In the present study, we isolated a new
family of SINEs from cichlids in Lake Tanganyika, whose speciation and
diversification have been regarded as prime examples of explosive adaptive
radiation. Members of this new SINE family, which we named the AFC family,
are about 320 bp in length, and each has a tRNA- related region in its 5'
region, as do most of the members of SINE families reported to date. A dot
blot hybridization experiment showed that this family is distributed
extensively in the genomes of cichlids in Africa, with estimated copy
numbers of 2 x 10(3)-2 x 10(4) per haploid genome. Our investigations of
the patterns of insertion of members of this family at six orthologous loci
demonstrated clearly that four previously identified tribes, namely, the
Lamprologini, Ectodini, Tropheini, and Perissodini, each form a
monophyletic group. These results provide a basis for the elucidation of
the phylogenetic framework of the cichlid fishes in Lake Tanganyika.
ORIGINAL ARTICLE
A novel family of short interspersed repetitive elements (SINEs) from cichlids: the patterns of insertion of SINEs at orthologous loci support the proposed monophyly of four major groups of cichlid fishes in Lake Tanganyika
Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama, Japan.
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