Interspecific Comparison in the Frequency of Concerted Evolution at the Polyubiquitin Gene Locus |
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Authors: | Mitsuru Nenoi Sachiko Ichimura Kazuei Mita |
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Institution: | (1) Division of Biology and Oncology, National Institute of Radiological Sciences, 9-1, Anagawa-4-chome, Inage-ku, Chiba-shi 263-8555 Japan, JP;(2) Genome Research Group, National Institute of Radiological Sciences, 9-1, Anagawa-4-chome, Inage-ku, Chiba-shi 263-8555 Japan, JP |
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Abstract: | The polyubiquitin gene, encoding tandemly repeated multiple ubiquitins, constitutes a uniquitin gene subfamily. It has been
demonstrated that polyubiquitin genes are subject to concerted evolution; namely, the individual ubiquitin coding units contained
within a polyubiquitin gene are more similar to one another than they are to the ubiquitin coding units in the orthologous
gene from other species. However there has been no comprehensive study on the concerted evolution of polyubiquitin genes in
a wide range of species, because the relationships (orthologous or paralogous) among multiple polyubiquitin genes from different
species have not been extensively analyzed yet. In this report, we present the results of analyzing the nucleotide sequence
of polyubiquitin genes of mammals, available in the DDBJ/EMBL/GenBank nucleotide sequence databases, in which we found that
there are two groups of polyubiquitin genes in an orthologous relationship. Based on this result, we analyzed the concerted
evolution of the polyubiquitin gene in various species and compared the frequency of concerted evolutionary events interspecifically
by taking into consideration that the rate of synonymous substitution at the polyubiquitin gene locus may vary depending on
species. We found that the concerted evolutionary events in polyubiquitin genes have been more frequent in rats and Chinese
hamsters than those in humans, cows, and sheep. The guinea pig polyubiquitin gene was an intermediate example. The frequency
of concerted evolution in the mouse gene was unexpectedly low compared to that of other rodent genes.
Received: 18 January 2000 / Accepted: 26 April 2000 |
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Keywords: | : Polyubiquitin gene — Orthologue — Synonymous substitution — Synonymous sequence difference — Concerted evolution — Phylogenetic tree |
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