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Molecular Biology and Evolution, Vol 13, 483-493, Copyright © 1996 by Society for Molecular Biology and Evolution


ORIGINAL ARTICLE

Evolution of gene families and relationship with organismal evolution: rapid divergence of tissue-specific genes in the early evolution of chordates

N Iwabe, K Kuma and T Miyata
Department of Biophysics, Kyoto University, Japan.

To determine a possible relationship between organismal and molecular evolution, the divergence patterns of gene families were examined by taking special notice of functional difference, tissue distribution, and intracellular localization of the members. A phylogenetic analysis of 25 different gene families revealed interesting patterns of divergence of these families: Most gene duplications giving rise to different functions antedate the vertebrates-arthropods separation. On the other hand, in a group of members carrying virtually identical function to one another but differing in tissue distribution (tissue- specific isoform), most gene duplications have occurred independently in each of vertebrates and arthropods after the separation of the two animal groups. In family members encoding molecules localizing in cell compartments (compartmentalized isoforms), the gene duplications antedate the animals-fungi separation. In the cases of the Ca2+ pump and rab subfamilies, the compartmentalized isoforms were shown to have diverged during the early evolution of eukaryotes. A phylogenetic analysis of the tissue-specific isoforms from 26 different subfamilies revealed extensive gene duplications and rapid rates of amino acid substitutions in the early evolution of chordates before the separation of fishes and tetrapods. On the contrary, the genetic variations are relatively low in the later period. This pattern of evolution observed at the molecular level is correlated well with that of tissue evolution based on fossil evidence and morphological data, and thus evolution at the two levels may be related.
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