Analysis of the phylogenetic distribution of isochores in vertebrates and a test of the thermal stability hypothesis

Belle, Elise M S, Smith, Nick and Eyre-Walker, Adam (2002) Analysis of the phylogenetic distribution of isochores in vertebrates and a test of the thermal stability hypothesis. Journal of Molecular Evolution, 55 (3). pp. 356-363. ISSN 0022-2844

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Abstract

Warm-blooded vertebrates show large-scale variation in G + C content along their chromosomes, a pattern which appears to be largely absent from cold-blooded vertebrates. However, compositional variation in poikilotherms has generally been studied by ultracentrifugation rather than sequence analysis. In this paper, we investigate the compositional properties of coding sequences from a broad range of vertebrate poikilotherms using DNA sequence analysis. We find that on average poikilotherms have lower third-codon position GC contents (GC3) than homeotherms but that some poikilotherms have higher mean GC3 values. We find that most poikilotherms have lower variation in GC3 than homeotherms but that there is a correlation between GC12 and GC3 for some species, indicating that there is systematic variation in base composition across their genomes. We also demonstrate that the GC3 of genes in the zebrafish, Danio rerio, is correlated with that in humans, suggesting that vertebrates share a basic isochore structure. However, we find no correlation between either the mean GC3 or the standard deviation in GC3 and body temperature.

Item Type: Article
Schools and Departments: School of Life Sciences > Evolution, Behaviour and Environment
Depositing User: Adam Eyre-Walker
Date Deposited: 06 Feb 2012 18:16
Last Modified: 20 Mar 2012 09:55
URI: http://sro.sussex.ac.uk/id/eprint/15525
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