Journal
TRENDS IN GENETICS
Volume 19, Issue 9, Pages 479-484Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/S0168-9525(03)00203-8
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With the number of sequenced genomes now totaling more than 100, and the availability of rough functional annotations for a substantial proportion of their genes, it has become possible to study the statistics of gene content across genomes. In this article I show that, for many high-level functional categories, the number of genes in each category scales as a power-law of the total number of genes in the genome. The occurrence of such scaling laws can be explained using a simple theoretical model, and this model suggests that the exponents of the observed scaling laws correspond to universal constants of the evolutionary process. I discuss some consequences of these scaling laws for our understanding of organism design.
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