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MBE Advance Access published online on September 1, 2004
Molecular Biology and Evolution, doi:10.1093/molbev/msh246
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2004; all rights reserved
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Accepted August 23, 2004

Research Article

Adaptive Evolution Drives the Diversification of Zinc-finger Binding Domains

Deena Schmidt 1 Rick Durrett 1*

1 Center for Applied Mathematics and Department of Mathematics Cornell University

* To whom correspondence should be addressed. E-mail: rtd1{at}cornell.edu.


  Abstract

The human genome is estimated to contain 700 zinc finger genes, which perform many key functions including regulating transcription. The dramatic increase in the number of these genes as we move from yeast to C. elegans to Drosophila and to humans, as well as the clustered organization of these genes in humans suggests that gene duplication has played an important role in expanding this family of genes. Using likelihood methods developed by Yang and parsimony methods introduced by Suzuki and Gojobori, we have investigated four clusters of zinc finger genes on human chromosome 19 and found evidence that positive selection was involved in diversifying the family of zinc finger binding motifs.

Keywords: tandem gene duplication; adaptive evolution; zinc-finger genes.
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