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MBE Advance Access published online on December 23, 2003
Molecular Biology and Evolution, doi:10.1093/molbev/msh051
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2003; all rights reserved
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Accepted November 3, 2003
© 2003 Society for Molecular Biology and Evolution

Original Articles

Deletion Bias in Avian Introns over Evolutionary Timescales

Kevin P. Johnson 1*

1 Illinois Natural History Survey, Champaign, Illinois 61820

* To whom correspondence should be addressed. E-mail: kjohnson{at}inhs.uiuc.edu.


  Abstract

The role that introns play in the function and evolution of nuclear genomes is not fully understood. Recent models of intron evolution suggest selection and drift may interact to maintain introns in multicellular organisms. In addition, deletion mutations are more likely to become fixed than insertion mutations. Examination of indel substitutions over macroevolutionary timescales in pigeons and doves (Aves: Columbiformes) reveals that deletion substitutions outnumber insertion substitutions by over six times. The length of indel events is variable.


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