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Protein Evolution in the Context of Drosophila Development

Authors
  • Davis, Jerel C.1
  • Brandman, Onn2
  • Petrov, Dmitri A.1
  • 1 Stanford University, Department of Biological Science, 371 Serra Mall, Stanford, CA, 94305, USA , Stanford
  • 2 Stanford University Medical School, Department of Molecular Pharmacology, W200 Clark, 318 Campus Drive, Stanford, CA, 94305, USA , Stanford
Type
Published Article
Journal
Journal of Molecular Evolution
Publisher
Springer-Verlag
Publication Date
May 16, 2005
Volume
60
Issue
6
Pages
774–785
Identifiers
DOI: 10.1007/s00239-004-0241-2
Source
Springer Nature
Keywords
License
Yellow

Abstract

The tempo at which a protein evolves depends not only on the rate at which mutations arise but also on the selective effects that those mutations have at the organismal level. It is intuitive that proteins functioning during different stages of development may be predisposed to having mutations of different selective effects. For example, it has been hypothesized that changes to proteins expressed during early development should have larger phenotypic consequences because later stages depend on them. Conversely, changes to proteins expressed much later in development should have smaller consequences at the organismal level. Here we assess whether proteins expressed at different times during Drosophila development vary systematically in their rates of evolution. We find that proteins expressed early in development and particularly during mid–late embryonic development evolve unusually slowly. In addition, proteins expressed in adult males show an elevated evolutionary rate. These two trends are independent of each other and cannot be explained by peculiar rates of mutation or levels of codon bias. Moreover, the observed patterns appear to hold across several functional classes of genes, although the exact developmental time of the slowest protein evolution differs among each class. We discuss our results in connection with data on the evolution of development.

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