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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Morton, B. R. Levin, J. A. |
| Description | Author Affiliation: Morton BR ( Department of Biological Sciences, Barnard College, Columbia University, 3009 Broadway, New York, NY 10027, USA. gmorton@barnard.columbia.edu); |
| Abstract | The psbA gene of the chloroplast genome has a codon usage that is unusual for plant chloroplast genes. In the present study the evolutionary status of this codon usage is tested by reconstructing putative ancestral psbA sequences to determine the pattern of change in codon bias during angiosperm divergence. It is shown that the codon biases of the ancestral genes are much stronger than all extant flowering plant psbA genes. This is related to previous work that demonstrated a significant increase in synonymous substitution in psbA relative to other chloroplast genes. It is suggested, based on the two lines of evidence, that the codon bias of this gene currently is not being maintained by selection. Rather, the atypical codon bias simply may be a remnant of an ancestral codon bias that now is being degraded by the mutation bias of the chloroplast genome, in other words, that the psbA gene is not at equilibrium. A model for the evolution of selective pressure on the codon usage of plant chloroplast genes is discussed. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 21 |
| Volume Number | 94 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1997-11-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Evolution, Molecular Genes, Plant Photosynthetic Reaction Center Complex Proteins Genetics Plants Angiosperms Classification Bias (Epidemiology) Chloroplasts Metabolism Codon Genetic Variation Molecular Sequence Data Photosystem II Protein Complex Comparative Study Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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