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A test for adaptive change in DNA sequences controlling transcription
D L Jenkins1, C A Ortori, J F Brookfield
1Department of Genetics, University of Nottingham, Queens Medical Centre, U.K.
Proceedings. Biological Sciences
|August 22, 1995
Summary
Scientists developed a new statistical test to detect adaptive evolution in gene regulatory DNA sequences. This method revealed adaptive changes in Drosophila gene expression control, even under strong selective constraint.
Area of Science:
- Evolutionary biology
- Developmental biology
- Genetics
Background:
- Gene expression patterns in early development are shaped by transcription factors interacting with DNA regulatory elements.
- Evolutionary changes in developmental processes are often driven by alterations in these DNA-binding sequences.
Purpose of the Study:
- To introduce and validate a novel statistical test for identifying adaptive evolution in gene regulatory sequences.
- To investigate adaptive evolution in the control of gene expression using this new method.
Main Methods:
- A non-parametric statistical test comparing DNA polymorphism and fixed substitutions between species was employed.
- The test was applied to DNA sequences within the 'zebra' elements of the fushi terazu gene in the Drosophila melanogaster species group.
Main Results:
- The statistical test provided significant evidence for adaptive substitutions in the analyzed regulatory sequences.
- These findings were observed despite strong evidence of overall selective constraint on these DNA regions.
Conclusions:
- The developed statistical test is effective in detecting adaptive evolution in gene regulatory sequences.
- This approach can be broadly applied to study adaptive evolution in gene expression control across different species.