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Real-Time Quantification of the Effects of IS200/IS605 Family-Associated TnpB on Transposon Activity
Published on: January 20, 2023
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Non-allelic gene conversion enables rapid evolutionary change at multiple regulatory sites encoded by transposable
Christopher E Ellison1, Doris Bachtrog1
1Department of Integrative Biology, University of California, Berkeley, Berkeley, United States.
Elife
|February 18, 2015
Summary
Transposable elements (TEs) rapidly evolve regulatory functions. Two mutations in ISX elements enhance binding to the dosage compensation complex, spreading via gene conversion and natural selection.
Area of Science:
- Evolutionary biology
- Genetics
- Molecular biology
Background:
- Transposable elements (TEs) can alter gene regulation.
- The ISX element recently amplified, creating many binding sites for the dosage compensation complex on the Drosophila X chromosome.
Purpose of the Study:
- To identify mutations that refine ISX binding sites.
- To understand the evolutionary mechanisms driving the refinement of TE-derived regulatory elements.
Main Methods:
- Identification of linked refining mutations within ISX elements.
- Analysis of mutation frequency and distribution in Drosophila populations.
- Investigation of gene conversion dynamics among ISX elements.
Main Results:
- Two linked mutations were found to increase ISX binding affinity to the dosage compensation complex.
- The derived haplotype carrying these mutations is common in the population, fixed in 30% of ISX insertions.
- High levels of gene conversion facilitate the spread of refining mutations across ISX insertion sites.
Conclusions:
- Refining mutations in TEs can rapidly generate functional regulatory elements.
- Non-allelic gene conversion plays a crucial role in accelerating the evolutionary fine-tuning of regulatory networks.
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