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Published on: April 11, 2018
Fast satellite DNA evolution in Nothobranchius annual killifishes
Anna Voleníková1,2, Karolína Lukšíková1,3, Pablo Mora2,4
1Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Liběchov, Czech Republic.
Satellite DNA (satDNA) evolves rapidly, with some repeats critical for centromere function. This study examined satDNA in Nothobranchius killifish, revealing lineage-specific centromeric associations and rapid turnover in these important genomic regions.
Area of Science:
- Genomics
- Molecular Biology
- Evolutionary Biology
Background:
- Satellite DNA (satDNA) comprises tandem repeats and plays roles in centromere organization.
- The genus Nothobranchius, African annual killifishes, offers a model for studying rapid evolutionary changes in satDNA.
Purpose of the Study:
- To identify satellite DNA repeats associated with (peri)centromeric regions in Nothobranchius killifishes.
- To investigate the evolutionary dynamics of satDNA in the Southern and Coastal clades of this genus.
Main Methods:
- Molecular cytogenetics
- Bioinformatic analyses
- Comparative genomics
Main Results:
- Two known satellites (NkadSat01-77, NfurSat01-348) were found at centromeres in one Southern clade lineage.
- NfurSat01-348 also appeared outside centromeres in three Coastal clade species.
- A novel satDNA (NrubSat01-48) was identified at centromeres in N. foerschi, N. guentheri, and N. rubripinnis.
Conclusions:
- Satellite DNA associated with centromeres shows rapid turnover and divergent evolutionary trends between Nothobranchius clades.
- These findings highlight the dynamic nature of satDNA in shaping genome evolution within closely related species.
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