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Satellite DNAs-From Localized to Highly Dispersed Genome Components
Eva Šatović-Vukšić1, Miroslav Plohl1
1Division of Molecular Biology, Ruđer Bošković Institute, 10000 Zagreb, Croatia.
Genes
|March 29, 2023
Summary
Satellite DNAs, once thought simple, are now understood as diverse and complex genomic components. This review explores the varied organization and evolution of satellite DNA across species, revealing a richer repetitive DNA landscape.
Area of Science:
- Genomics
- Molecular Biology
- Evolutionary Biology
Background:
- Classical view defined satellite DNAs as tandemly repeated, non-coding sequences in heterochromatin.
- Recent advances in sequencing and bioinformatics allow comprehensive analysis of repetitive DNA, termed the repeatome and satellitome.
Purpose of the Study:
- To compare organizational features of satellite DNAs and satellitomes across diverse species.
- To summarize evolutionary processes driving satellitome diversity.
- To revisit fundamental concepts of repetitive DNA in genomes.
Main Methods:
- Comparative analysis of satellite DNA organization in various animal and plant species.
- Review of recent studies on repeatome and satellitome annotation.
- Bioinformatic analysis of repetitive DNA patterns.
Main Results:
- Satellite DNA and satellitomes exhibit greater diversity and complexity than previously assumed.
- Variations observed in satellite DNA number, abundance, genomic distribution, array length, and chromosomal localization (heterochromatin and euchromatin).
- Interspersion patterns and associations with transposable elements are also diverse.
Conclusions:
- The organization of satellite DNAs is highly variable across the tree of life.
- Evolutionary processes contribute significantly to the observed diversity of satellitomes.
- Repetitive DNA landscapes are more complex and dynamic than the classical view suggested.
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