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Extrachromosomal circular DNAs and genomic sequence plasticity in eukaryotic cells
1Department of Biochemistry, University of South Alabama College of Medicine, Mobile 36688.
Mutation Research
|September 1, 1990
Summary
Extrachromosomal circular DNA (eccDNA) sequences change with environmental conditions, influencing organism development. These eccDNAs, potentially arising from genetic rearrangements, reflect genome plasticity during aging and development.
Area of Science:
- Genetics
- Molecular Biology
- Developmental Biology
Background:
- Eukaryotic organisms exhibit phenotypic plasticity in response to environmental changes.
- Extrachromosomal circular DNA (eccDNA) sequences are often associated with this variation.
- eccDNAs are diverse in size, sequence, and copy number.
Purpose of the Study:
- To review findings and concepts regarding eccDNAs.
- To explore the role of eccDNAs in eukaryotic genome plasticity.
- To discuss the potential origins and implications of eccDNAs.
Main Methods:
- Review of existing literature on eccDNA.
- Analysis of sequence homology between eccDNA and chromosomal DNA.
- Examination of repetitive elements and retrotransposon-like sequences in eccDNA.
Main Results:
- eccDNAs contain sequences homologous to chromosomal DNA, suggesting origins from genetic rearrangements like homologous recombination.
- Repetitive sequences in eccDNA support the role of intrachromosomal recombination.
- Some eccDNA fractions exhibit retrotransposon-like characteristics.
Conclusions:
- eccDNAs may arise from genetic instability and recombination events.
- Changes in eccDNA sequences could indicate altered gene expression patterns.
- eccDNAs are implicated in developmental plasticity and genome instability during aging.