Plant eccDNA as drivers of genome plasticity and stress adaptation.
Ni H, López-Arredondo D, Gu M, Yong-Villalobos L, Xu G
Climate Adaptation
Every tomato plant that survives a brutal summer drought without wilting may be quietly reshuffling these tiny DNA rings to switch on survival genes — a hidden flexibility breeders could someday harness to grow food through the erratic seasons ahead.
Inside plant cells, beyond the main chromosomes, there are tiny loops of DNA floating freely. These loops aren't junk — they carry copies of real genes and can change quickly in response to tough conditions like heat, drought, or salt. Scientists are now realizing that plants use these loops as a kind of rapid-response toolkit to survive stress, and understanding them could change how we think about plant resilience.
Key Findings
Extrachromosomal circular DNA (eccDNA) is widespread across plant genomes and enriched in transposable elements, protein-coding genes, and repetitive sequences.
eccDNAs accumulate dynamically during abiotic stress events (such as drought and temperature extremes), suggesting a functional role in stress tolerance and gene regulation.
Leading models tie eccDNA origin to DNA damage repair and recombination pathways, mechanisms conserved across both plant and non-plant organisms.
chevron_right Technical Summary
Plants carry tiny rings of DNA floating outside their chromosomes, and these rings help plants adapt to stress like drought and heat by rapidly changing which genes are active. This review maps what we know about how these rings form, what they contain, and why they matter for plant survival.
Abstract Preview
Extrachromosomal circular DNA (eccDNA) is now recognized as a widespread and functionally significant feature of plant genomes. Evidence indicates that eccDNAs contribute to genome plasticity and g...
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