Satellite DNA Editing Enables Meiosis-Independent Chromosome Engineering
Zhou, R.; Chen, M. S. S.; Drowns, M. R.; Mailloux, K.; Yin, K.; Vaillancourt, B.; Buell, C. R.; Tsai, C.-J.
Crispr
Aspen groves — those quaking, golden-leafed giants that clone themselves across entire mountainsides — could soon be engineered for climate resilience or disease resistance without waiting decades for the trees to naturally reproduce.
Normally, to shuffle a plant's genetic material in useful ways, scientists have to wait for the plant to flower, set seed, and breed — a process that can take years or decades for trees. This research found a shortcut: by targeting repetitive stretches of DNA that exist in huge numbers throughout tree chromosomes, they could scramble large regions of genetic material all at once using the CRISPR editing tool. The reshuffled chromosomes stayed stable as the aspen trees grew and were cloned, and the trees looked and grew perfectly normally.
Key Findings
CRISPR targeting of repetitive satellite DNA sequences enabled megabase-scale (millions of base pairs) chromosome rearrangements in aspen in just the first generation.
Multiple diverse large-scale structural variants were generated simultaneously in a single editing event, bypassing the need for meiosis (sexual reproduction).
The large chromosomal rearrangements were mitotically stable through clonal propagation and plant regeneration, with no observable growth defects.
chevron_right Technical Summary
Scientists used CRISPR gene editing to rearrange large sections of chromosomes in aspen trees in a single generation, bypassing the slow traditional method that requires waiting for plants to reproduce sexually. The restructured chromosomes were stable as the trees grew and cloned, with no visible harm to the plants.
Abstract Preview
Chromosome{square}scale genome engineering in plants typically relies on locus-specific recombination during meiosis to select desirable outcomes, limiting its application in species with long gene...
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Aspen is a common name for certain tree species in the Populus sect. Populus, of the Populus (poplar) genus. Aspens were referred to as "asps" in earlier forms of English.