Engineered tool improves DNA editing in mammalian cells
Editing efficiency rose from 4.29% with the original tool to 48.94% with the engineered version in experiments with mammalian cells.
Our read
Interventions- Studied:
- Preprint: experiments in mammalian cells, against the original tool
- What changed:
- DNA editing efficiency rose from 4.29% with the original tool to 48.94% with eTasR
- The catch:
- Editing efficiency is reported without measurements of editing safety
Editor of record: Boris Djordjevic · AgingResearch.News
Mammalian cells showed higher genome-editing efficiency in experiments with an engineered version of ParTasR, a DNA-cutting protein. The researchers used the protein’s structure to guide changes and joined it to TREX2, an enzyme that cuts DNA from its ends. They named the resulting tool eTasR.
Editing efficiency rose from 4.29% with the original tool to 48.94% with eTasR. The authors reported an average 26.52-fold increase and greater efficiency than SpRY, another DNA-cutting tool. Like its starting protein, eTasR did not require a PAM—a short DNA sequence that many editing tools need next to their target. The authors highlighted its compact size for genome-engineering applications.
Why it matters
For research on genes involved in aging, one practical question is how efficiently researchers can edit DNA at chosen sites. The authors propose eTasR as a compact platform for genome editing and therapeutic applications.
Caveats
The cell-editing results do not show how efficiently or safely eTasR would work in people. The work is a preprint and has not been peer-reviewed.
The paper
Engineered Miniature ParTasR Enables Efficient PAMless Genome Editing
State Key Laboratory of Common Mechanisms Research for Major Diseases, Suzhou Institute of Systems Medicine, Chinese Academy of Medical Sciences & Peking Union
bioRxiv, Nov 13, 2026, Open access, Preprint, not yet peer-reviewed
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