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Columbia Scientists Achieve Unprecedented Base Editing in Embryos

7/21/2026

Summary

Story summary

U.S. scientists at Columbia University edited DNA of early human embryos with unprecedented accuracy using base editing.
Geneticist Dieter Egli, who led the work, said the results provide data for debate but warned the technique is not ready for clinical use and safety questions remain.
Base editing swaps genetic letters without the DNA damage typical of earlier CRISPR methods, prompting ethicists to caution that it could enable eugenic trait selection.

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Story summary

U.S. scientists at Columbia University edited DNA of early human embryos with unprecedented accuracy using base editing.
Geneticist Dieter Egli, who led the work, said the results provide data for debate but warned the technique is not ready for clinical use and safety questions remain.
Base editing swaps genetic letters without the DNA damage typical of earlier CRISPR methods, prompting ethicists to caution that it could enable eugenic trait selection.