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Columbia Researchers Perform Precise Base Editing in Human Embryos

6/22/2026

Summary

Story summary

Columbia University scientists edited early-human-embryo DNA with unprecedented accuracy using base editing.
The study, led by geneticist Dieter Egli, replaced single genetic letters without the DNA damage typical of CRISPR.
Egli warned that many questions about harmful side effects remain and said the research is not ready for clinical use.
The preprint, posted online while under peer review, has revived ethical debate over disease-fixing versus trait-selection, which some label eugenics.

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Story summary

Columbia University scientists edited early-human-embryo DNA with unprecedented accuracy using base editing.
The study, led by geneticist Dieter Egli, replaced single genetic letters without the DNA damage typical of CRISPR.
Egli warned that many questions about harmful side effects remain and said the research is not ready for clinical use.
The preprint, posted online while under peer review, has revived ethical debate over disease-fixing versus trait-selection, which some label eugenics.