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Columbia Scientists Perfect Base Editing in Human Embryos

7/9/2026

Summary

Story summary

Columbia University scientists edited DNA of early human embryos with unprecedented accuracy using base editing.
The technique replaces individual genetic letters without the DNA damage typical of CRISPR.
Geneticist Dieter Egli said the data should spark public debate because the study leaves unanswered side-effect questions.
The researchers posted the study online while it undergoes peer review, reviving ethical debates about gene editing to repair disease mutations or select traits.

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Story summary

Columbia University scientists edited DNA of early human embryos with unprecedented accuracy using base editing.
The technique replaces individual genetic letters without the DNA damage typical of CRISPR.
Geneticist Dieter Egli said the data should spark public debate because the study leaves unanswered side-effect questions.
The researchers posted the study online while it undergoes peer review, reviving ethical debates about gene editing to repair disease mutations or select traits.