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Millions of babies worldwide are born with genetic diseases, many of which are caused by unique mutations in their DNA. Credit: P Deliss/Getty

In February, the US Food and Drug Administration (FDA) proposed a radical rethink of how scientists, physicians and manufacturers develop personalized genetic therapies. The regulator’s suggested introduction of a ‘plausible mechanism pathway’ should increase incentives for drug companies to develop personalized treatments, including gene-editing therapies for rare disorders (see go.nature.com/4mnmgzq).

The baby whose life was saved by the first personalized CRISPR therapy

Personalized CRISPR therapies could soon reach thousands — here’s how