science · 3 outlets · 3 linked reports
A Baby's Custom CRISPR Cure Marks a Medical Milestone
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Summary
- Baby KJ, born with the rare and often-fatal metabolic disorder CPS1 deficiency, became the world's first patient treated with a personalized CRISPR gene-editing therapy — developed by CHOP and Penn Medicine in just six months.
- Administered in 2025, the bespoke in vivo therapy let KJ tolerate more protein, cut his medications and reach developmental milestones like walking and talking.
- Marking the case's one-year anniversary in 2026, doctors say it opens the door to on-demand gene-editing cures for rare diseases.
The question
Personalized CRISPR therapies will make many 'incurable' genetic diseases treatable.
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