
The baby saved from a rare disease by a first-ever personalized gene fix has reached a big milestone, taking his first steps ahead of Christmas.
KJ Muldoon is walking and getting ready to celebrate the holiday season at home with his parents and three siblings.
KJ was born last year with a genetic disorder called carbamoyl-phosphate synthetase 1 deficiency. Also known as CPS1 deficiency, the metabolic condition affects only 1 in 1.3 million babies and often leads to life-threatening outcomes.
When he was 6 months old, doctors began giving KJ a groundbreaking new treatment -- a personalized CRISPR gene editing therapy at Children's Hospital of Philadelphia.
Doctors save baby's life with first-ever gene fix for deadly rare disease
The gene-editing therapy works like a "molecular spell-checker,” finding and fixing the specific genetic error causing his condition.
After three infusions and after spending the first 10 months of his life in a hospital, KJ was discharged and sent home in June.
Baby saved by gene-editing therapy 'graduates' from hospital, goes home
Since then, KJ has continued to grow and thrive with his family, celebrating his first birthday at home and taking part in one of the family’s favorite rituals -- cheering for their beloved Philadelphia Eagles.
Doctors hope new technology like CRISPR gene-editing therapies can be the key to treating more than 7,000 rare diseases, such as sickle cell disease, cystic fibrosis, Huntington’s disease and muscular dystrophy, that affect approximately 30 million people across the country.
LATEST POSTS
- 1
Exemplary Fragrances: A Manual for Notorious Scents - 2
Mosquitoes carrying malaria are evolving more quickly than insecticides can kill them – researchers pinpoint how - 3
Instructions to Decide whether a Fender bender Legal counselor is Required for Your Particular Case - 4
Germany and trade unions kick off tough public-sector wage talks - 5
Sophie Kinsella, 'Confessions of a Shopaholic' author, dies at 55 after battle with cancer
'You're no longer my sister' - rows erupt as war divides Iranian families
Israel issues notice that Ben-Gurion Airport flights likely restricted until at least April 16
Geminid meteors streak under green sky | Space photo of the day for Dec. 19, 2025
November Lease Deals for the 2025 Kia EV6 are Too Good to Pass Up
Science is best communicated through identity and culture – how researchers are ensuring STEM serves their communities
Spain breaks jobs record with 22 million Social Security contributors
Germany records first wolf bite on human since repopulation
The Best Computer games Ever
'Pluribus' release date: Everything you need to know about the new series from 'Better Call Saul's' co-creator













