
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
How we came to be: Scientists get first look at the evolution of early complex animals - 2
Four Dead in Last Month From Animal Attacks in Nepal - 3
'Stranger Things' series finale trailer shows Hawkins gang gearing up for last battle with Vecna - 4
Israel violated ceasefire with Hezbollah more than 10,000 times, UNIFIL claims - 5
Astronauts head home early after medical issue
German journalists' union condemns attack on reporters in village
Interoceanic Train derails in southern Mexico, injuring at least 15 and halting traffic on line
Geminid meteors streak under green sky | Space photo of the day for Dec. 19, 2025
New heart disease calculator predicts 30-year risk for young adults
5 Movies That Leaving an Imprint with Inventive Innovation
5 Food varieties to Remember for Your Eating regimen for Ideal Wellbeing
Savvy Tips for Seniors Hyundai IONIQ EV
Simple Consideration Plants for Home and Office: An Aide
RFK Jr. guts the US childhood vaccine schedule despite its decades-long safety record












