
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
Smuggler who called migrants 'chickens' jailed - 2
The most effective method to Pick the Right Volvo XC40 Trim for Your Way of life - 3
From candy cane fishing to ornament switcharoo, here are some of the best games you can play with your loved ones this holiday season - 4
Investigation reveals sperm donor passed on cancer risk to dozens of children across Europe - 5
Carrefour becomes first European retailer to offer shopping on ChatGPT
Israel approves death penalty law for Palestinians convicted of attacks
NASA's Artemis 2 moon launch seen from space | Space photo of the day for April 2, 2026
Why do people get headaches and migraines? A child neurologist explains the science of head pain and how to treat it
Attorney-General to High Court: Gov’t violating draft ruling, risking rule of law
5 Different ways Macintosh is Prepared to Overwhelm Gaming, Even Against Windows
Iranian rockets hit Tel Aviv area, injuring six
EU states agree first step for Ukraine reparations fund
The last penny was pressed by the U.S. Mint in Philadelphia today. Could the nickel and dime be next?
BHP liable for 2015 Brazil mine disaster: UK court












