Toddler born deaf can hear after gene therapy trial breakthrough her parents call "mind-blowing"

London — One of the youngest children in the world to receive a new type of gene therapy to treat genetic deafness can now hear for the first time in her life. The family of the toddler taking part in a medical trial has called the change in their daughter "mind-blowing."

Opal Sandy, now 18 months old, was born with total deafness due to a fault in the OTOF gene, which makes a protein called Otoferlin. Otoferlin enables communication between cells of the inner ear, or cochlea, and the brain.

As part of a trial run by Cambridge University, Opal received an infusion of a working copy of the OTOF gene in her right ear. The surgical procedure took only 16 minutes and was carried out just before she reached her first birthday.