Healthcast: Gene therapy cures eye disease


Imagine only being able to see the things in front of you in soft focus, and just in black and white. For people with the genetic eye condition achromatopsia those are just some of the side effects. But, researchers are testing a new treatment designed to cure the condition by fixing the gene responsible.

Each time Tara Cataldo prepares to leave her house, she has to make sure her face is completely shielded from the sun.

“I need to have very dark, very tinted sunglasses to feel comfortable outside and to see really well.” Cataldo told Ivanhoe.

Tara has achromatopsia, a genetic condition that makes her eyes incredibly sensitive to light. She is also very nearsighted; even while wearing glasses or contacts, she can only see clearly at a very short distance.

“I cannot drive a car so I rely on public transportation and my bike to get around.” Cataldo explained.

Christine Kay, MD, a surgical ophthalmologist at the University of Florida said, “There are currently no approved and no effective treatments for achromatopsia.”

Surgical ophthalmologist Christine Kay is working to change that. She is one of a handful of experts testing a gene therapy

“For achromatopsia the cells we have to target are cone cells responsible for decreased vision and color vision and those are cells at the very bottom layer of the retina.” Dr. Kay explained.

Using a tiny cannula, surgeons deliver a normal copy of one of two mutated genes; the CNGA3 or CNGB3 gene, directly into the eye … restoring vision.

Tara’s myopia is so severe that her risk of retinal detachment from any retinal surgery is high, which rules her out for the current trial. In the meantime, Tara says she’s learned to adapt to achromatopsia and live without limitations.

“And I hope all young achromats learn the same thing,” Cataldo said.

Doctor Kay says if the gene could eventually be delivered to the surface of the retina; additional patients, like Tara, could be treated. Agtc, the biotech company that developed the therapies and several U.S. universities have successfully tested this therapy in dogs and sheep.

Copyright 2019 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

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