Michigan State University researchers restore retinal nerve connections via gene therapy

Researchers at Michigan State University have demonstrated that gene therapy can not only halt blindness but also physically restore damaged nerve connections in the retina. The study, published in Molecular Therapy Advances, focused on dogs with a hereditary vision disorder caused by faulty copies of the CaBP4 gene, which is essential for chemical signaling in the retina.

By injecting a harmless virus carrying a functional copy of the CaBP4 gene into the retinas of affected Whippet dogs, the team observed significant improvements in vision, particularly in low-light conditions. The treatment led to the expansion of the outer plexiform layer (OPL) and synaptic ribbons within light-registering cells, effectively repairing existing abnormalities and adding new components.

Veterinarian and ophthalmologist Billie Beckwit-Cohen noted that the results confirm the plasticity of the adult retina. This breakthrough suggests that repairing nerve cells in mammals, previously thought to be impossible, may eventually lead to therapies for restoring vision in humans.