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Posts tagged cones

A Change in Identity Might Someday Save Vision

retina

No, people with inherited retinal diseases don’t have to adopt new names or personas, or go into witness protection programs, to save their vision. But by changing the identity of cells in the retina — namely rods — researchers may someday be able to slow or halt vision loss for those with retinitis pigmentosa (RP) and other related conditions.

While the innovative therapeutic approach is not ready to be tested in humans, a research team led by Tom Reh, PhD, University of Washington, and Sheng Ding, PhD, University of California, San Francisco, accomplished the feat in mice with RP. The investigators treated rods in the mice with a compound known as photoregulin1 (PR1) that blocked a gene involved in rod development called Nr2e3. That, in turn, reduced the expression (activity) of other rod-associated genes, making the rods less rod-like and more like cones. Doing so stopped retinal degeneration, preserving both rods and cones. Rods and cones are important, because they’re the cells that make vision possible. Results of the PR1 study were published online in the journal Investigative Ophthalmology & Visual Science.

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How Evolution is Leading to Gene Therapies for More Retinal Diseases

Dr. John FlanneryAt first blush, gene therapy for retinal diseases seems so simple: Inject a tiny drop of liquid containing good copies of a gene to replace the bad, and you’re home free. Vision is saved, and, in some cases, it’s even restored.

But the reality is: Developing gene therapies that are safe, effective and long-lasting is very challenging in our world of genetically diverse retinal degenerations. Scientists have to design a delivery system that gets the genes to the right types of cells across the entire retina, but without affecting other cells.
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New Clues for Keeping Cones Alive

Retinal cells, with cones in blue.Woody Allen once said, “I’m not afraid of death; I just don’t want to be there when it happens.” However, for researchers fighting blindness, “being there” when cones die — at least the cones in a mouse model of retinal disease — was recently a good thing. It provided important clues about how to keep them alive in people.

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