Gene Therapy May Cure Color Blindness
Early Study Indicates the Adult Brain Can Rewire Itself When Given New Color-Recognizing Information
Sept. 16, 2009 -- A rainbow of hope for people who are color-blind: New
research suggests that gene therapy could one day give such patients the
ability to see in full color.
Color blindness, also called color vision deficiency, occurs when
photoreceptors in the eye’s retina lack certain light-sensitive pigments. It is
most often hereditary and present at birth. People with this condition can’t
distinguish between different shades of certain colors, or cannot see them at
all. Red-green color blindness is the most common type of color blindness.
There is no cure for inherited color blindness. But scientists have shown
that placing certain color-recognizing (photopigment) genes into eye cells of
male monkeys known to be red-green color-blind allows the animals to tell the
difference between the two colors. The photopigment genes are found in some
female monkeys but never in male monkeys of this type. The scientists tested
the monkeys’ vision by having them perform a computer-based color vision
The study authors say their findings demonstrate that the brain might be
able to reprogram itself when given new sensory information, such as
color-recognizing receptors, even when the key period for brain development is
over. Until now, it’s been assumed that treatment for inherited vision
disorders could only be done in very young patients.
The researchers say their findings could one day lead to new methods for
curing adult vision disorders.
The study appears this week in the online version of Nature.