Gene Therapy for Gyrate Atrophy
This study will evaluate the safety and effectiveness of gene therapy for patients with gyrate atrophy, an inherited condition in which areas of the retina-the inner lining of the wall of the eye-become thin. Over several decades, this degeneration of the retina causes tunnel vision, night blindness, and other vision problems.
Gyrate atrophy is caused by a defect in the gene responsible for producing an enzyme, ornithine aminotransferase (OAT), that breaks down an amino acid called ornithine. As a result, excessive ornithine buildup causes the retinal thinning. Currently, this condition can only be treated with amino acid tablets and a very low-protein diet with limited fruits and vegetables and more than 2,000 calories a day from carbohydrates and fats. Some patients cannot maintain this diet, and they need another treatment. One possible alternative is to replace the defective gene with one that functions normally.
Patients who have been followed in NEI's Ocular Genetics service may be eligible to participate in this study. Study patients will undergo the following gene therapy procedure:
- Skin biopsy-A small piece of skin is surgically removed from the patient's thigh.
- Gene transfer-Skin cells called keratinocytes are taken from the biopsied tissue and grown in the laboratory. The normal gene that produces OAT is inserted into the cells, causing them to produce more of the enzyme.
- Skin graft-Under local anesthesia, a patch of skin about 2 1/4 inches x 2 1/4 inches is surgically removed from the upper thigh and some of the cells with increased OAT are grafted back onto this area.
Patients will be followed at 1 week and 2 weeks after the procedure, then monthly for 6 months, again at 9 months and 1 year. Follow-up will continue at 1-year intervals in patients in whom the treatment is successful. During each follow-up visit patients will have 2 to 3 tablespoons of blood drawn for tests. A small biopsy (about 1/4 inch) of transplanted cells will also be done at 1 week, 1 month, 3 months, 6 months, 1 year, and each year or so thereafter. These tests will evaluate whether the treated skin cells are producing the deficient OAT enzyme and, if so, how much and for how long. They will also indicate whether the enzyme produced is sufficient to lower ornithine blood levels. Patients will also undergo various eye examinations before grafting and at scheduled follow-up visits. These tests may include electrophysiologic (ERG) testing, fundus photographs, scanning laser ophthalmoscope, visual field test, fluorescein angiogram, visual acuity, and manifest reaction.
|Study Design:||Endpoint Classification: Safety Study
Primary Purpose: Treatment
|Official Title:||Phase I Study in the Safety and Efficacy of Transduced Keratinocytes for Possible Treatment of Gyrate Atrophy|
|Study Start Date:||April 1998|
|Estimated Study Completion Date:||October 2000|
Please refer to this study by its ClinicalTrials.gov identifier: NCT00001735
|United States, Maryland|
|National Eye Institute (NEI)|
|Bethesda, Maryland, United States, 20892|