Gyrate Atrophy Ocular and Systemic Study

Launched by JAEB CENTER FOR HEALTH RESEARCH · Mar 28, 2022

Keywords

ClinConnect Summary

The Gyrate Atrophy Ocular and Systemic Study is researching a rare eye condition called Gyrate Atrophy, which affects the retina and can lead to vision loss. The study aims to better understand how specific genetic mutations related to the ornithine-δ-aminotransferase (OAT) gene influence levels of a substance called ornithine in the blood and how this relates to the progression of retinal degeneration over four years. The study is currently looking for participants aged 12 and older who have been diagnosed with retinal dystrophy in both eyes and have specific genetic markers indicating OAT mutations.

If you or someone you know is interested in participating, you would need to be willing to attend regular study visits over the next four years and be able to provide consent. It’s important to note that certain medical histories or current treatments may disqualify someone from joining the study, such as specific eye surgeries or medications that could affect vision. This study is crucial as it hopes to gather valuable information that could lead to better understanding and potential future treatments for Gyrate Atrophy.

Gender

ALL

Eligibility criteria

• Inclusion Criteria:
• • Participants must meet all the following inclusion criteria at the Screening Visit in order to be eligible to enroll into the genetic screening phase.
• • Willing to participate in the study and able to communicate consent during the consent process.
• • Willing and able to complete all study visit assessments at each visit over the forty-eight (48) month study period. Age ≥ 12 years.
• Must meet one (1) of the Genetic Screening Criteria below:
• • At least 2 disease-causing variants in the OAT gene which are homozygous or heterozygous in trans, based on a report from a clinically certified lab, or a report from a research lab that has been pre-approved by the study Genetics Committee.
• • At least 2 disease-causing variants in the OAT gene with unknown phase, based on a report from a clinically certified lab, or a report from a research lab that has been pre-approved by the study Genetics Committee, AND must meet both of the following phenotype criteria: .Classic fundus appearance of gyrate atrophy (based on investigator discretion) AND Elevated ornithine levels \>300 μmol/L (documented on any prior lab report).
• • Note: if a participant has a variant(s) of unknown significance, they will still qualify if they meet the Genetic Screening Criteria above. Ocular Inclusion Criteria Participant must meet the following criteria at the Screening Visit to enroll into the genetic screening phase.
• • Both eyes must have a clinical diagnosis of retinal dystrophy. Both eyes must permit good quality photographic imaging (e.g., but not limited to, clear ocular media, adequate pupil dilation, stable fixation).
• Exclusion Criteria:
• • Participants must not meet any of the following exclusion criteria at the Screening Visit in order to be eligible to enroll into the genetic screening phase.
• • Single pathogenic or likely pathogenic genetic variants known to be associated with autosomal dominant retinitis pigmentosa/retinal dystrophy (AD, heterozygous), X-374 linked retinitis pigmentosa/retinal dystrophy (XL, hemizygous), or mitochondrial inheritance.
• • Expected to enter experimental treatment trial at any time during this study. History of more than 1 year of cumulative treatment, at any time, with an agent associated with pigmentary retinopathy, including hydroxychloroquine, chloroquine, thioridazine, and deferoxamine. Note: Since this is a Natural History Study collecting data on the progression of Gyrate Atrophy, pregnant women will not be specifically excluded from participation.
• Ocular Exclusion Criteria:
• • If either eye has any of the following ocular exclusion criteria at the Screening Visit, then the participant is not eligible to enroll into the genetic screening phase.
• • Current vitreous hemorrhage.
• • Current or any history of tractional or rhegmatogenous retinal detachment.
• • Current or any history of (for example, but not limited to prior to cataract or refractive surgery) spherical equivalent of the refractive error worse than -8 Diopters of myopia. • • • History of intraocular surgery (for example, but not limited to cataract surgery, vitrectomy, penetrating keratoplasty, or LASIK) within the last 3 months.
• • Current or any history of confirmed diagnosis of glaucoma (for example, but not limited to glaucomatous VF changes or nerve changes, or history of glaucoma filtering surgery). e. Current or any history of retinal vascular occlusion or proliferative diabetic retinopathy.
• • History or current evidence of ocular disease that, in the opinion of the investigator, may confound assessment of visual function.
• • The following medications and treatments are prohibited as they can affect progression of retinal pigmentosa. The participant must not have received or planning to receive the following treatments.
• • Any use of ocular stem cell or gene therapy.
• • Any treatment with ocriplasmin.
• • Treatment with Ozurdex (dexamethasone), Iluvien or Yutiq (fluocinolone 404 acetonide) intravitreal implant.
• The following medications and treatments are excluded within the specified timeframe:
• • Treatment with an ophthalmic oligonucleotide within the last 9 months (last treatment date is less than 9 months prior to Screening Visit date).
• • Treatment with any other product within five times the expected half-life of the product (time from last treatment date to Screening Visit date is at least 4115 times the half-life of the given product).
• • Treatment that can alter visual acuity between Screening and Baseline (e.g., periorbital injections.)