Clinical Evaluation of Patients With X-linked Retinitis Pigmentosa (XLRP)

Study Overview
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Brief Summary
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The purpose of this study is to evaluate subjects with X-linked retinitis pigmentosa caused by RPGR-ORF15 mutations in a clinical setting to fully characterize their condition, measure testing variability, and estimate rates of progression of clinical parameters.

Detailed Description
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Males with a clinical diagnosis of X-linked retinitis pigmentosa (XLRP) caused by RPGR-ORF15 mutations will be asked to provide informed consent and will have a single blood or saliva sample obtained for DNA sequence analysis of genes known to cause XLRP, including the RPGR-ORF15 gene. All participants will be informed of the results of testing for these mutations. Those with qualifying mutations in the RPGR-ORF15 gene will be evaluated every 6 months for 3 years using a variety of non-invasive visual function tests to more fully characterize their clinical condition. Testing will include routine ophthalmic examinations and tests of visual acuity, perimetry, OCT, fundus imaging, and completion of quality of life questionnaires.

Official Title
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Clinical Evaluation of Individuals With X-linked Retinitis Pigmentosa (XLRP) Caused by RPGR-ORF15 Mutations

Conditions
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X-Linked Retinitis Pigmentosa

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Male subjects with a clinical diagnosis of XLRP and a documented molecular diagnosis from a CLIA-certified laboratory of mutation within the ORF15 exon of the RPGR gene; At least 6 years of age; Willing and able to perform study procedures; Signed informed consent(s) obtained (and child assent where applicable). Exclusion Criteria: Pre-existing eye conditions that would interfere with interpretation of study endpoints (e.g. glaucoma, corneal or lenticular opacities, diabetic retinopathy, history of retinal detachment); Participating in an interventional research study of drugs or devices for treatment of XLRP or other retinal diseases; Monoocular participants Any condition which leads the investigator to believe that the participant cannot comply with the protocol requirements or that may place the participant at an unacceptable risk for participation.

Ages Eligible for Study
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Minimum Age: 6 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Disease progression in subjects with XLRP |  | Day 0 - Month 36 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Disease progression using visual acuity testing |  | Day 0 - Month 36 | 
| Disease progression using perimetry |  | Day 0 - Month 36 | 
| Disease progression using OCT |  | Day 0 - Month 36 | 
| Disease progression using electroretinography |  | Day 0 - Month 36 | 
| Disease progression using the National Eye Institute Visual Functioning Questionnaire-25 (VFQ-25) quality of life questionnaire |  | Day 0 - Month 36 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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XLRP, retinal degeneration, RPGR, ORF15