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Genetics, Clinical Characteristics, and Natural History of PDE6B-Associated Retinal Dystrophy
Shaima Awadh Hashem1, Michalis Georgiou2, Yu Fujinami-Yokokawa3
1From the Moorfields Eye Hospital (S.A.H., M.G., Y.L., M.D.V., T.A.C.d.G., N.A., O.A.M., A.R.W., K.F., M.M.), London, United Kingdom; UCL Institute of Ophthalmology, University College London (S.A.H., M.G., Y.F.Y., Y.L., M.D.V., T.A.C.d.G., O.A.M., A.R.W., K.F., M.M.), London, United Kingdom.
American Journal of Ophthalmology
|February 16, 2024
Summary
This study of PDE6B-associated retinal dystrophy in 40 patients reveals a slowly progressive disease with mild visual acuity loss. Findings suggest a wide window for therapeutic intervention due to disease symmetry.
Area of Science:
- Ophthalmology
- Genetics
- Retinal Dystrophies
Background:
- Phosphodiesterase 6B (PDE6B) gene mutations are linked to retinal dystrophies.
- Understanding the clinical course and genetic basis of PDE6B-retinopathy is crucial for patient management.
Purpose of the Study:
- To analyze the clinical characteristics, natural history, and genetics of PDE6B-associated retinal dystrophy.
- To establish the largest cohort to date for PDE6B-retinopathy.
Main Methods:
- Retrospective, observational cohort study of 40 patients with molecularly confirmed PDE6B-retinopathy.
- Longitudinal evaluation including best-corrected visual acuity (BCVA), fundus autofluorescence (FAF), and spectral-domain optical coherence tomography (SD-OCT).
- Comprehensive genetic analysis to identify and assess PDE6B variants.
Main Results:
- Mean age at baseline was 42.1 years, with a mean follow-up of 5.2 years.
- Most patients (72.5%) had mild or no BCVA impairment; disease progression was slow, with symmetrical visual acuity in 87.5%.
- FAF showed a hyperautofluorescent ring, and SD-OCT revealed ellipsoid zone thinning and cystoid macular edema, with statistically significant changes over time. 16 novel PDE6B variants were identified.
Conclusions:
- PDE6B-retinopathy is characterized by slow progression and mild visual acuity loss.
- High disease symmetry and identifiable imaging biomarkers suggest a potential for early intervention.
- This study provides comprehensive insights into the natural history and genetics of PDE6B-retinopathy.
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