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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Vibratome Sectioning Mouse Retina to Prepare Photoreceptor Cultures
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SNRNP200- Associated Retinopathy: In-Depth Clinical Phenotyping and Genetic Characterization.

Juan C Romo-Aguas1, Yannik Laich2, Angelos Kalitzeos1

  • 1From the UCL Institute of Ophthalmology (J.C.R.A., Y.L., A.K., T.A.C.D.G, A.G.R., K.F., Y.F.Y., M.G., O.A.M., A.R.W., M.M.), University College London, London, UK; Moorfields Eye Hospital NHS Foundation Trust (J.C.R.A., Y.L., A.K., T.A.C.D.G, A.G.R., K.F., O.A.M., A.R.W., M.M.), London, UK.

American Journal of Ophthalmology
|August 18, 2025
PubMed
Summary
This summary is machine-generated.

This study analyzed 34 patients with SNRNP200-associated retinopathy, revealing a slow decline in vision and retinal structure over time. Central retinal function remains largely preserved into the sixth decade of life.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Retinal Diseases

Background:

  • SNRNP200 mutations are linked to inherited retinal diseases.
  • Understanding the clinical spectrum and natural history is crucial for patient management.

Purpose of the Study:

  • To analyze the clinical spectrum and natural history of SNRNP200-associated retinopathy.
  • To characterize visual acuity, retinal structure, and electrophysiological findings in affected individuals.

Main Methods:

  • A multi-center retrospective, observational cohort study of 34 molecularly confirmed patients.
  • Longitudinal data collection including best-corrected visual acuity (BCVA), retinal imaging, and electrophysiology.
  • Genetic analysis to identify disease-causing variants in SNRNP200.

Main Results:

  • Median BCVA showed a slow decline (0.021 LogMAR/year) over a median follow-up of 6 years.
  • Ellipsoid zone width decreased by 21.9 µm/year, indicating structural changes.
  • Electrophysiology revealed rod-cone dystrophy with preserved macular function in most cases.
  • Eleven novel SNRNP200 variants were identified.

Conclusions:

  • This study represents the largest cohort of SNRNP200-associated retinopathy with the longest follow-up.
  • Longitudinal data indicate preserved central retina function until the sixth decade.
  • Findings offer critical insights for patient counseling, clinical endpoint identification, and therapeutic development.