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RHO-Associated Retinitis Pigmentosa: Genetics, Phenotype, Natural History, Functional Assays, and Animal Model - In

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Summary

This study details the largest cohort of RHO-associated retinitis pigmentosa (RP), revealing a wide spectrum of phenotypes and genetic variants. Findings link specific RHO gene variants to disease severity and progression, aiding patient care and therapeutic development.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Retinal Diseases

Background:

  • Retinitis Pigmentosa (RP) is a group of inherited retinal diseases.
  • RHO gene mutations are a known cause of RP.
  • Understanding RHO-associated RP is crucial for diagnosis and treatment.

Purpose of the Study:

  • To describe the largest cohort of RHO-associated RP to date.
  • To analyze the spectrum of phenotypes, variants, and natural history.
  • To investigate genotype-phenotype correlations in RHO-associated RP.

Main Methods:

  • Collected data from 200 patients with RHO variants.
  • Classified variants using functional assays, animal models, and literature.
  • Assessed clinical phenotypes via visual acuity, fundus examination, multimodal imaging (SD-OCT, FAF), and electrophysiology.
  • Evaluated disease progression through longitudinal analysis.

Main Results:

  • Identified 200 patients (140 families) with disease-causing RHO variants.
  • Found generalized RP in 64% and sector RP in 34.5% of cases.
  • Class 1 variants correlated with earlier onset, generalized RP, and poorer visual acuity.
  • Sector RP showed slower progression (0.01 LogMAR/year) than generalized RP (0.03 LogMAR/year).

Conclusions:

  • RHO-associated RP presents a diverse phenotypic spectrum.
  • Genetic subtypes significantly influence disease severity and progression.
  • Findings support improved patient counseling, clinical trial design, and therapeutic strategies.