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Repurposing Drug Metabolites into Dual β-Adrenergic Receptor-Carbonic Anhydrase Modulators as Potential Tools for Ocular Disorders.

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Progressive Cone-Rod Dystrophy and RPE Dysfunction in Mitf Mice.

Andrea García-Llorca1, Knútur Haukstein Ólafsson1, Arnór Thorri Sigurdsson1

  • 1Department of Physiology, Faculty of Medicine, University of Iceland, 101 Reykjavík, Iceland.

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Summary

Mice with mutations in the microphthalmia-associated transcription factor (Mitf) gene develop progressive cone-rod dystrophy and retinal pigment epithelium (RPE) dysfunction, offering a new model for human retinal diseases.

Keywords:
ERGMitfRPEc-wavecone-rod dystrophyfundus photographyinherited retinal disordersmouse modelsretina

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Area of Science:

  • Genetics
  • Ophthalmology
  • Developmental Biology

Background:

  • Mutations in the microphthalmia-associated transcription factor (Mitf) gene impact retinal pigment epithelium (RPE) development, causing hypopigmentation, microphthalmia, deafness, and blindness.
  • Loss-of-function Mitf mutations are linked to human retinal diseases like Waardenburg and Tietz syndromes.
  • While homozygous Mitf mutations in mice cause microphthalmia and osteopetrosis, the ocular effects of heterozygous mutations are less understood.

Purpose of the Study:

  • To investigate the ocular effects of heterozygous Mitf gene mutations in mice.
  • To characterize the progressive changes in retinal function and structure associated with Mitf mutations.
  • To establish a mouse model for studying human retinal diseases linked to Mitf.

Main Methods:

  • Characterization of Mitf mutant mice at 1, 3, 12, and 18 months of age.
  • Comparison with age-matched wild-type mice.
  • Electroretinogram (ERG) recordings (light- and dark-adapted) and histological retinal analysis.

Main Results:

  • Progressive cone-rod dystrophy was observed in Mitf mutant mice, evidenced by ERG recordings.
  • Reduced RPE response was detected in Mitf mice across all studied age groups.
  • Progressive retinal pigment loss and retinal degeneration were observed in older Mitf mice.

Conclusions:

  • Mitf mutant mice serve as a valuable model for progressive cone-rod dystrophy and RPE dysfunction.
  • This study provides the first report of a mouse model exhibiting these specific phenotypes due to an Mitf gene mutation.
  • Findings contribute to understanding the role of Mitf in retinal development and disease pathogenesis.