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Related Experiment Video

Updated: May 9, 2025

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INTRAFAMILIAL VARIABILITY OF IMPG1 -ASSOCIATED VITELLIFORM DYSTROPHY.

Lilian Chan1, Mattie Adams2, Tomas S Aleman1

  • 1Department of Ophthalmology, Scheie Eye Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania ; and.

Retinal Cases & Brief Reports
|May 2, 2025
PubMed
Summary

A novel deletion in the IMPG1 gene was identified in two siblings with vitelliform macular dystrophy. Despite the shared genetic cause, they exhibited distinct lesion patterns, highlighting intrafamilial variability in this inherited retinal disorder.

Keywords:
AFVDIMPG1VMDadult-onset foveomacular vitelliform dystrophyinterphotoreceptor matrix proteoglycan 1macular dystrophyvitelliform

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Area of Science:

  • Ophthalmology
  • Genetics
  • Molecular Biology

Background:

  • Vitelliform macular dystrophies are inherited retinal disorders characterized by yellow, yolk-like deposits in the macula.
  • Mutations in the IMPG1 gene have been previously linked to vitelliform macular dystrophy phenotypes.
  • Understanding the genetic basis and clinical variability is crucial for diagnosis and management.

Purpose of the Study:

  • To investigate the clinical and multimodal imaging findings in two siblings with distinct vitelliform phenotypes.
  • To identify the genetic cause, specifically focusing on a novel deletion in the IMPG1 gene.

Main Methods:

  • A case series of two siblings presenting with vitelliform lesions.
  • Multimodal imaging including optical coherence tomography (OCT), fundus color, short-wavelength fundus autofluorescence (SW-FAF), and fluorescein angiography.
  • Genetic testing for inherited retinal disorders, including analysis of the IMPG1 gene.

Main Results:

  • Both siblings presented with bilateral vitelliform lesions, but with different topographical distributions.
  • The brother had single foveal lesions, while his sister had asymptomatic multifocal extrafoveal lesions.
  • Identical heterozygous deletion in exon 7 of the IMPG1 gene was identified in both siblings.

Conclusions:

  • A novel IMPG1 gene deletion in exon 7 is associated with vitelliform macular dystrophy.
  • The findings support the pathogenicity of IMPG1 variants in causing this condition.
  • Intrafamilial variability in lesion presentation suggests genetic modifiers influence disease expression.