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Early visual function impairment in CADASIL.

V Parisi1, F Pierelli, F Fattapposta

  • 1Clinica Oculistica Università Tor Vergata, Rome, Italy. vparisi@tin.it

Neurology
|June 25, 2003
PubMed
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Genetic analysis revealed Notch3 mutations in asymptomatic individuals with CADASIL, showing retinal layer dysfunction. This suggests early vascular changes in CADASIL may precede clinical symptoms.

Area of Science:

  • Neuroscience
  • Genetics
  • Ophthalmology

Background:

  • Cerebral Autosomal Dominant Arteriopathy with Subcortical Infarcts and Leukoencephalopathy (CADASIL) is a genetic disorder affecting small blood vessels in the brain.
  • Early detection of CADASIL is crucial for managing the disease and preventing severe neurological complications.
  • Retinal vascular changes may serve as an early indicator of systemic vascular disease.

Purpose of the Study:

  • To investigate potential early signs of CADASIL in asymptomatic offspring of affected individuals.
  • To correlate genetic findings with electrophysiologic evaluations of the visual system.
  • To determine if retinal dysfunction precedes clinical manifestation of CADASIL.

Main Methods:

  • Genetic analysis was performed to identify mutations in the Notch3 gene.

Related Experiment Videos

  • Visual electrophysiologic evaluations, including assessments of retinal layers and neural conduction, were conducted.
  • Participants included six asymptomatic children of patients with symptomatic CADASIL.

    • Main Results:

    • Three subjects with the Notch3 Cys146Tyr missense mutation exhibited dysfunction in outer, middle, and innermost retinal layers.
    • Normal neural conduction in postretinal visual pathways was observed in these subjects.
    • No electrophysiologic abnormalities were found in subjects without the genetic mutation.

    Conclusions:

    • The Notch3 Cys146Tyr mutation is associated with specific retinal layer dysfunction in asymptomatic individuals.
    • Early vascular impairment in the retina may be an indicator of CADASIL before clinical symptoms appear.
    • Electrophysiologic evaluation of the retina can aid in the early detection of CADASIL.