Ocular phenotype and electroretinogram abnormalities in Lafora disease and correlation with disease stage

Alessandro Orsini, Daniele Ferrari, Antonella Riva, Andrea Santangelo, Angelo Macrì, Elena Freri, Laura Canafoglia, Alfredo D’Aniello, Giancarlo Di Gennaro, Gabriele Massimetti, Carlo Minetti, Federico Zara, Roberto Michelucci, Anupreet Tumber, Ajoy Vincent, Berge Arakel Minassian, Pasquale Striano

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Lafora disease (LD) is a neurodegenerative disorder featuring action and stimulus-sensitive myoclonus, epilepsy, and cognitive deterioration. Mutations in the EPM2A/EPM2B genes classically prove causative for the disease in most cases. Since full-field electroretinogram (ffERG) may reveal early-stage changes in a wide spectrum of diseases, we aimed to evaluate retinal cones and rods dysfunction in a cohort of Italian LD patients. Methods: Patients with genetically confirmed LD were recruited and subjected to ffERG analysis following the International Society for Clinical Electrophysiology of Vision (ISCEV) protocol. Results: Six patients aged between 13 and 26 years (mean 19.5 years) were included. The mean age at disease onset was 12.5 years with a mean disease duration of 7 years. The ffERG analysis revealed a global mild to severe generalized cones dysfunction in all patients. Linear correlation was identified between disease stage and the degree of cones and rods dysfunction, as well as between the type of mutation and the cones and rods dysfunction. Conclusions: This study brings further evidence of early retinal alterations in LD patients. The cones and rods dysfunction grade is related to disease duration. The ffERG is an important tool to determine the disease stage, allowing to evaluate either natural or treatment-related disease progression in a minimally invasive way.

Original languageEnglish (US)
JournalJournal of neurology
DOIs
StateAccepted/In press - 2022
Externally publishedYes

Keywords

  • FFERG
  • Lafora disease
  • Neurodegeneration
  • Progressive myoclonus
  • Retinal alterations

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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