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Retinal dysfunction characterizes subtypes of dominant optic atrophy.

Maria Lucia Cascavilla1, Vincenzo Parisi2, Giacinto Triolo1

  • 1Scientific Institute San Raffaele Via Olgettina, Milan, Italy.

Acta Ophthalmologica
|September 20, 2017
PubMed
Summary
This summary is machine-generated.

Dominant optic atrophy (DOA) patients show reduced retinal function, particularly with missense mutations. Multifocal electroretinogram (mfERG) reveals significant preganglionic retinal impairment linked to OPA1 gene mutations.

Keywords:
OPA1 genedominant optic atrophymultifocal electroretinogramphotoreceptorsretinal topography

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Area of Science:

  • Ophthalmology
  • Genetics
  • Neuroscience

Background:

  • Dominant optic atrophy (DOA) is a primary mitochondrial optic neuropathy.
  • The OPA1 gene is a key factor in mitochondrial dynamics and is implicated in DOA.
  • Assessing preganglionic retinal function is crucial for understanding DOA's impact.

Purpose of the Study:

  • To evaluate preganglionic retinal function in dominant optic atrophy (DOA) patients.
  • To stratify retinal function based on OPA1 gene mutation type (missense vs. haploinsufficiency).
  • To correlate genotype with the severity of retinal dysfunction using multifocal electroretinogram (mfERG).

Main Methods:

  • mfERG was performed on 18 DOA patients and 25 healthy controls.
  • DOA patients were categorized into missense (DOA-M) and haploinsufficiency (DOA-H) mutation groups.
  • N1-P1 response amplitude density (RAD) was analyzed across eccentric retinal rings and sectors.

Main Results:

  • DOA patients exhibited significantly reduced N1-P1 RADs in central and peripheral retinal areas compared to controls.
  • The DOA-M group showed more widespread and severe reductions in N1-P1 RADs across all retinal regions.
  • The DOA-H group displayed significant reductions primarily in the central (R1) and nasal-superior (NS) sectors.

Conclusions:

  • Preganglionic retinal dysfunction is a consistent finding in dominant optic atrophy.
  • A clear association exists between OPA1 gene genotype and the pattern of retinal dysfunction.
  • Missense OPA1 mutations are associated with a more severe degree of retinal functional impairment in DOA.