ArticleDocumenta ophthalmologica. Advances in ophthalmology2023
Electroretinogram abnormalities in FKRP-related limb-girdle muscular dystrophy (LGMDR9).
Article in Documenta ophthalmologica. Advances in ophthalmology, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT00313677 (Clinical Trial Readiness for the Dystroglycanopathies), which is not on this map. Cited by 2 papers.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Clinical Trial Readiness for the Dystroglycanopathies
Who cites it
2 citing papers in PubMed, 1 citations in OpenAlex.
- Review: Limb-girdle muscular dystrophies (LGMDs) existing registries and natural history studies: Where do we stand?Journal of neuromuscular diseases · 2026Review
- Standardization of zebrafish drug testing parameters for muscle diseases.Disease models & mechanisms · 2024Article
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Authors and funding
7 authors at 1 institution in 1 country.
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Abstract
backgroundDystroglycanopathies are a heterogeneous group of membrane-related muscular dystrophies. The dystroglycanopathy phenotype includes a spectrum of severity ranging from severe congenital muscular dystrophy to adult-onset limb-girdle muscular dystrophy (LGMD). LGMDR9 is a dystroglycanopathy caused by mutations in the FKRP gene. Previous studies have characterized electroretinogram findings of dystroglycanopathy mouse models but have not been reported in humans. PURPOSE: This study set out to characterize the electroretinogram in eight participants with LGMDR9.
methodsEight participants were recruited from an ongoing dystroglycanopathy natural history study at the University of Iowa (NCT00313677). Inclusion criteria for the current study were children and adults > 6 years old with confirmed LGMDR9. Age similar controls were identified from our electrophysiology service normative control database. Full-field electroretinograms were recorded using ISCEV standards. Six of the eight participants underwent light-adapted ON/OFF testing.
resultsThe electronegative electroretinogram was not seen in any participants with LGMDR9. An unusual sawtooth pattern in the 30 Hz flicker with faster rise than descent was noted in all 8 participants. Our cases showed a decreased b-wave amplitude in light-adapted ON responses (p = 0.011) and decreased d-wave amplitude in light-adapted OFF responses (p = 0.015). Decreased b-wave amplitude in light-adapted 3.0 testing (p = 0.015) and decreased flicker ERG amplitudes were also detected (p = 0.0018). Additionally, compared to controls, participants with LGMDR9 had decreased a-wave amplitudes on dark-adapted 10 testing (p = 0.026).
conclusionsAbnormal ON/OFF bipolar cell responses and sawtooth 30 Hz flicker waveforms on full-field electroretinogram may be specific for LGMDR9. If confirmed in a larger population and if related to disease stage, these tests are potential biomarkers which could be useful as endpoints in clinical treatment trials.
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