Genetic causes of nystagmus, foveal hypoplasia and subnormal visual acuity- other than albinism

Citation:

Ehrenberg M, Bagdonite-Bejarano L, Fulton AB, Orenstein N, Yahalom C. Genetic causes of nystagmus, foveal hypoplasia and subnormal visual acuity- other than albinism. Ophthalmic Genet 2021;:1-9.

Date Published:

2021 Feb 17

Abstract:

: To describe genetic molecular findings in individuals with congenital nystagmus, foveal hypoplasia, and subnormal vision, with normal ocular pigmentation (absence of diffuse transillumination or transparent retinal pigment typical for albinism). : This is a retrospective, multicenter study of ophthalmic, systemic, and genetic features, as collected from medical records of patients diagnosed with infantile nystagmus and foveal hypoplasia. Ophthalmic findings include best-corrected visual acuity (BCVA), biomicroscopic examination, cycloplegic refraction, retinal examination, macular optical coherence tomography, and electroretinography. Genetic information was retrieved from the participating genetic clinics and included ethnicity and molecular diagnosis. : Thirty-one individuals met the inclusion criteria and had a secure molecular diagnosis. Mutations in two genes predominated, constituting 77.4% of all the represented genes: (45.1%) and (32.3%). Seventy-eight percent of the subjects who had a measurable BCVA had moderate and severe visual impairment (range 20/80 to 20/270). Most patients with a mutation in had mild to moderate astigmatism, while most patients with mutation had moderate and severe myopia. Patients in the group had variable degrees of anterior segment manifestations. : In our cohort, the main causative genes for congenital nystagmus and foveal hypoplasia in normally pigmented eyes were and . A mild phenotype in mutations may be an under-diagnosed cause of nystagmus and foveal hypoplasia. Reaching an accurate genetic diagnosis is essential for both the patients and their family members. This enables predicting disease prognosis, tailoring correct follow-up, and providing genetic counseling and family planning to affected families.

Last updated on 02/28/2021