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Chiasmal Decussation in Oculo-Cutaneous Albinism Type 8.

Maxence Rateaux^1,2, Smaïl Hadj-Rabia³, Rémi Barrois²

¹Ophthalmology Department and Reference Centre for Rare Ophthalmology Diseases, (OPHTARA), ERN-Eye, University Hospital Necker-Enfants Malades, APHP, Paris, France.

Investigative Ophthalmology & Visual Science

|February 14, 2025

Summary

Oculocutaneous albinism type 8 (OCA8), caused by DCT gene variants, presents with mild skin issues but significant vision problems including infantile nystagmus and foveal hypoplasia. Chiasmal misrouting is a key finding in OCA8 patients.

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Area of Science:

Genetics
Ophthalmology
Dermatology

Background:

Albinism is a genetic disorder affecting melanin production, leading to varied ophthalmological and dermatological issues.
Recent research identified variants in the DCT gene as a cause of a specific type of oculocutaneous albinism, designated OCA8.

Purpose of the Study:

To detail the ophthalmological, electrophysiological, and dermatological characteristics of three patients diagnosed with OCA8.
To investigate the clinical manifestations associated with DCT gene variants in oculocutaneous albinism.

Main Methods:

Retrospective analysis of three genetically confirmed OCA8 patients.
Comprehensive dermatological, ophthalmological, and orthoptic examinations.
Visual evoked potentials (VEPs) to assess chiasmal pathway function in two patients.

Main Results:

Patients displayed mild dermatological phenotypes but significant visual impairments, including infantile nystagmus, reduced visual acuity, foveal hypoplasia, macular hypopigmentation, and iris transillumination.
VEP examinations revealed evidence of substantial chiasmal misrouting in affected individuals.

Conclusions:

Confirms DCT gene variants cause OCA8, characterized by milder skin symptoms but notable visual deficits.
Suggests chiasmal misrouting is a consistent feature of OCA8, supporting the role of DCT in retinal development and signaling.
Findings have potential implications for future therapeutic strategies targeting DCT-related albinism.