Chiasmal Decussation in Oculo-Cutaneous Albinism Type 8.

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Tác giả: Rémi Barrois, Dominique Bremond-Gignac, Smaïl Hadj-Rabia, Sophie Javerzat, Vincent Michaud, Ester Moreno-Artero, Maxence Rateaux, Matthieu P Robert, Olivia Zambrowski

Ngôn ngữ: eng

Ký hiệu phân loại: 297.1248 Sources of Islam

Thông tin xuất bản: United States : Investigative ophthalmology & visual science , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 58714

PURPOSE: Albinism is a genetic disorder characterized by a defect in melanin biosynthesis. Ophthalmological and dermatological impairments vary according to the patient genotype and are highly heterogenous. Recently, variants in the DCT gene were showed to be responsible for a new type of oculocutaneous albinism (OCA) named OCA8. We report the ophthalmological, electrophysiological, and dermatological characteristics of three patients with genetically confirmed OCA8. METHODS: This is a retrospective study of three patients with OCA8. Complete dermatological, ophthalmological, and orthoptic examinations were performed with clinical exploration and multimodal imaging. Visual evoked potentials (VEPs) were performed to characterize chiasmal decussation in two of the three patients. RESULTS: The dermatological phenotype was mild, whereas all three patients exhibited infantile nystagmus syndrome with reduced visual acuity, foveal hypoplasia (grade 3), macular hypopigmentation (graded from 2 to 1), and iris transillumination (grade 3). Patients who could undergo a VEP examination exhibited signs of strong chiasmal misrouting. CONCLUSIONS: Recently, pathogenic variants in the DCT gene were proven to cause OCA. Whereas patients with OCA8 exhibit a milder dermatological phenotype than others, their vision was initially described as impaired. The present report confirms previous findings and suggests that chiasmal misrouting is present in OCA8. This, together with recent findings in the murine model, supports the hypothesis that DCT regulates levels of L-Dopa and downstream signaling in the developing retina. These results convey critical future therapeutic implications.
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