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Evaluation of the iris thickness changes for the Chinese families with GPR143 gene mutations.

Exp. Eye Res.2019 Dec;189:107819. Epub 2019 Sep 28
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摘要


PURPOSE:Pathogenic variants of the G-protein coupled receptor 143 (GPR143) gene may result in Ocular albinism type I (OA1). In this study, we describe the clinical features and investigate the GPR143 gene mutations in six Chinese families with OA1 and evaluate the thickness changes of iris for the affected males and female carriers. METHODS:Families were ascertained, and patients underwent complete ophthalmologic examinations, including the best corrected visual acuity (BCVA), anterior segment of the eyes, vitreous and fundus changes. Spectral domain optical coherence tomography (SD-OCT) was used to measure the full iris thickness, the stroma/anterior border (SAB) layer, and the posterior epithelial layer (PEL) at the pupillary and ciliary regions. DNA was extracted from the peripheral blood vessels after confirmed consent information. GPR143 gene was directly sequenced by the Sanger method. RESULTS:The affected males had variable reduced visual acuity, nystagmus and macular hypoplasia. Four novel frameshift mutations and two previously reported missense/nonsense mutations in the GPR143 gene were detected in these families. The thickness of the iris was significantly reduced at the ciliary region in the affected males, compared with that in the normal controls and the female carriers. CONCLUSIONS:Pathogenic variants in the GPR143 gene may disturb the normal melanogenesis in the pigmented tissues of the eye, result in macular hypoplasia, and alter the thickness of the iris.

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