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X-Linked Retinoschisis: Phenotypic Variability in a Chinese Family.

ABSTRACT: X-linked juvenile retinoschisis (XLRS), a leading cause of juvenile macular degeneration, is characterized by a spoke-wheel pattern in the macular region of the retina and splitting of the neurosensory retina. Our study is to describe the clinical characteristics of a four generations of this family (a total of 18 members)with X-linked retinoschisis (XLRS) and detected a novel mutations of c.3G?>?A (p.M1?) in the initiation codon of the RS1 gene. by direct sequencing.Identification of this mutation in this family provides evidence about potential genetic or environmental factors on its phenotypic variance, as patients presented with different phenotypes regardless of having the same mutation. Importantly, OCT has proven vital for XLRS diagnosis in children.

SUBMITTER: Xiao Y

PROVIDER: S-EPMC4731765 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature

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X-Linked Retinoschisis: Phenotypic Variability in a Chinese Family.

Xiao Yangyan Y Liu Xiao X Tang Luosheng L Wang Xia X Coursey Terry G TG Guo Xiaojian X Li Zhuo Z

Scientific reports 20160129

X-linked juvenile retinoschisis (XLRS), a leading cause of juvenile macular degeneration, is characterized by a spoke-wheel pattern in the macular region of the retina and splitting of the neurosensory retina. Our study is to describe the clinical characteristics of a four generations of this family (a total of 18 members)with X-linked retinoschisis (XLRS) and detected a novel mutations of c.3G > A (p.M1?) in the initiation codon of the RS1 gene. by direct sequencing.Identification of this mutat ...[more]

PMID: 26823236

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X-linked juvenile retinoschisis: phenotypic and genetic characterization.

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Project description:X-linked retinoschisis is the leading cause of macular degeneration in males and leads to splitting within the inner retinal layers leading to visual deterioration. Many missense and protein truncating mutations have now been identified in the causative retinoschisis gene (RS1) which encodes a 224 amino acid secretory retinal protein, retinoschisin. Retinoschisin octamerisation is implicated in cell-cell interactions and cell adhesion perhaps by interacting with beta2 laminin. Mutations cause loss of retinoschisin function by one of the three mechanisms: by interfering with protein secretion, by preventing its octamerisation or by reducing function in the secreted octamerised protein. The development of retinoschisis mouse models have provided a model system that closely resembles the human disease. Recent reports of RS1 gene transfer to these models and the sustained restoration of some retinal function and morphology suggest gene replacement may be a possible future therapy for patients.

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Deciphering the modifiers for phenotypic variability of X-linked adrenoleukodystrophy.

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Novel mutations of the RS1 gene in a cohort of Chinese families with X-linked retinoschisis.

Project description:PurposeX-linked retinoschisis is a retinal dystrophy caused by mutations in the RS1 gene in Xp22.1. These mutations lead to schisis (splitting) of the neural retina and subsequent reduction in visual acuity in affected men (OMIM # 312700). The aim of this study was to identify the RS1 gene mutations in a cohort of Chinese patients with X-linked retinoschisis, and to describe the associated phenotypes.MethodsPatients and unaffected individuals from 16 unrelated families underwent detailed ophthalmic examinations. After informed consent was obtained, genomic DNA was extracted from the venous blood of all participants. All exons including the exon-intron boundaries of the RS1 gene, were amplified by PCR and the products were analyzed by direct sequencing. Long-range PCR followed by DNA sequencing was used to define the breakpoints of the large deletion.ResultsSixteen male individuals from 16 families were diagnosed with retinoschisis by clinical examination. The median age at review was 13.2 years (range: 5-34 years); the median best-corrected visual acuity upon review was 0.26 (range 0.02-1.0). Foveal schisis was found in 82.8% of the eyes (24/29) while peripheral schisis was present in 27.5% of the eyes (8/29). Sequencing of the RS1 gene identified 16 mutations, nine of which were novel. The mutations included eight missense mutations, all located in exons 4-6 (50.0%), two nonsense mutations (12.5%), four small deletions or insertions (25.0%), one splice site mutation (6.25%), and one large genomic deletion that included exon1 (6.25%).ConclusionsThe mutations found in our study broaden the spectrum of RS1 mutations. The identification of the specific mutation in each pedigree will allow future determination of female carrier status for genetic counseling purposes.

| S-EPMC3913487 | biostudies-literature

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