Institute of Medical Molecular Genetics, University of Zürich, Wagistrasse 12, CH-8952, Schlieren, Switzerland.
Department of Ophthalmology, University Hospital Zürich and University of Zürich, Zürich, Switzerland.
Sci Rep. 2016 Jun 29;6:28755. doi: 10.1038/srep28755.
Inherited monogenic diseases of the retina and vitreous affect approximately 1 in 2000 individuals. They are characterized by tremendous genetic heterogeneity and clinical variability involving mutations in approximately 250 genes and more than 20 different clinical phenotypes. Clinical manifestations of retinal dystrophies (RDs) range from mild retinal dysfunctions to severe congenital forms of blindness. A detailed clinical diagnosis and the identification of causative mutations are crucial for genetic counseling of affected patients and their families, for understanding genotype-phenotype correlations and developing therapeutic approaches. Using whole exome sequencing (WES) we have established a reliable and efficient high-throughput analysis pipeline to identify disease-causing mutations. Our data indicate that this approach enables us to genetically diagnose approximately 64% of the patients (n = 58) with variant(s) in known disease-associated genes. We report 20 novel and 26 recurrent variants in genes associated with RDs. We also identified a novel phenotype for mutations in C2orf71 and provide functional evidence for exon skipping due to a splice-site variant identified in FLVCR1. In conclusion, WES can rapidly identify variants in various families affected with different forms of RDs. Our study also expands the clinical and allelic spectrum of genes associated with RDs in the Swiss population.
遗传性视网膜和玻璃体的单基因疾病影响大约每 2000 人中的 1 人。它们的特点是遗传异质性和临床表现的巨大变异性,涉及大约 250 个基因和 20 多种不同的临床表型的突变。视网膜营养不良(RDs)的临床表现范围从轻微的视网膜功能障碍到严重的先天性失明。详细的临床诊断和致病突变的鉴定对于受影响患者及其家属的遗传咨询、理解基因型-表型相关性以及开发治疗方法至关重要。我们使用全外显子组测序(WES)建立了一种可靠和高效的高通量分析管道,以识别致病突变。我们的数据表明,这种方法使我们能够对大约 64%(n=58)已知疾病相关基因中有变异的患者进行基因诊断。我们报告了与 RDs 相关基因中的 20 个新变异和 26 个重复变异。我们还鉴定了 C2orf71 突变的新表型,并为 FLVCR1 中鉴定的剪接位点变异导致的外显子跳跃提供了功能证据。总之,WES 可以快速识别不同形式的 RDs 患者的变异。我们的研究还扩展了瑞士人群中与 RDs 相关的基因的临床和等位基因谱。
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