Usher syndrome in the United Arab Emirates.

IF 1.2 4区 医学 Q4 GENETICS & HEREDITY
Arif O Khan
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引用次数: 0

Abstract

Purpose: Usher syndrome, a common form of syndromic inherited retinal dystrophy in the Arabian Gulf, has not been molecularly defined in the United Arab Emirates. The current study addresses this gap in knowledge.

Methods: A retrospective case series of Emirati patients referred to the Ocular Genetics Clinic of Cleveland Clinic Abu Dhabi who (1) were clinically diagnosed with Usher syndrome and underwent genetic testing (whole exome sequencing, 2019 to 2023, inclusive) and (2) were identified to have biallelic pathogenic variants in Usher syndrome genes during the same time period.

Results: Ten probands (thirteen patients) were identified-seven probands (nine patients) with clinically diagnosed Usher syndrome and three additional probands (four patients) with biallelic homozygous USH2A variants. Among the seven probands initially diagnosed with Usher syndrome, six had different homozygous variants (three in MYO7A, one in ADGRV1, and one in CLRN1), one had dual diagnoses rather than Usher syndrome (i.e. separate cause for retinal dystrophy and deafness), and one had no identifiable genetic cause. Regarding the three additional probands identified with homozygous USH2A variants, all three had retinitis pigmentosa only rather than Usher syndrome and all three had different variants.

Discussion: Clinically diagnosed Usher syndrome was genetically heterogenous without evidence for founder effect in this Emirati cohort. MYO7A was the most common associated gene. Dual diagnosis rather than single cause can mimic Usher syndrome. Homozygous USH2A variants were not identified as a cause for Usher syndrome in this cohort but were a recurrent cause for retinitis pigmentosa without hearing impairment and without founder effect.

阿拉伯联合酋长国的乌谢尔综合征。
目的:Usher 综合征是阿拉伯海湾地区常见的一种综合遗传性视网膜营养不良症,但阿拉伯联合酋长国尚未对其进行分子鉴定。本研究正是为了填补这一知识空白:方法:对转诊至阿布扎比克利夫兰诊所眼遗传学门诊的阿联酋患者进行回顾性病例系列研究,这些患者(1)被临床诊断为乌谢尔综合征,并接受了基因检测(全外显子组测序,2019 年至 2023 年,含 2019 年);(2)在同一时期内被确定具有乌谢尔综合征基因的双倍性致病变体:结果:共鉴定出 10 名疑似患者(13 名患者)--其中 7 名疑似患者(9 名患者)经临床诊断患有乌谢尔综合征,另外 3 名疑似患者(4 名患者)患有双倍同型 USH2A 变异。在最初被诊断为乌谢尔综合征的七名受试者中,六名有不同的同源变异(三个在 MYO7A,一个在 ADGRV1,一个在 CLRN1),一名有双重诊断而非乌谢尔综合征(即视网膜营养不良和耳聋的不同病因),一名没有可确定的遗传病因。至于另外三个被鉴定为USH2A同源变体的患者,三人都只患有视网膜色素变性症,而不是乌谢尔综合征,而且三人都有不同的变体:讨论:临床诊断出的乌谢尔综合征具有遗传异质性,在这个阿联酋队列中没有证据表明存在创始人效应。MYO7A 是最常见的相关基因。双重诊断而非单一病因可诱发乌谢尔综合征。在该队列中,高通量 USH2A 变体未被确定为导致乌谢尔综合征的病因,但却是导致无听力障碍的视网膜色素变性症的复发病因,且无始祖效应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ophthalmic Genetics
Ophthalmic Genetics 医学-眼科学
CiteScore
2.40
自引率
8.30%
发文量
126
审稿时长
>12 weeks
期刊介绍: Ophthalmic Genetics accepts original papers, review articles and short communications on the clinical and molecular genetic aspects of ocular diseases.
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