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ABCA4深层内核变异导致了近一半未解决的Stargardt病例,具有较温和的表型

Yingwei Wang¹, Pangfeng Wang¹, Zhen Yi¹

¹State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China.

Investigative ophthalmology & visual science

|January 30, 2025

概括

在ABCA4中深层内在变异 (DIV) 导致近一半的Stargardt病 (STGD) 病例. 患有ABCA4 DIV的患者表现出较慢的疾病进展和较轻的底部变化,这表明潜在的治疗干预措施.

科学领域:

眼科医生眼科眼科
遗传学遗传学是一个
分子生物学分子生物学

背景情况:

斯塔格特病 (STGD) 是一种常见的遗传性黄斑变质症.
ABCA4基因变异是STGD的主要原因.
在ABCA4中,深层内因变异 (DIV) 导致STGD,但在遗传检测中经常被忽视.

研究的目的:

为了调查ABCA4深层内在变异 (DIV) 的流行率和临床影响,在一个患有Stargardt病 (STGD) 的中国队列中.
分析与ABCA4 DIVs相关的STGD的自然进展.
为了比较具有DIV的STGD患者与具有编码变异的患者的临床表型.

主要方法:

下一代测序用于检测未解决的STGD探针中的ABCA4 DIV.
使用in silico工具和迷你基因测试来评估已识别的DIV的拼接效应.
进行了全面的眼科检查,包括 fundus 摄影, fundus 自流光 (FAF) 和光学连贯性断层扫描血管学 (OCTA).
收集了长期随访数据,并比较了DIV患者和双代码变异患者之间的数据.

主要成果:

七个ABCA4 DIV,包括两个新型变异,在45%的未解决的STGD试验中被发现.
四个DIV被证实会影响拼接.
c.161-395G>A变异是最常见的DIV等位基因.
患有DIVs的患者最初表现出局部性黄斑病变,进展到扩大的黄斑病变,没有泛性视网膜变质.
与编码变体相比,DIV与较轻微的底部变化和较慢的病变发展有关.
OCTA发现了逐渐的毛细血管输液减少和亚RPE沉积物.

结论:

ABCA4 DIV占STGD病例的很大一部分,具有无法解释的遗传性.
患有ABCA4 DIV的患者表现出明显的,进展缓慢的临床表型.
剩余的正确拼接mRNA的水平可能会影响疾病的严重程度.
旨在增加正常ABCA4表达的策略可能是DIVs引起的STGD的潜在治疗途径.

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