星病相关的内框架ABCA4外子17跳转导致显著的ABCA4功能
Melita Kaltak1,2, Rocio Blanco-Garavito3, Laurie L Molday4
1Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands.
Journal of translational medicine
|August 16, 2023
概括
反感性寡核酸 (AONs) 可以诱导ABCA4基因中的外跳转,可能治疗斯塔格特病 (STGD1). 跳过ABCA4的第17个外显子保留了部分蛋白质活性,为STGD1患者提供了治疗策略.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 眼科医生 眼科 眼科
背景情况:
- 星病 (STGD1) 与ABCA4基因的突变有关.
- 在ABCA4相关的STGD1中框架内外跳跃的作用尚未完全理解.
- 反感性寡核酸 (AONs) 在遗传性疾病中对调节基因表达具有前景.
研究的目的:
- 为了研究跳过ABCA4基因中的第17个外显子的功能影响.
- 开发能够诱导在ABCA4.4中诱导异子17跳转的AONs.
- 评估AON介导的对STGD1.1的外跳转的治疗潜力.
主要方法:
- 分析了一名具有拼接变异 (c.2653+1G>A) 的STGD1患者,导致17个外显子跳转.
- 在HEK293T细胞中使用中间基因进行了体外剪接试验.
- 评估了由此产生的ABCA4蛋白变体的ATPase活性和亚细胞局部.
- AONs的设计和测试是为了确定它们在诱导细胞系和视网膜有机体中的外子17跳转中的有效性.
主要成果:
- 这种c.2653+1G>A变种已证实在框架内跳过ABCA4 17.
- 缺少17个表原体 (Asp864_Gly885del) 的ABCA4保留了正常ATPase活性的58%,并且是稳定的.
- 最好的AON候选人在人类视网膜有机体中实现了59%的外17跳转.
结论:
- 删除ABCA4第17个外基因并不会取消蛋白质活性,并且可能不会在与零等位基因结合时导致严重的STGD1.
- 通过AON介导的外因子跳转是一种可行的策略,可以潜在地改善STGD1.1中严重的ABCA4变体的影响.
- 这种方法可以恢复STGD1患者的部分ABCA4功能.
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