在各种分子方面,POU4F3变异的分支与自身主导性听力损失相关
Sang-Yeon Lee1,2,3, Min Young Kim4, Jin Hee Han4
1Department of Genomic Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea.
Scientific reports
|August 3, 2023
概括
在POU4F3基因中发现了四种新型变异,导致自体主导性聋 (DFNA15). 这些突变会影响蛋白质的稳定性,局部化和转录活性,影响内耳发育基因.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 耳鼻喉科 耳鼻喉科 耳鼻喉科
背景情况:
- POU4F3基因编码了一种转录因子,对内耳发育至关重要.
- POU4F3中的突变是已知的自体主导非综合征性听力损失的已知原因,特别是DFNA15.
- 了解POU4F3变体的分子后果对于阐明聋病原体至关重要.
研究的目的:
- 识别和描述与DFNA15.15相关的POU4F3基因中的新型变异.
- 研究这些POU4F3变体影响蛋白质功能的分子机制,包括表达,稳定性,局部化和转录活性.
- 探索这些变异对下游目标基因表达的影响,这与内耳发育有关.
主要方法:
- 使用外体序列测序来检测新的POU4F3变体.
- 进行了体外研究,以评估野生型和突变POU4F3蛋白质的蛋白质表达,稳定性和亚细胞局部化.
- 进行了转录活性测试,以评估变异对基因调节的影响.
- 使用患者衍生的淋巴体细胞系进行基因表达分析,用于识别改变的下游标.
主要成果:
- 已经确定了四种新的POU4F3变体 (c.564dupA,c.743T>C,c.879C>A,c.952G>A).
- 误解POU4F3突变体表现出减少表达和不稳定性,表明对降解的敏感性增加.
- 所有突变的POU4F3蛋白都显示出改变的亚细胞局部化,其中一种变异破坏了核局部化信号.
- 突变的POU4F3蛋白显著损害了转录活性,影响了参与内耳发育的14个下游基因的表达.
- 观察到患者衍生细胞和耳毛细胞的表达特征之间存在显著的相关性.
结论:
- 这项研究扩大了POU4F3相关的DFNA15.3已知的基因型谱.
- 鉴定到的POU4F3变异导致蛋白质不稳定,异常局部化和转录活性降低,导致听力损失.
- 使用患者衍生的淋巴细胞细胞系为研究内耳发育和POU4F3相关疾病提供了有价值的模型,克服了耳样本可访问性的局限性.
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