对导致阿尔波特综合征的两种COL4A5基因变异的遗传和分子动力学分析
Lei Liang1, Haotian Wu2, Zeyu Cai3
1Center for Prenatal Diagnosis and Medical Genetics, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010015, PR China.
BMC medical genomics
|August 18, 2023
概括
这项研究确定了两种新的基因变异,c.4414delG和c.4298-20T>A,在与X链接阿尔波特综合征 (XLAS) 相关的COL4A5基因中. 这些发现扩大了已知的XLAS遗传原因,并突出了分子动态在理解疾病机制方面的实用性.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 阿尔波特综合征 (AS) 是一种进展性遗传性病,伴有听力和视力并发症.
- 它呈现出三种亚型:X链接 (XLAS),自体衰退 (ARAS) 和自体主导 (ADAS),由遗传模式决定.
- XLAS是由COL4A5基因的变异引起的,而ARAS和ADAS则分别来自COL4A3和COL4A4基因的变异.
研究的目的:
- 识别和描述与X链接阿尔波特综合征 (XLAS) 相关的新型遗传变异.
- 调查已识别的变异对原IV三元化的功能影响.
- 评估分子动力学模拟在理解AS病变发生过程中的有用性.
主要方法:
- 在两个患有AS的中国患者身上进行了exome和Sanger测序.
- 使用Minigene拼接试验来评估拼接变异对COL4A5mRNA合成的影响.
- 用分子动力学模拟来预测变体对α345(IV) 三重螺旋形成的影响.
主要成果:
- 在COL4A5基因中发现了两种新型变异:一个删除 (c.4414delG) 和一个拼接变异 (c.4298-20T>A).
- 删除变异导致了一个截断的α5(IV) 链 (p.D1472Mfs),而拼接变异导致了内子保留 (p.(P1432_G1433insDYFVEI)).
- 分子动力学模拟表明,c.4414delG显著破坏了NC1三分化,超过c.4298-20T>A,与观察到的临床表型相关.
结论:
- 在XLAS患者中,COL4A5基因中发现了两种新型致病变体c.4414delG和c.4298-20T>A.
- 这些发现扩大了已知的XLAS遗传谱.
- 分子动力学模拟提供了一种有价值的方法,用于建模基因变异对原蛋白IV三元化的影响,并了解XLAS病原性.
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