线粒体甲基转移酶基因NSUN3的突变会导致遗传光神经病变
Cansu de Muijnck1,2, Jacoline B Ten Brink3, Hugoline G de Haan4,5
1Department of Ophthalmology, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands.
Genes
|May 25, 2024
概括
基因测试发现了一种新型基因NSUN3,与遗传性视觉神经病变 (IONs) 相关,这是视力丧失的罕见原因. 这一发现扩大了无法解释的ION患者的诊断能力.
科学领域:
- 遗传学 是一个遗传学.
- 眼科医生 眼科 眼科
- 线粒体生物学 线粒体生物学
背景情况:
- 遗传性视神经病 (IONs) 是一种遗传性疾病,导致视神经逐渐缩和视力丧失.
- 目前的基因测试小组仅在40%的ION病例中得出诊断,许多患者遗传原因不明.
- 很大一部分ION病例仍未被诊断出来,这凸显了对新型遗传发现的需求.
研究的目的:
- 鉴定具有负面标准遗传检测的患者遗传性视神经病变的新型遗传原因.
- 研究NSUN3基因在视神经病变的发病过程中的作用.
- 评估三元全外体序列测序对诊断罕见遗传光神经病变的有用性.
主要方法:
- 一个临床诊断为ION和血缘亲属父母的试验者的案例研究.
- 基因分析包括下一代测序面板和家庭内隔离分析.
- 对患者衍生的纤维细胞进行功能研究,以评估NSUN3mRNA水平,线粒体复合体IV和细胞呼吸.
主要成果:
- 在试剂中发现了NSUN3基因中的同卵性致病变体 (c.349_352dup),与自身逆性遗传相一致.
- 患者的纤维细胞显示NSUN3mRNA水平降低,线粒体复合体IV降低,细胞呼吸受损.
- 已识别的NSUN3变种被认为是遗传性视神经病变的潜在新原因.
结论:
- NSUN3中的致病变体被认为是遗传性视神经病变的原因.
- 三个全外体序列测序是ION病例的有价值的诊断工具,常规基因测试呈阴性.
- 这项研究扩大了遗传性视神经病变的遗传景观,并提供了一条新的诊断途径.
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