与马里内斯科-肖格伦综合征相关的新型SIL1变体 (p.E342K) 损害了蛋白质稳定性和功能
Anna Giulia Ruggieri1,2, Nikolaos M Marinakis3,4, Laura Amodei1,2
1Department of Innovative Technologies in Medicine and Dentistry, "G. d'Annunzio" University of Chieti-Pescara, 66100 Chieti, Italy.
International journal of molecular sciences
|December 11, 2025
概括
马里内斯科-斯约格伦综合征 (MSS) 是一种罕见的神经肌肉疾病. 我们在一名患者身上发现了一种新的致病性SIL1变体 (p.E342K),为MSS机制和基因型-表型相关性提供了洞察力.
科学领域:
- 遗传学和分子生物学
- 神经学 神经学
- 罕见疾病 罕见疾病
背景情况:
- 马里内斯科 - 斯约格伦综合征 (MSS) 是一种罕见的自体递归神经肌肉疾病,其特征是缺氧,肌肉衰弱,白内障和智力/骨异常.
- 许多MSS通常是由SIL1基因的功能丧失变异引起的,这些变异会影响免疫球蛋白结合蛋白 (BiP) 功能,并导致蛋白质反应展开.
- 了解新型变异对于诊断和管理罕见遗传疾病至关重要.
研究的目的:
- 在患有典型的MSS症状的患者中识别和描述一种新的SIL1变异.
- 使用in silico,生物化学和细胞分析来确定鉴定变异的致病性.
- 阐明基因型-表型相关性和病原性机制,这些病原性机制是这种特定的MSS病例的基础.
主要方法:
- 整体外体测序 (WES) 用于识别遗传变异.
- 在 silico 预测中,循环二重化和原生凝电泳被用于评估结构变化.
- 来自患者的纤维细胞被分析了蛋白质水平,蛋白质组形状,转录特征和超结构特征.
主要成果:
- 一个以前未报告的SIL1变种,c.1024G>A (p.E342K),在一个患有MSS的2岁患者中被发现.
- 这种p.E342K变体表现出结构变化,纤维细胞中的Sil1蛋白水平降低 (部分通过蛋白质酶抑制挽救),以及典型的MSS超结构特征.
- 蛋白质组学和转录分析揭示了与已知的MSS病例一致的概况,支持该变体的致病性.
结论:
- 新型SIL1 p.E342K变种被归类为致病性,符合ACMG/AMP和ClinGen SVI指南.
- 这一发现扩大了导致MSS的SIL1变异的已知谱,并为基因型-表型相关性提供了洞察力.
- 这项研究深入了解了与SIL1功能障碍相关的MSS病原体背后的分子机制.
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