四名心肌病患者患有异合体的DSG2 p.Arg119Ter变体
Takuya Sumida1, Shou Ogawa2, Shuichiro Higo3
1Faculty of Medicine, Osaka University, Suita, Osaka, 565-0871, Japan.
Human genome variation
|December 20, 2024
概括
与心律失常心肌病相关的异合体DSG2 p.Arg119Ter变体在心力衰竭患者中更为常见. 这种desmoglein-2变体损害了desmosome功能,可能会恶化心肌收缩性和疾病进展.
科学领域:
- 心血管遗传学 心血管遗传学
- 分子心脏病学分子心脏病学
- 细胞生物学 细胞生物学
背景情况:
- 德斯莫格林-2 (DSG2) 涉及到心律失常性心肌病变.
- 异性DSG2变体,特别是p.Arg119Ter在心肌病中的作用尚不清楚.
- 之前的研究在患有青少年发病心肌病的患者中发现了同卵性DSG2变体.
研究的目的:
- 调查非缺血性心肌病症患者中异合体DSG2 p.Arg119Ter变异的流行率和病理意义.
- 探索这种变异对德斯莫体结构和心肌细胞功能的影响.
- 为了确定DSG2变体是否有助于心力衰竭的进展.
主要方法:
- 808名患有非血型心肌病的患者的基因分析.
- 临床诊断和评估左心室功能.
- 内心肌活检样本的免疫组织化学分析.
- 心肌组织的传输电子显微镜.
- 诱导多能干细胞衍生心肌细胞 (iPSC-CMs) 的微力测试与DSG2变体.
主要成果:
- 四名患有心肌病的非相关患者携带异构体DSG2 p.Arg119Ter变体,其等位基频率明显高于一般人群.
- 患者出现了各种心肌病变,包括心律失常性右心室心肌病变和扩张心肌病变,以及左心室功能减弱.
- 在患有该变异的患者和iPSC-CM中观察到desmoglein-2和desmoplakin的减少表达,异常的desmosome结构和心肌细胞收缩能力受损.
- 在一些患者中发现了DSG2和BAG3的其他潜在的致病变体.
结论:
- 异合体的DSG2 p.Arg119Ter变体与心肌病和心力衰竭有关,这表明它可能是一个隐藏的危险因素.
- DSG2变体可能导致德斯莫索姆功能障碍,导致心肌收缩能力受损和疾病进展.
- 德斯莫索姆损伤代表了特定心肌病的潜在治疗标.
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