Acta Neuropathologica:重复扩增骨骼肌疾病的多组学分析

2020-07-19 MedSci原创 MedSci原创

四代家族中22名个体患有染色体19p13.3关联的常染色体显性进行性肌病,他们具有独特的病理学特征。。本病的特点是在突变蛋白逐渐积累的部位,显性遗传性逐渐增强聚集性,这表明突变可能通过错误折叠导致聚集

四代家族中22名个体患有染色体19p13.3关联的常染色体显性进行性肌病,他们具有独特的病理学特征。。本病的特点是在突变蛋白逐渐积累的部位,显性遗传性逐渐增强聚集性,这表明突变可能通过错误折叠导致聚集,超过聚集能力。不断形成和融合失败的吞噬囊泡可能导致更大的液泡,破坏肌纤维的组织和改变其收缩能力,导致萎缩。本文的目的即对此进行多组学分析。

对其中最年轻的患者进行分组,并对6位患者进行重复关联分析,包含含164个基因的5.12 Mb的单倍型。免疫组化检查显示患者的液泡和浆膜下区域分别对泛素化蛋白和自噬的FK2和p62/SQSTM1标记物呈阳性。染色纤维的数量与临床严重程度相关。为了查询FK2靶点,我们对空泡和未受影响的肌纤维部分进行了显微解剖,以进行定量质谱分析。在700多种已鉴定的蛋白质中。紫苏脂素-4在液泡中的比例最高(几乎是对照肌纤维区的20倍)。紫苏脂素包裹在脂质滴周围的磷脂单层,并调节磷脂单层。紫苏脂素-4是肌肉中表达最丰富的紫苏脂素,尽管如此,除了降低心脏三酰甘油水平外,在小鼠体内缺乏它不会导致心脏、骨骼肌或其他损伤。

紫苏苷-4与α-突触核蛋白和可交换脂蛋白(ApoA、ApoC和ApoE)具有两亲结构域结构。家族性帕金森病和淀粉样变病中α-突触核蛋白和载脂蛋白A1的所有已知突变分别定位于这些蛋白质的两亲区,并将这些结构域的重复螺旋转化为淀粉样蛋白β褶皱。基因组重复序列容易扩展。本文首次报道两亲结构域在疾病中的重复扩张,并且只有通过长测序才能确定这种扩展。在相关疾病中,具有这些结构域的蛋白质可能发生种系或体细胞致病性两亲区重复扩增。

原文链接:

Ruggieri, A., Naumenko, S., Smith, M.A. et al. Multiomic elucidation of a coding 99-mer repeat-expansion skeletal muscle disease. Acta Neuropathol 140, 231–235 (2020). https://doi.org/10.1007/s00401-020-02164-4

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    2021-01-25 windight
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    2021-01-23 yb6560
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    2020-07-20 海明明

    挺好

    0

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