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在衰退性DNAJB4肌病症中的基因型-表型相关性
Michio Inoue1, Divya Jayaraman2,3, Rocio Bengoechea4
1Department of Neurology, Washington University School of Medicine, 4523 Clayton Avenue, Box 8111, Saint Louis, MO, 63110, USA. michio@wustl.edu.
Acta neuropathologica communications
|October 29, 2024
概括
DNAJB4基因中的致病变体导致一种罕见的肌肉病,其特征是早期呼吸衰竭和脊柱硬. 这项研究确定了新的DNAJB4变体,并突出了基因型-表型相关性,表明J-域误解变体预测了更严重的疾病过程.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 神经学 神经学
背景情况:
- 蛋白质聚合体肌肉病变是由蛋白质伴侣基因中的病原体变异引起的.
- DNAJB4,一种热冲击蛋白-40 (HSP40) 家族的可沙佩龙,对细胞蛋白质稳定至关重要.
- 递归的DNAJB4功能丧失变体会导致肌肉病,导致早期呼吸衰竭和脊柱硬.
研究的目的:
- 为了研究DNAJB4肌肉病的更广泛的临床和遗传谱.
- 在患者中识别DNAJB4的致病变体 无法解释的早期呼吸衰竭.
- 在DNAJB4相关肌肉病症中建立基因型-表型相关性.
主要方法:
- 在七名患有早期呼吸衰竭的患者身上进行了全外体测序.
- 在五个家族中确定了五种不同的致病性DNAJB4变体 (三种功能丧失,两种错误).
- 功能性测试,包括酵母补充和TDP-43分解,用于评估变异效应.
主要成果:
- 在五个无关家族中发现了五种新的致病性DNAJB4变异.
- 所有受影响的个体都对已识别的变体具有同胞性.
- 早期呼吸衰竭,刚性脊柱综合征,消化不良,脊椎病和心脏功能障碍是常见的症状.
- J域误解变异与更严重的表型,更早的发病和更高的死亡率相关.
结论:
- DNAJB4是脊椎硬化综合征的神经病变的新兴原因,表现出不同的发病和严重程度.
- 在有暗示症状的个体中,考虑DNAJB4肌病,特别是部硬或呼吸衰竭.
- 在J域中的误解变异可能预测更严重的临床表现和较差的结果.
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