一种综合征性神经发育障碍,是由PPFIA3罕见变异引起的
Maimuna S Paul1, Sydney L Michener1, Hongling Pan2
1Department of Pediatrics, Section of Neurology and Developmental Neuroscience, Baylor College of Medicine, Houston, TX, USA; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA; Cain Pediatric Neurology Research Foundation Laboratories, Jan and Dan Duncan Neurological Research Institute, Houston, TX, USA.
American journal of human genetics
|January 5, 2024
概括
在PPFIA3基因的罕见变异导致发育障碍和影响突触形成. 果模型显示,这些PPFIA3变体充当主导负功能丧失等位基因,影响发育和突触功能.
科学领域:
- 神经遗传学 神经遗传学
- 发展生物学 发展生物学
- 分子神经科学 分子神经科学
背景情况:
- PPFIA3 (蛋白质-氨酸酸酶,受体类型,F-多交互蛋白-α-3) 是一个对突触发育和功能至关重要的素家族成员.
- 与PPFIA3功能障碍相关的人类疾病以前没有在OMIM中记录.
- 突触囊泡运输和突触前活性区组合是与PPFIA3.3相关的关键功能.
研究的目的:
- 研究PPFIA3罕见变异在人类神经发育障碍中的作用.
- 使用果模型在体内确定PPFIA3变异的致病性.
- 阐明PPFIA3变异对突触形成和发育过程的功能影响.
主要方法:
- 对20名患有罕见PPFIA3变异的个体进行临床评估,这些个体呈现神经发育表型.
- 在18个家族中鉴定了17种独特的PPFIA3变异.
- 转基因果的产生表达人类野生类型 (WT) PPFIA3和五个错误的变体,用于体内功能测试.
- 在果中进行过度表达和功能丧失测定,以评估PPFIA3变体的致病性和功能性保存.
主要成果:
- 20名患者出现发育迟缓,智力障碍,低血压,形状变异,头周长变化,自闭症特征和,与罕见的PPFIA3变异相关.
- 果过度表达试验显示,PPFIA3的N终端卷状卷状域的变异体表现出比C终端区域的变异体更强的表型.
- 中的功能丧失测定表明,的同卵性丧失Liprin-α导致胚胎死亡,部分由人类WT PPFIA3拯救,但不是由两个特定的变体,表明主导负的功能丧失效应.
结论:
- 罕见的PPFIA3变异与一系列神经发育障碍有关,包括智力障碍和.
- 人类的PPFIA3功能在果中部分保留,这是救援实验证明的.
- 已识别的PPFIA3变体作为主导负功能丧失等位基因,破坏发育过程和突触形成.
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