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在α₂δ-1和α₂δ-3中与自闭症相关的突变减少了蛋白质膜表达,但不影响通道或跨突触信号传递

Sabrin Haddad^1,2, Manuel Hessenberger¹, Cornelia Ablinger^1,2

¹Division of Physiology, Department of Pharmacology, Physiology, and Microbiology, Karl Landsteiner University of Health Sciences, 3500 Krems, Austria.

Pharmaceuticals (Basel, Switzerland)

|January 8, 2025

概括

与自闭症谱系障碍 (ASD) 相关的α2δ-1和α2δ-3蛋白质变异不会影响道功能. 这些突变可能会影响突触形成或神经网络,而不是经典的信号通路.

科学领域:

神经科学是一个神经科学.
遗传学是一个遗传学.
分子生物学分子生物学

背景情况:

α2δ蛋白 (电压通路的子单元) 对于神经元发育至关重要,包括轴突线路和突触形成.
罕见的CACNA2D1 (α2δ-1) 和CACNA2D3 (α2δ-3) 基因变异与自闭症谱系障碍 (ASD) 有关,但它们的致病性和潜在机制尚不清楚.

研究的目的:

在ASD患者中发现的两种异合体误解变异 (p.R351T在α2δ-1和p.A275T在α2δ-3) 的功能性特征.
研究这些变异对α2δ蛋白功能,膜表达和突触局部化的影响.

主要方法:

在tsA201细胞中进行电生理学记录,以评估道依赖的功能.
在培养的小鼠海马神经元中进行表达研究,以评估膜表达,前突触准和跨突触信号传递.

主要成果:

与野生类型相比,这两种突变的α2δ蛋白都显著减少了膜表达和突触局部化.
这种α2δ-3 A275T突变改变了糖化模式.
两种突变都没有影响相关通道 (CaV1.2,CaV1.3,CaV2.1) 的生物物理性质.
α2δ-1变体的前突触表达没有改变对GABA受体的跨突触信号传递.

结论:

研究的ASD相关的α2δ蛋白质变体似乎不会损害经典的通道依赖或跨突触功能.
这些发现表明,与这些变体相关的ASD病理生理学可能涉及突触形成或神经网络功能中更微妙的改变.
需要进一步的研究来开发ASD的α2δ蛋白结合疾病模型.

关键词:

自闭症谱系障碍自闭症谱系障碍辅助子单位辅助子单位目前正在进行的流.培养的海马神经元培养电力生理学电力生理学跨突触的功能是跨突触的功能.电压关闭通道的通道.

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