一种致病性AMPA受体门突变破坏了突触-线粒体轴,并阻碍了突触成熟
bioRxiv : the preprint server for biology
|February 9, 2026
概括
AMPA受体 (AMPARs) 的突变通过破坏突触发育并导致海马体内的线粒体应激导致神经发育障碍. 这项研究揭示了改变激发信号和大脑功能受损之间的联系.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- AMPA受体 (AMPARs) 对于激发性突触传输和大脑发育至关重要.
- AMPAR子单元中的突变与神经发育障碍 (NDD) 有关,但潜在的机制尚不清楚.
- 在GluA1亚单元中的特定突变 (GRIA1 p.A636T) 与自闭症谱系障碍和智力障碍有关.
研究的目的:
- 研究GRIA1 p.A636T突变对神经元功能和突触发育的功能后果.
- 探索这种突变对海马体学习,记忆和突触可塑性的影响.
- 检查AMPAR功能,线粒体健康和NDD电路发育之间的关系.
主要方法:
- 开发一个GluA1 A636T敲入鼠标模型.
- 在体内电生理学记录以评估神经元活动和突触传播.
- hippocampal 组织的定量蛋白质组分析以确定蛋白质表达变化.
- 线粒体形态和氧化应激评估.
主要成果:
- GluA1 A636T小鼠表现出海马体依赖的学习和记忆受损,CA1神经元活动降低.
- 蛋白质组分析显示,成年突变小鼠的突触蛋白表达变化和线粒体蛋白显著上调.
- 突变小鼠表现出改变的线粒体形态,增加了氧化应激,减少了基底刺激性传播和持续的静音突触.
结论:
- GRIA1 p.A636T突变破坏了海马体内突触和代谢程序的协调发展.
- 由于这种突变而导致刺激信号的改变导致了延迟的线粒体应激和持续的电路功能障碍.
- 突触-线粒体合是理解谷氨酸受体离子转移性 (GRI) 障碍和NDDs的关键因素.
相关概念视频
02:47The Synapse
133.7K
Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
133.7K
01:28Electrical Synapses
10.9K
Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
10.9K
01:26Chemical Synapses
11.8K
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
11.8K
01:26Chemical Synapses
4.6K
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
4.6K
01:25Overview of Synapses
5.5K
A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
5.5K
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
4.1K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
4.1K