突触胺7的替代拼接调节了寡合化和短期突触可塑性
Nikunj Mehta1,2,3, Devin T Larson1,3, Raghava Jagadeesh Salaka1,3
1Department of Neuroscience, University of Wisconsin-Madison, Madison, WI, United States.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
突触胺7 (syt7) 的替代拼接产生了微调短期可塑性 (STP) 的变体. 不同的syt7异型不同调节突触囊泡动力学,影响学习和记忆.
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
- 细胞生物学 细胞生物学
背景情况:
- 突触可塑性对于学习和记忆至关重要.
- 预突触传感器synaptotagmin 7 (syt7) 影响短期可塑性 (STP),但其确切作用尚未完全理解.
研究的目的:
- 调查syt7柔膜链接器的替代拼接如何影响其调节突触可塑性的功能.
- 阐明不同syt7异型调节突触囊泡动态的分子机制.
主要方法:
- 使用替代拼接分析来识别syt7变体.
- 采用液-液相分离试验和MINFLUX超分辨率显微镜来研究syt7的寡合化和局部化.
- 使用iGluSnFR成像来评估syt7异型体对STP的功能影响.
主要成果:
- 替代拼接产生不同的syt7异构 (α,β,γ) 具有不同的寡合化特性:α和β形成凝聚物,而γ形成聚合物.
- 这些syt7异型表现出不同的能力来调节配对脉冲促进和突触抑郁,当表达在同等水平时.
- syt7定位在活跃区域内的集群中,这表明它在控制突触囊泡动力学方面发挥了直接作用.
结论:
- 替代拼接的syt7柔膜链接器作为一个分子开关,多样化其功能在突触可塑性.
- syt7异构体的微分寡合化和局部化允许微调短期可塑性.
- 这些发现提供了对学习和记忆背后的分子机制的新见解.
相关概念视频
Alternative RNA Splicing
24.6K
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
24.6K
Alternative RNA Splicing
4.8K
4.8K
RNA Splicing
60.3K
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
60.3K
Chromatin Structure Regulates pre-mRNA Processing
8.1K
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
8.1K
Chemical Synapses
11.1K
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...
11.1K
Chemical Synapses
4.2K
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...
4.2K


