Definitions for synapsin
synapsin

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1. synapsinnoun

   Any of a family of proteins implicated in the regulation of neurotransmitter release at synapses.

WikipediaRate this definition:0.0 / 0 votes

1. Synapsin

   The synapsins are a family of proteins that have long been implicated in the regulation of neurotransmitter release at synapses. Specifically, they are thought to be involved in regulating the number of synaptic vesicles available for release via exocytosis at any one time. Synapsins are present in invertebrates and vertebrates and are strongly conserved across all species. They are expressed in highest concentration in the nervous system, although they also express in other body systems such as the reproductive organs, including both eggs and spermatozoa. Synapsin function also increases as the organism matures, reaching its peak at sexual maturity.Current studies suggest the following hypothesis for the role of synapsin: synapsins bind synaptic vesicles to components of the cytoskeleton which prevents them from migrating to the presynaptic membrane and releasing neurotransmitter. During an action potential, synapsins are phosphorylated by PKA (cAMP dependent protein kinase), releasing the synaptic vesicles and allowing them to move to the membrane and release their neurotransmitter. Gene knockout studies in mice (where the mouse is unable to produce synapsin) have had some surprising results. Consistently, knockout studies have shown that mice lacking one or more synapsins have defects in synaptic transmission induced by high‐frequency stimulation, suggesting that the synapsins may be one of the factors boosting release probability in synapses at high firing rates, such as by aiding the recruitment of vesicles from the reserve pool. Furthermore, mice lacking all three synapsins are prone to seizures, and experience learning defects. These results suggest that while synapsins are not essential for synaptic function, they do serve an important modulatory role. Lastly, observed effects seemed to vary between inhibitory and excitatory synapses, suggesting synapsins may play a slightly different role in each type.

WikidataRate this definition:0.0 / 0 votes

1. Synapsin

   The synapsins are a family of proteins that have long been implicated in the regulation of neurotransmitter release at synapses. Specifically, they are thought to be involved in regulating the number of synaptic vesicles available for release via exocytosis at any one time.Synapsins are present in invertebrates and vertebrates and are somewhat homologous across evaluated vertebrates. Current studies suggest the following hypothesis for the role of synapsin: synapsins bind synaptic vesicles to components of the cytoskeleton which prevents them from migrating to the presynaptic membrane and releasing transmitter. During an action potential, synapsins are phosphorylated by PKA, releasing the synaptic vesicles and allowing them to move to the membrane and release their neurotransmitter. Gene knockout studies in mice have had some surprising results. Mice lacking all three synapsins are prone to seizures, and experience learning defects. These results suggest that while synapsins are not essential for synaptic function, they do serve an important modulatory role. Conversely, studies using transgenic mice in which neuronal signaling is abolished in specific circuitries showed that synaptic activity regulates, but is not essential to maintain, the expression of these proteins.

How to pronounce synapsin?

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Numerology

1. Chaldean Numerology

   The numerical value of synapsin in Chaldean Numerology is: 9

2. Pythagorean Numerology

   The numerical value of synapsin in Pythagorean Numerology is: 9

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References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Synapsin
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Synapsin
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=synapsin