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Synapsin utilization differs among functional classes of synapses on thalamocortical cells.
Anders Kielland1, Alev Erisir, S Ivar Walaas
1Institute of Basic Medical Sciences, University of Oslo, N-0317 Oslo, Norway.
Summary
Synapsins are not essential for high-frequency synaptic transmission in the mouse retina. Gene knockout of synapsins did not affect retinogeniculate synapses, indicating their absence in these terminals.
Area of Science:
- Neuroscience
- Cell Biology
- Synaptic Plasticity
Background:
- Synapsins are synaptic vesicle-associated proteins crucial for sustained synaptic transmission.
- Their role in different synapse types with varying transmission rates is not fully understood.
Purpose of the Study:
- To investigate the role of synapsins I and II in short-term synaptic plasticity.
- To compare synapsin function in high-frequency retinogeniculate and low-frequency corticogeniculate synapses.
Main Methods:
- Electrophysiological recordings in mouse dorsal lateral geniculate nucleus.
- Gene knockout of synapsin I and II.
- Immunostaining and electron microscopy for synaptic terminal morphology.
Main Results:
- Synapsin gene inactivation altered plasticity in corticogeniculate synapses but not retinogeniculate synapses.
- Synapsins I and II were absent in retinogeniculate terminals but present in corticogeniculate and GABAergic terminals.
- Knockout mice showed reduced vesicle density and increased inter-vesicle distance in corticogeniculate terminals.
Conclusions:
- Synapsins I and II are not present in retinogeniculate terminals and are not essential for high-frequency transmission.
- Synapsins play a role in modulating synaptic plasticity in corticogeniculate pathways.