Distinct neuronal coding schemes in memory revealed by selective erasure of fast synchronous synaptic transmission.

Distinct neuronal coding schemes in memory revealed by selective erasure of fast synchronous synaptic transmission.
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DOI:
10.1016/j.neuron.2011.12.036
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发表时间:
2012-03-08
期刊:
影响因子:
16.2
通讯作者:
Südhof TC
Südhof TC
中科院分区:
医学1区
文献类型:
--
作者:
Xu W;Morishita W;Buckmaster PS;Pang ZP;Malenka RC;Südhof TC

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Neurons encode information by firing spikes in isolation or bursts, and propagate information by spike-triggered neurotransmitter release that initiates synaptic transmission. Isolated spikes trigger neurotransmitter release unreliably but with high temporal precision, whereas bursts of spikes boost transmission fidelity by overcoming the unreliability of spike-triggered release but are temporally imprecise. However, the relative physiological importance of different spike firing modes remains unclear. Here, we show that knockdown of synaptotagmin-1, the major Ca2+-sensor for neurotransmitter release, abrogated neurotransmission evoked by isolated spikes, but only delayed without abolishing neurotransmission evoked by bursts of spikes. Nevertheless, knockdown of synaptotagmin-1 in the hippocampal CA1 region did not impede acquisition of recent contextual fear memories, although it did impair the precision of such memories. In contrast, knockdown of synaptotagmin-1 in the prefrontal cortex impaired all remote fear memories. These results indicate that different brain circuits and types of memory employ distinct spike-coding schemes to encode and transmit information.
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