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Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...
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Beyond boundaries: extended temporal flexibility in synaptic tagging and capture.

Yee Song Chong1,2, Sheila Ruixia Ang1,2, Sreedharan Sajikumar3,4,5

  • 1Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.

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Synaptic tagging and capture (STC) allows synapses to form memories. This study found that synaptic tags can capture plasticity-related products (PRPs) even after 9 hours, expanding the known time window for memory formation.

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Area of Science:

  • Neuroscience
  • Molecular Biology

Background:

  • Synaptic plasticity underlies learning and memory.
  • Synaptic tagging and capture (STC) explains how activated synapses are marked to receive plasticity-related products (PRPs).
  • The temporal window for STC has been considered relatively short, especially in vivo.

Purpose of the Study:

  • To investigate the temporal flexibility of tag-PRP interactions in synaptic tagging and capture (STC).
  • To determine the maximum time interval between synaptic activation events for successful STC.

Main Methods:

  • Utilized a strong-before-weak synaptic plasticity paradigm.
  • Applied varying time intervals between early-LTP (protein synthesis-independent) and late-LTP (protein synthesis-dependent) induction.
  • Assessed the success of STC based on plasticity stabilization.

Main Results:

  • Successful STC was observed with a significant time interval of up to 9 hours between the strong and weak stimuli.
  • This indicates a much broader temporal window for tag-PRP interactions than previously demonstrated.
  • The findings challenge existing models of STC temporal constraints.

Conclusions:

  • The temporal window for synaptic tagging and capture is more flexible than previously thought.
  • This extended window provides new insights into mechanisms of associative memory formation.
  • Weaker memories may be strengthened by preceding stronger memory events over extended periods.