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Doc2 is a Ca2+ sensor required for asynchronous neurotransmitter release.

Jun Yao1, Jon D Gaffaney, Sung E Kwon

  • 1Howard Hughes Medical Institute and Department of Neuroscience, University of Wisconsin, Madison, WI 53706, USA.

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|November 1, 2011
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Summary
This summary is machine-generated.

Doc2 is identified as a calcium (Ca2+) sensor crucial for regulating asynchronous neurotransmitter release, a slower phase of synaptic transmission. Its expression levels directly impact the speed and occurrence of this release mechanism.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Synaptic transmission comprises fast synchronous and slow asynchronous phases.
  • Distinct calcium (Ca2+) sensors regulate these release phases.
  • Synaptotagmin I is the known sensor for rapid release, but the asynchronous sensor is unidentified.

Purpose of the Study:

  • To identify the Ca2+ sensor responsible for asynchronous neurotransmitter release.
  • To characterize the kinetic properties of potential Ca2+ sensors involved in synaptic transmission.

Main Methods:

  • Screening for neuronal Ca2+ sensors with slow kinetics.
  • Assessing the function of Doc2 in neurotransmitter release.
  • Manipulating Doc2 expression levels in hippocampal neurons.

Main Results:

  • Doc2 exhibits kinetics consistent with asynchronous release.
  • Upregulating Doc2 enhances the slow phase of synaptic transmission.
  • Downregulating Doc2 reduces the slow phase of synaptic transmission.
  • Doc2 manipulation affects asynchronous release but not synchronous release from single action potentials.

Conclusions:

  • Doc2 is proposed as the Ca2+ sensor for asynchronous neurotransmitter release.
  • Doc2's kinetics are tuned to regulate the slow phase of synaptic transmission.
  • Doc2 may influence vesicle availability during repetitive stimulation.