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Experience-Dependent Development of Dendritic Arbors in Mouse Visual Cortex.

Sarah E V Richards1,2, Anna R Moore1,2, Alice Y Nam1,2

  • 1Department of Biology.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 17, 2020
PubMed
Summary
This summary is machine-generated.

Pyramidal neuron dendritic arbors grow significantly after eye opening, primarily by lengthening segments. Visual experience has a modest impact, while Rem2 gene regulates arbor growth and structure.

Keywords:
Rem2cell-autonomousdendritesmorphologypyramidal neuron

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Computational Neuroscience

Background:

  • Dendritic arbors are crucial for neuronal connectivity and signal integration.
  • Understanding cortical neuron development and experience-dependent plasticity is incomplete.
  • The basal arbor of pyramidal neurons plays a key role in visual cortex function.

Purpose of the Study:

  • To quantitatively analyze basal dendritic arbor development in mouse visual cortex during early postnatal stages.
  • To investigate the influence of visual experience on dendritic arbor growth.
  • To elucidate the molecular mechanisms, specifically the role of Rem2, in arbor development.

Main Methods:

  • Large-scale 3D reconstruction of 849 pyramidal neuron basal arbors.
  • Comparative analysis of typically reared and dark-reared mice.
  • Genetic manipulation (KO animals) to study the function of Rem2.

Main Results:

  • Basal arbors showed substantial growth (45% length increase) between P7 and P30, mainly via segment extension.
  • Primary neurite and segment number were established by P7.
  • Visual experience accounted for only a 15% net gain in arbor length.
  • Rem2 acts as an experience-dependent regulator, promoting dendritic length and inhibiting segment addition.

Conclusions:

  • Dendritic arbor development is largely experience-independent in early postnatal stages.
  • Visual experience has a limited but significant role in shaping dendritic arbors.
  • Rem2 is a key molecular player in regulating dendritic arbor architecture and plasticity.