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Subtype-selective Electroporation of Cortical Interneurons
Published on: August 18, 2014
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Neuronal activity is required for the development of specific cortical interneuron subtypes
Natalia V De Marco García1, Theofanis Karayannis, Gord Fishell
1Smilow Neuroscience Program, Departments of Cell Biology and Neural Science, New York University Langone Medical Center, New York, New York 10016, USA.
Nature
|April 5, 2011
Summary
Electrical activity guides the migration and development of specific cortical interneurons originating from the caudal ganglionic eminence (CGE). This activity is crucial for the correct formation of reelin-positive and calretinin-positive interneuron circuits.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Electrical activity regulates cortical development, particularly in pyramidal cells.
- The role of activity in the development of GABA-producing interneurons, a heterogeneous neuronal population, remains largely unknown.
- Cortical interneurons originate from various sources, including the caudal ganglionic eminence (CGE).
Purpose of the Study:
- To investigate the role of electrical activity in the development of CGE-derived cortical interneurons.
- To determine the critical periods and mechanisms by which activity influences interneuron migration and differentiation.
- To identify genes involved in activity-dependent interneuron development.
Main Methods:
- In vivo studies in mice.
- Analysis of interneuron migration and morphology.
- Genetic manipulation and gene expression analysis (e.g., Elmo1, Dlx1).
- Electrophysiological recordings and activity manipulation.
Main Results:
- Electrical activity is essential for the correct migration of reelin (Re)-positive and calretinin (Cr)-positive interneurons before postnatal day 3.
- Glutamate-mediated activity after postnatal day 3 influences the axonal and dendritic development of these interneurons.
- The engulfment and cell motility 1 (Elmo1) gene, regulated by distal-less homeobox 1 (Dlx1), is selectively expressed in Re(+) and Cr(+) interneurons and is critical for their activity-dependent migration.
Conclusions:
- Electrical activity plays a selective and crucial role in the development and cortical integration of specific interneuron subtypes (Re+ and Cr+).
- Elmo1 mediates activity-dependent migration of these interneurons, highlighting a novel mechanism for regulating neuronal circuit formation.
- These findings advance our understanding of how neuronal diversity and circuit assembly are controlled by activity during cortical development.
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