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Subtype-selective Electroporation of Cortical Interneurons
Published on: August 18, 2014
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Postmitotic Prox1 Expression Controls the Final Specification of Cortical VIP Interneuron Subtypes
Tevye Jason Stachniak1,2, Rahel Kastli1,2, Olivia Hanley1,2
1Laboratory of Neural Circuit Assembly, Brain Research Institute, University of Zurich, CH-8057, Zurich, Switzerland.
Summary
The transcription factor Prox1 diversifies cortical VIP interneuron subtypes postnatally. This study reveals Prox1 regulates Elfn1, impacting excitatory inputs and refining inhibitory circuits in the brain.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Neuronal identity is established by transcription factors during development.
- Prox1 is a key transcription factor regulating VIP-positive cortical interneuron development.
Purpose of the Study:
- To investigate the role of Prox1 in specifying VIP interneuron subtypes postnatally.
- To identify downstream targets of Prox1 in VIP interneuron differentiation.
Main Methods:
- In vitro electrophysiology in mice.
- RNA sequencing.
- Genetic and pharmacological manipulations.
- Overexpression studies.
Main Results:
- Postnatal Prox1 removal differentially affects excitatory inputs onto VIP bipolar and multipolar subtypes.
- Elfn1 is a downstream target of Prox1, regulating presynaptic release probability.
- Prox1 deficiency reduces Elfn1 function in VIP multipolar cells but not bipolar cells.
- Elfn1 levels are differentially controlled at the post-transcriptional level.
Conclusions:
- Prox1 drives functional diversification of cortical VIP interneuron subtypes.
- Genetic programs regulated by Prox1 refine VIP interneuron subtypes, expanding the cortex's inhibitory repertoire.
