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Polarity Acquisition in Cortical Neurons Is Driven by Synergistic Action of Sox9-Regulated Wwp1 and Wwp2 E3 Ubiquitin Ligases and Intronic miR-140.

Neuron | 2018

The establishment of axon-dendrite polarity is fundamental for radial migration of neurons during cortex development of mammals. We demonstrate that the E3 ubiquitin ligases WW-Containing Proteins 1 and 2 (Wwp1 and Wwp2) are indispensable for proper polarization of developing neurons. We show that knockout of Wwp1 and Wwp2 results in defects in axon-dendrite polarity in pyramidal neurons, and their aberrant laminar cortical distribution. Knockout of miR-140, encoded in Wwp2 intron, engenders phenotypic changes analogous to those upon Wwp1 and Wwp2 deletion. Intriguingly, transcription of the Wwp1 and Wwp2/miR-140 loci in neurons is induced by the transcription factor Sox9. Finally, we provide evidence that miR-140 supervises the establishment of axon-dendrite polarity through repression of Fyn kinase mRNA. Our data delineate a novel regulatory pathway that involves Sox9-[Wwp1/Wwp2/miR-140]-Fyn required for axon specification, acquisition of pyramidal morphology, and proper laminar distribution of cortical neurons.

Pubmed ID: 30392800 RIS Download

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anti-tdTomato (antibody)

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Goat Anti-Rabbit IgG (H + L)-HRP Conjugate (antibody)

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Adobe Photoshop (software resource)

RRID:SCR_014199

Software for image processing, analysis, and editing. The software includes features such as touch capabilities, a customizable toolbar, 2D and 3D image merging, and Cloud access and options.

View all literature mentions

GraphPad Prism (software resource)

RRID:SCR_002798

Statistical analysis software that combines scientific graphing, comprehensive curve fitting (nonlinear regression), understandable statistics, and data organization. Designed for biological research applications in pharmacology, physiology, and other biological fields for data analysis, hypothesis testing, and modeling.

View all literature mentions

Fiji (software resource)

RRID:SCR_002285

Software package as distribution of ImageJ and ImageJ2 together with Java, Java3D and plugins organized into coherent menu structure. Used to assist research in life sciences.

View all literature mentions

DRAQ5 (antibody)

RRID:AB_2314341

This unknown targets

View all literature mentions

Brn-2 (C-20) (antibody)

RRID:AB_2167385

This polyclonal targets POU3F2

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Anti-NeuN (antibody)

RRID:AB_2298772

This monoclonal targets NeuN

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Neuro-2a (cell line)

RRID:CVCL_0470

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BomTac:NMRI (organism)

RRID:IMSR_TAC:nmri

Mus musculus with name BomTac:NMRI from IMSR.

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HEK293T (cell line)

RRID:CVCL_0063

Cell line HEK293T is a Transformed cell line with a species of origin Homo sapiens (Human)

View all literature mentions

HEK293-FT (cell line)

RRID:CVCL_6911

Cell line HEK293-FT is a Transformed cell line with a species of origin Homo sapiens (Human)

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Goat Anti-Rabbit IgG (H + L)-HRP Conjugate (antibody)

RRID:AB_11125142

This polyclonal secondary targets IgG (H+L)

View all literature mentions

Goat Anti-Mouse IgG (H L)-HRP Conjugate (antibody)

RRID:AB_11125936

This unknown targets Goat Mouse IgG (H L)-HRP Conjugate

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Anti-Cre-Recombinase (antibody)

RRID:AB_2619968

This polyclonal targets Cre-Recombinase

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Anti-Sox9 (antibody)

RRID:AB_2239761

This polyclonal targets Sox9

View all literature mentions

Fyn (15) (antibody)

RRID:AB_627642

This monoclonal targets Fyn (15)

View all literature mentions

CDP (M-222) (antibody)

RRID:AB_2261231

This polyclonal targets CUX1

View all literature mentions

Monoclonal Anti-Actin antibody produced in mouse (antibody)

RRID:AB_262137

This monoclonal targets Actin antibody produced in mouse

View all literature mentions

Myc-Tag (9B11) Mouse mAb (antibody)

RRID:AB_331783

This monoclonal targets c-Myc

View all literature mentions

Caspase-3 Antibody (antibody)

RRID:AB_331439

This polyclonal targets Caspase-3

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TBR1 antibody (antibody)

RRID:AB_2200219

This polyclonal targets Tbr1

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Histone H3 (phospho S10) antibody - Mitosis Marker (antibody)

RRID:AB_304763

This polyclonal targets Histone H3 (phospho S10) antibody - Mitosis Marker

View all literature mentions

anti-tdTomato (antibody)

RRID:AB_2722750

This polyclonal targets tdTomato

View all literature mentions

Anti-GFP antibody (antibody)

RRID:AB_300798

This polyclonal targets GFP

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