Related Experiment Video
Updated: May 14, 2026
09:21
Viral-mediated Labeling and Transplantation of Medial Ganglionic Eminence (MGE) Cells for In Vivo Studies
Published on: April 23, 2015
GABAergic neurons regulate lateral ventricular development via transcription factor Pax5
Nobuhisa Ohtsuka1, Sylvia Badurek, Meinrad Busslinger
1Program in Structural and Molecular Neuroscience, McLean Hospital, Belmont, MA, USA.
Genesis (New York, N.Y. : 2000)
|January 26, 2013
Summary
Pax5 in GABAergic neurons is crucial for normal brain development. Deleting Pax5 in these neurons caused lethal hydrocephalus in mice, indicating its essential role in ventricular development.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Postmortem studies show reduced Pax5 transcription factor in GABAergic neurons of bipolar disorder patients.
- Bipolar disorder is a neurodevelopmental disorder, prompting investigation into Pax5's role in normal brain development.
Purpose of the Study:
- To investigate the function of the transcription factor Pax5 within GABAergic neurons during brain development.
- To determine if Pax5 in GABAergic neurons is essential for normal ventricular development.
Main Methods:
- Utilized a novel Gad1-Cre transgenic mouse line to specifically delete Pax5 in GABAergic neurons (Pax5 floxed mice).
- Observed and characterized phenotypes in mice with conditional knockout of Pax5 in GABAergic neurons.
- Conducted quantitative trait loci (QTL) mapping to link genetic loci to ventricular size differences.
Main Results:
- Conditional knockout of Pax5 in GABAergic neurons resulted in marked enlargement of lateral ventricles, leading to hydrocephalus.
- The hydrocephalus phenotype was observed in both homozygous and heterozygous Pax5 conditional knockout mice, showing gene dosage-dependent penetrance.
- Findings align with previous QTL mapping linking a segment on mouse chromosome 4, containing Pax5, to ventricular size variations.
Conclusions:
- Pax5 in GABAergic neurons is essential for normal development and maintenance of ventricular structures.
- The study demonstrates a critical role for Pax5 in regulating brain development, specifically ventricular size.
- Pax5 is identified as a key gene underlying QTL-associated differences in lateral ventricular size.
Related Concept Videos
02:23Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
01:30General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...