Related Experiment Video
Updated: Jun 14, 2026
08:41
Adeno-associated Virus-mediated Transgene Expression in Genetically Defined Neurons of the Spinal Cord
Published on: May 12, 2018
Actin-mediated gene expression in neurons: the MRTF-SRF connection
1Interfaculty Institute for Cell Biology, Department of Molecular Biology, Neuronal Gene Expression Laboratory, Eberhard-Karls-University Tübingen, Auf der Morgenstelle 15, D-72076 Tübingen, Germany. bernd.knoell@uni-tuebingen.de
Biological Chemistry
|April 8, 2010
Summary
Cellular actin dynamics are sensed by the nucleus, influencing gene expression and neuronal motility. This actin signaling pathway involves myocardin-related transcription factor (MRTF) and serum response factor (SRF) in the nervous system.
Area of Science:
- Cell Biology
- Neuroscience
- Molecular Biology
Background:
- Traditionally, cellular actin was viewed as confined to cytoplasmic functions.
- Emerging evidence indicates actin dynamics are sensed by the nucleus, impacting gene expression.
- Cytoplasmic and nuclear actin contribute to a regulatory loop influencing cell motility.
Purpose of the Study:
- To explore the role of actin dynamics in modulating gene expression and neuronal motility.
- To highlight the significance of the actin-MRTF-SRF signaling pathway in the nervous system.
Main Methods:
- Investigated the interplay between cellular actin dynamics and nuclear responses.
- Focused on the mechanism of actin signaling influencing gene expression.
- Examined the function of the myocardin-related transcription factor (MRTF) and serum response factor (SRF) transcription module.
Main Results:
- Actin dynamics are sensed by the nucleus, leading to modulation of gene expression.
- The actin-MRTF-SRF pathway is a key regulator of neuronal motility.
- This signaling entity plays a crucial role in various aspects of neuronal movement within the nervous system.
Conclusions:
- Actin's role extends beyond the cytoplasm to regulate nuclear processes and gene expression.
- The actin-MRTF-SRF signaling pathway is essential for neuronal motility.
- Understanding this pathway provides insights into nervous system development and function.
Related Concept Videos
02:11Reporter Genes
Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
Commonly used reporter...
Commonly used reporter...
01:07MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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...
02:04Co-activators and Co-repressors
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
01:16TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
02:26tRNA Activation
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...