GO:0030048 actin filament-based movement: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0030048 actin filament-based movement is defined as the movement of organelles or other particles along actin filaments, or the sliding of actin filaments past each other, mediated by motor proteins.
• Myosin motor proteins convert chemical energy from ATP into mechanical force to drive actin filament-based movement.
• Calcium-dependent regulatory switches control actomyosin contractile systems, linking actin filament-based movement to dynamic cellular responses.
• Rho GTPase signaling complexes are master regulators of actin cytoskeletal dynamics during cell migration and invasion.
• Actin-dependent organelle movement, such as plastid movement, can generate motive force for nuclear positioning in plant cells.
• Dysregulation of actin filament-based movement contributes to cancer invasion, metastasis, and other human pathologies.
Description
Actin filament-based movement (GO:0030048) is a fundamental biological process in which motor proteins drive the translocation of organelles, particles, or actin filaments themselves along actin tracks. This process underlies a wide range of cellular behaviors, from intracellular transport and organelle positioning to cell migration and cytokinesis. The core machinery involves myosin motors that hydrolyze ATP to generate force and movement along actin filaments. Calcium-dependent regulatory switches further modulate actomyosin contractile systems, allowing rapid responses to cellular signals. In recent years, actin filament-based movement has emerged as a critical area of research because of its roles in development, tissue homeostasis, and disease. For example, Rho GTPase signaling complexes spatiotemporally control actin dynamics during cell migration and invasion, processes that are hijacked in cancer metastasis. Additionally, actin-dependent plastid movement is required for motive force generation in directional nuclear movement in plants, illustrating the broad evolutionary conservation of this process. Understanding the molecular players and regulatory mechanisms of actin filament-based movement is therefore essential for researchers in cell biology, developmental biology, and oncology.
actin filament-based movement At A Glance
| GO ID | GO:0030048 |
|---|---|
| GO term | actin filament-based movement |
| Ontology | biological_process |
| Synonym | none |
| Definition | Movement of organelles or other particles along actin filaments, or sliding of actin filaments past each other, mediated by motor proteins. |
| Major function | Intracellular transport, organelle positioning, cell motility, and contractility |
| Motor proteins | Myosins (e.g., myosin II, myosin V, myosin VI) |
| Key regulators | Rho GTPases, calcium signaling |
| Related processes | Cell migration, cytokinesis, vesicle transport |
What Is GO:0030048?
According to the Gene Ontology, actin filament-based movement (GO:0030048) is the movement of organelles or other particles along actin filaments, or the sliding of actin filaments past each other, mediated by motor proteins. This definition encompasses both the transport of cargo along actin tracks and the relative sliding of actin filaments that produces contractile forces. The process is driven by myosin motor proteins, which use ATP hydrolysis to move along actin filaments. It is distinct from microtubule-based movement, although both are cytoskeleton-dependent transport mechanisms.
Why Is actin filament-based movement Important in Cell Biology?
Actin filament-based movement is essential for numerous cellular and developmental processes, including cell migration, organelle inheritance, and tissue morphogenesis. Its dysregulation is implicated in cancer progression, where Rho GTPase signaling complexes drive invasive migration. Moreover, calcium-dependent regulation of actomyosin contractility is critical for muscle contraction and non-muscle cell contractility. Studying this process provides insights into fundamental cell biology and identifies potential therapeutic targets for diseases ranging from cancer to developmental disorders.
• Drives intracellular transport of organelles and vesicles, maintaining cell polarity and function.
• Enables cell migration and invasion, key steps in cancer metastasis.
• Regulates cytokinesis and cell shape changes during development.
• Underlies muscle contraction through actomyosin sliding.
• Facilitates nuclear positioning and movement in plant and animal cells.
• Involved in cargo recognition and transport by unconventional myosins.
• Modulated by calcium signaling for rapid contractile responses.
• Controlled by Rho GTPase signaling complexes in migration and invasion.
• Contributes to force generation in myocardial contraction.
• Potential target for therapeutic intervention in metastasis and muscle disorders.
What Happens During actin filament-based movement?
Initiation and Motor Recruitment
In simple terms: The process starts when motor proteins are recruited to actin filaments to begin movement.
Actin filament-based movement is initiated by the recruitment of myosin motor proteins to actin filaments. Myosins bind to actin through their head domains, and cargo adaptors or regulatory proteins link specific cargoes to the motor tails. Rho GTPase signaling complexes can activate nucleation and assembly of actin filaments, creating tracks for movement.
Force Generation and Translocation
In simple terms: Myosin motors use ATP to walk along actin filaments, carrying cargo or sliding filaments.
Upon ATP binding, myosin heads detach from actin; ATP hydrolysis and subsequent product release drive a conformational change that moves the myosin head toward the actin filament, generating force. This cycle repeats, allowing processive movement along actin filaments. In muscle and non-muscle cells, sliding of actin filaments past each other produces contraction.
Cargo Transport and Organelle Positioning
In simple terms: Motors carry organelles and other cargo to specific locations within the cell.
Unconventional myosins, such as myosin V and myosin VI, transport organelles, vesicles, and RNA-protein complexes along actin filaments. This transport is critical for organelle positioning, including nuclear movement in plant cells where actin-dependent plastid movement generates motive force.
Regulation by Calcium and Signaling
In simple terms: Calcium and signaling pathways control when and where movement occurs.
Calcium-dependent protein switches regulate actomyosin contractile systems, enabling rapid responses to cellular signals. Rho GTPase signaling complexes spatiotemporally coordinate actin dynamics during cell migration and invasion. Additionally, MgADP modulates myosin head movement and force production in myocardial contraction.
Key Genes Involved in GO:0030048 actin filament-based movement
The following genes and proteins are central to actin filament-based movement, encompassing myosin motors, actin regulators, and signaling components.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MYH9 | Non-muscle myosin II heavy chain | Cell motility, cytokinesis, and cancer invasion |
| MYH10 | Non-muscle myosin IIB | Neuronal development and cell migration |
| MYO5A | Myosin Va, unconventional myosin | Organelle transport and cargo recognition |
| MYO6 | Myosin VI, unconventional myosin | Endocytosis and vesicle trafficking |
| ACTB | Beta-actin, cytoskeletal component | Cell shape, motility, and intracellular transport |
| ACTG1 | Gamma-actin | Cytoskeletal dynamics in non-muscle cells |
| RHOA | Rho GTPase | Regulates actin cytoskeleton and cell migration |
| RAC1 | Rho GTPase | Lamellipodia formation and cell invasion |
| CDC42 | Rho GTPase | Filopodia formation and cell polarity |
| ROCK1 | Rho-associated kinase | Actomyosin contractility and migration |
| ROCK2 | Rho-associated kinase | Stress fiber formation and invasion |
| MYL9 | Myosin light chain | Regulates myosin II activity in contractility |
| MYL12A | Myosin light chain | Non-muscle myosin regulation |
| CALM1 | Calmodulin | Calcium-dependent regulation of myosin |
| TNNT2 | Cardiac troponin T | Actomyosin regulation in myocardium |
| TPM1 | Tropomyosin | Actin filament stabilization and regulation |
| PFN1 | Profilin-1 | Actin polymerization and filament dynamics |
How Is actin filament-based movement Regulated?
Actin filament-based movement is regulated by multiple signaling pathways. Rho GTPase signaling complexes, including RhoA, Rac1, and Cdc42, control actin polymerization and actomyosin contractility during cell migration and invasion. Calcium-dependent protein switches regulate actomyosin contractile systems by modulating myosin light chain phosphorylation and troponin-tropomyosin complexes. Additionally, MgADP levels influence myosin head movement and force production in myocardial contraction. These regulatory mechanisms ensure precise spatial and temporal control of actin filament-based movement.
actin filament-based movement and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| RHOA | Cancer invasion and metastasis | Knockout in cancer cell lines |
| MYH9 | MYH9-related disorders, platelet dysfunction | Point mutation knock-in in iPSCs |
| MYO5A | Griscelli syndrome, neurological defects | Knockout in melanocytes |
| TNNT2 | Cardiomyopathy | Knock-in of patient mutations in cardiomyocytes |
| ACTB | Baraitser-Winter syndrome | Overexpression and knockout in fibroblasts |
Cancer Invasion and Metastasis
Dysregulated actin filament-based movement is a hallmark of cancer invasion and metastasis. Rho GTPase signaling complexes drive the formation of invadopodia and lamellipodia, enabling cancer cells to migrate and invade surrounding tissues. Overexpression of myosin motors and actin regulators correlates with poor prognosis in various cancers.
Cardiovascular and Muscle Disorders
Mutations in genes encoding sarcomeric proteins, such as TNNT2 and TPM1, disrupt actomyosin sliding and lead to cardiomyopathies. Impaired calcium-dependent regulation of actomyosin contractility contributes to heart failure and muscle weakness.
Developmental and Neurological Disorders
Defects in actin-based transport by unconventional myosins cause neurological disorders, including hearing loss and pigmentation defects. Disrupted nuclear movement and organelle positioning during development can lead to developmental abnormalities.
From actin filament-based movement-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of MYH9 affect cell migration? | MYH9 knockout in HeLa or MDA-MB-231 cells |
| How does RHOA mutation affect invasion? | Point mutation knock-in of constitutively active RHOA |
| Can MYO5A cargo binding be tracked? | Tagged knock-in of MYO5A with fluorescent protein |
| Does TNNT2 mutation impair contractility? | Knock-in of TNNT2 mutation in iPSC-derived cardiomyocytes |
| What is the role of RAC1 in lamellipodia? | Overexpression of constitutively active RAC1 |
| Is ACTB required for organelle transport? | CRISPR knockout of ACTB in fibroblasts |
How to Study the actin filament-based movement Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live-cell imaging | Real-time movement of organelles and actin | Tracking myosin-driven transport |
| CRISPR knockout screening | Genes required for movement | Identifying novel regulators of migration |
| Proteomics | Protein interactions and cargo composition | Mapping myosin cargo adaptors |
| In vitro motility assay | Motor protein velocity and force | Quantifying myosin activity |
| ATPase assay | ATP hydrolysis rate | Measuring motor enzymatic activity |
| RNA-seq | Transcriptional changes | Assessing gene expression in migration |
| Immunofluorescence | Localization of actin and myosin | Visualizing cytoskeletal structures |
Live-Cell Imaging
Live-cell fluorescence microscopy allows real-time visualization of actin filament-based movement, including organelle transport and actin sliding. Tagged myosin motors and actin-binding proteins enable tracking of dynamic movements.
Proteomics and Interactomics
Mass spectrometry-based proteomics identifies cargo proteins and interactors of myosin motors, revealing the molecular composition of transport complexes.
CRISPR Screening
Genome-wide CRISPR knockout screens can identify genes required for actin filament-based movement, such as regulators of cell migration and invasion.
Biochemical Assays
In vitro motility assays and ATPase activity measurements quantify motor protein function and force generation.
How CRISPR Can Be Used to Study GO:0030048 actin filament-based movement
Knockout
CRISPR knockout of genes such as MYH9, RHOA, or RAC1 can abolish actin filament-based movement, revealing their essential roles in cell migration and organelle transport.
Point Mutation
Introducing point mutations in motor domains of myosins or in regulatory proteins like TNNT2 allows precise dissection of their function in actin filament-based movement.
Knock-in
Knock-in of fluorescent tags or disease-associated mutations into endogenous loci enables tracking of protein dynamics and modeling of human disorders.
Overexpression
Overexpression of constitutively active Rho GTPases or myosin motors can enhance actin filament-based movement, facilitating studies of gain-of-function effects.
How EDITGENE Supports actin filament-based movement Research
Researchers studying actin filament-based movement-related genes often need to determine whether a candidate gene is causally involved in the process or is merely correlated. EDITGENE provides comprehensive CRISPR-based services to enable precise genetic manipulation and functional validation.
Contact EDITGENE today to design your custom CRISPR model for actin filament-based movement research.
Frequently Asked Questions About actin filament-based movement
What is actin filament-based movement?
Actin filament-based movement (GO:0030048) is the movement of organelles or other particles along actin filaments, or the sliding of actin filaments past each other, mediated by motor proteins.
What genes are involved in actin filament-based movement?
Key genes include myosin motors (MYH9, MYO5A, MYO6), actin isoforms (ACTB, ACTG1), and Rho GTPases (RHOA, RAC1, CDC42).
How is actin filament-based movement regulated?
It is regulated by calcium signaling, Rho GTPase pathways, and phosphorylation of myosin light chains.
What diseases are associated with defects in actin filament-based movement?
Defects are linked to cancer metastasis, cardiomyopathies, and neurological disorders such as Griscelli syndrome.
What methods are used to study actin filament-based movement?
Common methods include live-cell imaging, CRISPR screening, proteomics, and in vitro motility assays.
Which myosin motors are involved in actin filament-based movement?
Myosin II, myosin V, and myosin VI are major motors that transport cargo and generate contractile forces.
How do Rho GTPases control actin filament-based movement?
Rho GTPases such as RhoA, Rac1, and Cdc42 regulate actin polymerization and actomyosin contractility during migration and invasion.
Can CRISPR be used to study actin filament-based movement?
Yes, CRISPR knockout, knock-in, and point mutation models enable precise functional studies of genes involved in this process.
What is the role of calcium in actin filament-based movement?
Calcium-dependent protein switches regulate actomyosin contractile systems, controlling contraction and movement.
How does actin filament-based movement contribute to cell migration?
It drives lamellipodia and filopodia formation, enabling cells to move and invade tissues.
Conclusion
Actin filament-based movement (GO:0030048) is a central biological process that governs intracellular transport, cell motility, and contractility. Its molecular machinery, including myosin motors and Rho GTPase regulators, is highly conserved and essential for development and homeostasis. Dysregulation of this process contributes to cancer, cardiovascular, and neurological diseases, making it a compelling target for research and therapeutic intervention. Advances in CRISPR-based models and imaging technologies continue to illuminate the mechanisms and functions of actin filament-based movement, offering new opportunities for discovery.
References
- 1. Higa T et al.. 2014. Actin-dependent plastid movement is required for motive force generation in directional nuclear movement in plants.. Proc Natl Acad Sci U S A 111(11):4327-31 PMID: 24591587
- 2. Lu Q et al.. 2014. Cargo recognition and cargo-mediated regulation of unconventional myosins.. Acc Chem Res 47(10):3061-70 PMID: 25230296
- 3. Marston S. 1995. Ca(2+)-dependent protein switches in actomyosin based contractile systems.. Int J Biochem Cell Biol 27(2):97-108 PMID: 7767791
- 4. Lawson CD et al.. 2018. Rho GTPase signaling complexes in cell migration and invasion.. J Cell Biol 217(2):447-457 PMID: 29233866
- 5. Awinda PO et al.. 2022. MgADP Promotes Myosin Head Movement toward Actin at Low [Ca(2+)] to Increase Force Production and Ca(2+)-Sensitivity of Contraction in Permeabilized Porcine Myocardial Strips.. Int J Mol Sci 23(23) PMID: 36499408
- 6. Krendel M et al.. 2005. Myosins: tails (and heads) of functional diversity.. Physiology (Bethesda) 20:239-51 PMID: 16024512
- 7. Guan X et al.. 2020. Rho GTPases and related signaling complexes in cell migration and invasion.. Exp Cell Res 388(1):111824 PMID: 31926148
- 8. Sanguansin S et al.. 2024. Exploring protein profiles and hub genes in ameloblastoma.. Biomed Rep 20(4):64 PMID: 38476605
