GO:0110024 positive regulation of cardiac muscle myoblast proliferation: Signaling Pathways, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0110024 describes any process that activates or increases the frequency, rate or extent of cardiac muscle myoblast proliferation, a critical step in heart development and regeneration.
• Wnt/beta-catenin signaling promotes expansion of Isl-1-positive cardiac progenitor cells through regulation of FGF signaling, directly linking to positive regulation of cardiac myoblast proliferation.
• MicroRNAs such as miR-1 and miR-133 regulate cardiac myoblast proliferation and differentiation, with CDK9 modulating apoptosis via miR-1 expression.
• Dysregulation of cardiac muscle myoblast proliferation contributes to congenital heart defects and impaired cardiac regeneration after injury.
• Key genes involved include ISL1, FGF10, CTNNB1, CDK9, and MEF2C, which coordinate proliferation and differentiation.
• CRISPR-based knockout, knock-in, and overexpression models enable causal dissection of these regulatory pathways in cardiac myoblasts.
Description
Cardiac muscle myoblast proliferation is a fundamental process during embryonic heart development and in adult cardiac regeneration. The Gene Ontology term GO:0110024, positive regulation of cardiac muscle myoblast proliferation, encompasses any molecular event that activates or increases the frequency, rate or extent of this proliferation. Understanding this process is essential for developmental biologists and regenerative medicine researchers aiming to repair damaged myocardium. The proliferation of cardiac myoblasts is tightly controlled by signaling pathways such as Wnt/beta-catenin, which promotes the expansion of Isl-1-positive cardiac progenitor cells through FGF signaling. Additionally, microRNAs like miR-1 and miR-133 modulate myoblast proliferation and differentiation, with CDK9 influencing apoptosis via miR-1. This article synthesizes current knowledge on the mechanisms, key genes, and research methodologies for studying GO:0110024, providing a resource for researchers investigating cardiac development and disease.
positive regulation of cardiac muscle myoblast proliferation At A Glance
| GO ID | GO:0110024 |
|---|---|
| GO term | positive regulation of cardiac muscle myoblast proliferation |
| Ontology | biological_process |
| Synonym | none |
| Major function | Activation or increase of cardiac muscle myoblast proliferation |
| Related process | Cardiac muscle myoblast proliferation (GO:0003254) |
| Key signaling pathway | Wnt/beta-catenin and FGF signaling |
| Associated microRNAs | miR-1, miR-133 |
| Research relevance | Heart development, regeneration, congenital heart defects |
What Is GO:0110024?
GO:0110024 is defined as any biological process that activates or increases the frequency, rate or extent of cardiac muscle myoblast proliferation. In simpler terms, it covers the signals and molecular events that tell cardiac myoblasts to divide more often or faster, which is crucial for building and repairing heart muscle.
Why Is positive regulation of cardiac muscle myoblast proliferation Important in Cell Biology?
Positive regulation of cardiac muscle myoblast proliferation is vital for heart formation during embryogenesis and for potential regenerative therapies after cardiac injury. Disruption of this process can lead to congenital heart defects and impaired cardiac repair. Understanding the molecular players, such as Wnt/beta-catenin and FGF signaling, provides targets for therapeutic intervention. Moreover, microRNA-mediated regulation of myoblast proliferation highlights additional layers of control that could be manipulated.
• Essential for embryonic heart development and cardiac progenitor expansion.
• Implicated in congenital heart defects when dysregulated.
• Potential target for cardiac regeneration after myocardial infarction.
• Regulated by Wnt/beta-catenin and FGF signaling pathways.
• Modulated by microRNAs such as miR-1 and miR-133.
• Involves key transcription factors like Isl-1 and MEF2C.
• Studied using CRISPR knockout and overexpression models.
• Relevant to stem cell-based therapies for heart disease.
• Cross-talks with cell cycle regulators like CDK9.
• Provides insights into myoblast proliferation in other muscle types.
What Happens During positive regulation of cardiac muscle myoblast proliferation?
Initiation by Wnt/beta-catenin signaling
In simple terms: Wnt signals act like a green light for cardiac myoblasts to start dividing.
Wnt/beta-catenin signaling promotes the expansion of Isl-1-positive cardiac progenitor cells through regulation of FGF signaling, directly increasing cardiac myoblast proliferation. Activation of beta-catenin leads to transcriptional upregulation of FGF ligands, which then act in an autocrine or paracrine manner to stimulate proliferation.
FGF signaling amplification
In simple terms: FGF signals act as a megaphone, amplifying the initial proliferation signal.
FGF signaling downstream of Wnt/beta-catenin further drives cardiac myoblast proliferation by activating MAPK/ERK pathways, leading to increased expression of cyclins and progression through the cell cycle. This amplification ensures robust expansion of the cardiac progenitor pool.
MicroRNA modulation
In simple terms: MicroRNAs act as fine-tuners, adjusting the strength of proliferation signals.
MicroRNAs such as miR-1 and miR-133 regulate cardiac myoblast proliferation and differentiation. CDK9 modulates apoptosis of myoblast cells by modulating miR-1 expression, thereby influencing the balance between proliferation and death. Extracellular vesicles from HL-1 cardiac cells carry microRNAs that can affect recipient cell behavior.
Cell cycle entry and progression
In simple terms: The cell cycle engine is revved up, pushing myoblasts to divide.
Positive regulation ultimately converges on the cell cycle machinery, including cyclins and CDKs, to promote G1/S transition and DNA replication. CDK9, for example, regulates apoptosis and proliferation in myoblasts, partly through microRNA-1. This ensures timely and sufficient myoblast expansion for heart morphogenesis.
Key Genes Involved in GO:0110024 positive regulation of cardiac muscle myoblast proliferation
The following genes and proteins are central to the positive regulation of cardiac muscle myoblast proliferation, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CTNNB1 | Beta-catenin, mediates Wnt signaling to promote proliferation | Key regulator of cardiac progenitor expansion |
| ISL1 | Transcription factor marking cardiac progenitors | Marker and effector of proliferation |
| FGF10 | Fibroblast growth factor, stimulates proliferation | Downstream of Wnt/beta-catenin |
| CDK9 | Cyclin-dependent kinase 9, regulates apoptosis and miR-1 | Modulates myoblast survival and proliferation |
| MEF2C | Transcription factor, promotes differentiation and proliferation | Integrates signals for cardiac development |
| MIR1-1 | MicroRNA-1, regulates proliferation and differentiation | Modulated by CDK9 |
| MIR133A1 | MicroRNA-133a, regulates myoblast proliferation | Potential therapeutic target |
| TPM3 | Tropomyosin 3, affects myoblast proliferation and differentiation | Studied in cattle myoblasts |
| LSD1 | Lysine-specific demethylase 1, regulates satellite cell fate | Relevant to skeletal muscle regeneration |
| PAX7 | Satellite cell marker, involved in proliferation | Studied in anole lizard |
| MYOD1 | Myogenic differentiation factor | Balances proliferation and differentiation |
| MYF5 | Myogenic factor 5, promotes proliferation | Key in satellite cell activation |
| CDKN1A | p21, cell cycle inhibitor | Counteracts proliferation |
| CCND1 | Cyclin D1, promotes G1/S transition | Downstream of FGF signaling |
| FGFR1 | FGF receptor 1, transduces proliferation signals | Mediates FGF effects |
| WNT3A | Wnt ligand, activates beta-catenin | Stimulates cardiac progenitor proliferation |
How Is positive regulation of cardiac muscle myoblast proliferation Regulated?
The positive regulation of cardiac muscle myoblast proliferation is controlled by a network of signaling pathways and microRNAs. Wnt/beta-catenin signaling promotes expansion of Isl-1-positive cardiac progenitor cells through regulation of FGF signaling. MicroRNAs such as miR-1 and miR-133 modulate proliferation and differentiation, with CDK9 influencing apoptosis via miR-1. Additionally, extracellular vesicles from cardiac cells can transfer microRNAs to affect recipient myoblast behavior. These regulatory layers ensure precise control of myoblast numbers during heart development.
positive regulation of cardiac muscle myoblast proliferation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CTNNB1 | Congenital heart defects | Cardiac-specific knockout mouse |
| CDK9 | Cardiac hypertrophy, apoptosis | Overexpression in HL-1 cells |
| MIR1-1 | Arrhythmia, hypertrophy | Knockout in zebrafish |
| FGF10 | Heart development defects | Knock-in reporter mouse |
| ISL1 | Cardiac progenitor dysfunction | Inducible knockout in mice |
Congenital Heart Defects
Dysregulation of cardiac muscle myoblast proliferation can lead to congenital heart defects due to insufficient progenitor expansion. Wnt/beta-catenin signaling, which promotes proliferation, is critical for proper heart formation; its disruption results in structural abnormalities.
Cardiac Regeneration Failure
After myocardial infarction, the adult heart has limited regenerative capacity partly because cardiac myoblast proliferation is not robustly activated. Understanding positive regulators like FGF signaling could inform strategies to enhance regeneration.
MicroRNA-Related Cardiac Pathologies
Altered expression of microRNAs such as miR-1 and miR-133, which regulate myoblast proliferation, is associated with cardiac hypertrophy and arrhythmias. CDK9 modulation of miR-1 affects myoblast apoptosis, linking to disease.
From positive regulation of cardiac muscle myoblast proliferation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X promote cardiac myoblast proliferation? | CRISPR knockout in HL-1 cells |
| Does point mutation in gene Y affect proliferation? | CRISPR point mutation knock-in in iPSCs |
| Does overexpression of gene Z enhance proliferation? | Lentiviral overexpression in primary myoblasts |
| Does tagged protein localize to proliferating myoblasts? | CRISPR knock-in of fluorescent tag |
| Does gene W regulate proliferation in vivo? | Cardiac-specific conditional knockout mouse |
| Does microRNA M affect proliferation? | MicroRNA mimic/inhibitor transfection |
How to Study the positive regulation of cardiac muscle myoblast proliferation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Gene requirement for proliferation | Identify positive regulators |
| RNA-seq | Transcriptional changes | Pathway analysis |
| MicroRNA profiling | miRNA expression | Identify regulatory miRNAs |
| EdU incorporation | DNA synthesis | Proliferation rate |
| Western blot | Protein expression | Validate signaling changes |
| Immunofluorescence | Protein localization | Assess proliferation markers |
| Flow cytometry | Cell cycle distribution | Quantify proliferation |
| Extracellular vesicle isolation | miRNA cargo | Study intercellular communication |
CRISPR Screening
Genome-wide CRISPR knockout screens can identify genes that positively regulate cardiac myoblast proliferation. Libraries targeting kinases, transcription factors, and signaling molecules are transduced into cardiac myoblasts, followed by proliferation assays to enrich for sgRNAs that alter growth.
RNA Sequencing
RNA-seq of cardiac myoblasts under proliferative conditions reveals transcriptomic changes, including upregulation of cell cycle genes and downregulation of differentiation markers. This helps identify pathways downstream of Wnt/beta-catenin and FGF signaling.
MicroRNA Profiling
MicroRNA profiling of cardiac cells and their extracellular vesicles identifies miRNAs that regulate proliferation. For example, miR-1 and miR-133 are differentially expressed during myoblast proliferation and differentiation.
Imaging and Proliferation Assays
EdU incorporation, Ki-67 staining, and live-cell imaging quantify proliferation rates. These methods are used to validate hits from screens and to assess the effects of gene knockouts or overexpression.
How CRISPR Can Be Used to Study GO:0110024 positive regulation of cardiac muscle myoblast proliferation
Knockout
CRISPR knockout of candidate genes in cardiac myoblasts (e.g., CTNNB1, CDK9) can determine whether they are necessary for proliferation. Loss of positive regulators reduces proliferation, which can be rescued by overexpression.
Point Mutation
Introducing specific point mutations (e.g., in CTNNB1 to stabilize beta-catenin) can mimic activating events that enhance proliferation. This helps dissect the contribution of individual phosphorylation sites or domains.
Knock-in
Knock-in of reporter genes (e.g., fluorescent tags) into endogenous loci allows real-time tracking of proliferation regulators. Tagged knock-in of ISL1 or MEF2C enables lineage tracing and purification of proliferating myoblasts.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression of genes like FGF10 or WNT3A can drive proliferation, providing gain-of-function evidence. This is useful for identifying sufficiency of a factor.
How EDITGENE Supports positive regulation of cardiac muscle myoblast proliferation Research
Researchers studying positive regulation of cardiac muscle myoblast proliferation-related genes often need to determine whether a candidate gene is causally involved in driving or sustaining proliferation. EDITGENE provides comprehensive CRISPR-based services to enable such functional studies with precision and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of cardiac muscle myoblast proliferation research.
Frequently Asked Questions About positive regulation of cardiac muscle myoblast proliferation
What is GO:0110024?
GO:0110024 is the Gene Ontology term for positive regulation of cardiac muscle myoblast proliferation, describing any process that activates or increases the frequency, rate or extent of cardiac muscle myoblast proliferation.
What genes are involved in positive regulation of cardiac muscle myoblast proliferation?
Key genes include CTNNB1 (beta-catenin), ISL1, FGF10, CDK9, and MEF2C, which are part of Wnt/beta-catenin and FGF signaling pathways.
How is cardiac muscle myoblast proliferation regulated?
It is regulated by signaling pathways such as Wnt/beta-catenin and FGF, as well as microRNAs like miR-1 and miR-133, which modulate proliferation and differentiation.
What diseases are associated with dysregulation of cardiac myoblast proliferation?
Dysregulation can lead to congenital heart defects, impaired cardiac regeneration after injury, and microRNA-related cardiac pathologies such as hypertrophy and arrhythmias.
What research methods are used to study positive regulation of cardiac muscle myoblast proliferation?
Common methods include CRISPR knockout screens, RNA-seq, microRNA profiling, EdU incorporation, and immunofluorescence for proliferation markers.
How can CRISPR be used to study cardiac myoblast proliferation?
CRISPR can create knockout, point mutation, knock-in, and overexpression models to test the necessity and sufficiency of candidate genes in driving proliferation.
What is the role of Wnt/beta-catenin signaling in cardiac myoblast proliferation?
Wnt/beta-catenin signaling promotes the expansion of Isl-1-positive cardiac progenitor cells through regulation of FGF signaling, thereby increasing cardiac myoblast proliferation.
Which microRNAs regulate cardiac myoblast proliferation?
miR-1 and miR-133 are key microRNAs that modulate cardiac myoblast proliferation and differentiation, with CDK9 influencing miR-1 expression.
What cell models are available for studying cardiac myoblast proliferation?
HL-1 cardiac cells and primary cardiac myoblasts are commonly used, and can be engineered with CRISPR for functional studies.
How does CDK9 affect cardiac myoblast proliferation?
CDK9 regulates apoptosis of myoblast cells by modulating microRNA-1 expression, thereby influencing the balance between proliferation and cell death.
Conclusion
Positive regulation of cardiac muscle myoblast proliferation (GO:0110024) is a critical biological process for heart development and regeneration. Key signaling pathways, including Wnt/beta-catenin and FGF, along with microRNAs such as miR-1 and miR-133, orchestrate this process. Dysregulation contributes to congenital heart defects and impaired cardiac repair. Advances in CRISPR-based models and high-throughput screening will continue to uncover novel regulators and therapeutic targets. EDITGENE provides essential tools to accelerate this research.
References
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- 4. Tarhriz V et al.. 2018. CDK9 Regulates Apoptosis of Myoblast Cells by Modulation of microRNA-1 Expression.. J Cell Biochem 119(1):547-554 PMID: 28608935
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