GO:0060045 positive regulation of cardiac muscle cell proliferation: Signaling Pathways, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0060045 describes any process that activates or increases the frequency, rate or extent of cardiac muscle cell proliferation, a central mechanism of heart growth and regeneration.
• PTMA controls cardiomyocyte proliferation and cardiac repair by enhancing STAT3 acetylation, providing a direct molecular entry point into this GO term.
• Non-coding RNAs are established regulators of cardiac regeneration and can modulate cardiomyocyte proliferation programs.
• Muscle satellite cell dysfunction illustrates how proliferative failure contributes to neuromuscular and cardiac muscle pathology.
• Fulminant viral myocarditis involves spatiotemporal changes in cardiac cell states that intersect with proliferative and inflammatory signaling.
• CRISPR knockout, point-mutation, knock-in and overexpression models are essential to test causality of candidate regulators of cardiac muscle cell proliferation.
Description
GO:0060045, positive regulation of cardiac muscle cell proliferation, is a biological process term that captures any signal or molecular event that activates or increases the frequency, rate or extent of cardiac muscle cell proliferation. In the heart, cardiomyocytes are the principal cardiac muscle cells, and their ability to proliferate is a major determinant of embryonic heart growth, neonatal regeneration and the response to injury. Understanding which upstream regulators and downstream effectors drive this process is therefore central to cardiac regenerative biology and to the development of therapies for heart disease. The term is deliberately broad: it includes extracellular cues, receptor-proximal signaling, transcriptional and epigenetic control, and non-coding RNA networks that converge on the cardiomyocyte cell cycle. Because cardiac muscle cell proliferation is tightly coupled to developmental timing and injury context, researchers frequently study it using spatiotemporal transcriptomics, lineage tracing and functional perturbation. Muscle satellite cell biology provides a useful comparative framework, since satellite cell dysfunction in neuromuscular disorders demonstrates how failure of proliferative expansion contributes to muscle disease. This article integrates the QuickGO definition with verified PubMed literature to explain the mechanism, key genes, disease relevance and experimental strategies for studying GO:0060045.
positive regulation of cardiac muscle cell proliferation At A Glance
| GO ID | GO:0060045 |
|---|---|
| GO term | positive regulation of cardiac muscle cell proliferation |
| Ontology | biological_process |
| Synonym | positive regulation of heart muscle cell proliferation |
| Definition | Any process that activates or increases the frequency, rate or extent of cardiac muscle cell proliferation. |
| Major function | Upregulation of cardiac muscle cell division during heart development, regeneration and repair |
| Related cell type | Cardiomyocytes and cardiac muscle precursor cells |
| Key regulatory layer | Signal transduction, transcription, non-coding RNAs and epigenetic control |
| Disease relevance | Cardiac injury, myocarditis, cardiomyopathy and regenerative failure |
What Is GO:0060045?
In simple terms, GO:0060045 is the set of biological events that switch cardiac muscle cell proliferation on or turn it up. Formally, it is defined as any process that activates or increases the frequency, rate or extent of cardiac muscle cell proliferation, and it is a child of the broader regulation of cardiac muscle cell proliferation and regulation of cell population proliferation hierarchies. The term is used when a gene product, pathway or experimental intervention increases cardiomyocyte division, DNA synthesis or expansion of cardiac muscle cell numbers, rather than merely being required for proliferation. It is a biological process term, so it is assigned to gene products whose activity positively modulates the proliferative behavior of cardiac muscle cells.
Why Is positive regulation of cardiac muscle cell proliferation Important in Cell Biology?
Positive regulation of cardiac muscle cell proliferation is important because the heart has very limited regenerative capacity in adult mammals, and the ability to reactivate or enhance cardiomyocyte proliferation is a major therapeutic goal after myocardial injury. The process also underlies normal heart development, where precise control of cardiac muscle cell number determines chamber size and function. Dysregulation of proliferative signaling can contribute to maladaptive remodeling, while insufficient proliferation limits recovery after injury. In addition, comparative studies of muscle satellite cell dysfunction show that failure of proliferative expansion is a shared theme in muscle pathology, reinforcing the broader biological importance of positive regulation of muscle cell proliferation. Finally, because the process is controlled by non-coding RNAs and signaling pathways, it offers many druggable and genetically tractable nodes for experimental intervention.
• Drives embryonic heart growth by expanding the cardiac muscle cell population.
• Supports neonatal cardiac regeneration and repair after injury.
• Is a therapeutic target for reactivating adult cardiomyocyte proliferation.
• Is modulated by non-coding RNAs that can be manipulated experimentally.
• Intersects with inflammatory and immune signaling in myocarditis.
• Is relevant to diabetic cardiomyopathy and oxidative stress pathways.
• Provides a conceptual link to muscle satellite cell dysfunction in neuromuscular disease.
• Can be studied with spatiotemporal transcriptomics to resolve cell-state changes.
• Offers entry points for CRISPR-based functional genomics of cardiac proliferation.
• Helps interpret cardiac repair phenotypes in endocardial and remote injury models.
What Happens During positive regulation of cardiac muscle cell proliferation?
Initiation by extracellular and receptor-proximal signals
In simple terms: The process starts when outside signals tell cardiac muscle cells to divide.
Positive regulation of cardiac muscle cell proliferation begins with extracellular cues and receptor-proximal signaling that license cardiomyocytes to re-enter the cell cycle. Growth factor and stress-responsive pathways can converge on transcriptional programs that increase proliferative capacity, and non-coding RNAs can act at this early stage to amplify or dampen the response. In myocarditis, spatiotemporal transcriptomics has revealed dynamic changes in cardiac cell states that include proliferative and inflammatory programs, indicating that initiation signals are context-dependent. Comparative evidence from muscle satellite cells shows that failure at the initiation step can lead to proliferative exhaustion and muscle disease.
Signal transduction and transcriptional activation
In simple terms: Signals are relayed into the nucleus, where genes that drive division are switched on.
Once initiated, positive regulation of cardiac muscle cell proliferation depends on signal transduction cascades that activate transcription factors and coactivators controlling cell-cycle genes. PTMA has been shown to control cardiomyocyte proliferation and cardiac repair by enhancing STAT3 acetylation, directly linking a chromatin-associated regulator to this GO term. Non-coding RNAs can also modulate these transcriptional outputs, providing an additional layer of control over cardiac regeneration. The net effect is increased expression of genes that promote DNA synthesis and mitosis in cardiac muscle cells.
Cell-cycle re-entry and proliferative expansion
In simple terms: Cardiac muscle cells move through the cell cycle and increase in number.
The defining outcome of GO:0060045 is increased frequency, rate or extent of cardiac muscle cell proliferation, which requires cell-cycle re-entry and progression. Experimental enhancement of PTMA-STAT3 signaling promotes cardiomyocyte proliferation and improves cardiac repair, demonstrating that this step is functionally important. Non-coding RNA networks have been implicated in regulating the balance between proliferation and differentiation during cardiac regeneration. In disease contexts such as fulminant viral myocarditis, single-cell and spatial approaches have identified proliferative cell states alongside immune activation, highlighting the dynamic nature of this step.
Integration with injury and repair programs
In simple terms: The proliferative response is coordinated with the heart's injury and repair signals.
Positive regulation of cardiac muscle cell proliferation does not occur in isolation; it is integrated with injury, inflammatory and repair programs. In endocardium-centered injury models, targeting lysozyme 2 promotes rapid recovery by modulating remote injury signals, illustrating how non-myocyte signals can influence cardiac repair. Diabetic cardiomyopathy studies show that FGF1(ΔHBS) protects mitochondria and reduces oxidative stress via AMPK/Nur77 suppression, a pathway that can indirectly shape the cardiac environment in which proliferation is regulated. These examples show that positive regulation of cardiac muscle cell proliferation is embedded in a broader tissue response network.
Key Genes Involved in GO:0060045 positive regulation of cardiac muscle cell proliferation
The following genes and proteins have been experimentally linked to cardiac muscle cell proliferation, cardiac repair or closely related regulatory processes in the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PTMA | Controls cardiomyocyte proliferation and cardiac repair by enhancing STAT3 acetylation | Direct positive regulator of cardiac muscle cell proliferation and repair |
| STAT3 | Acetylation-enhanced signaling downstream of PTMA in cardiomyocytes | Effector node for proliferative and repair responses |
| MEF2D | Transcription factor studied in leukemia biology | Provides a comparative MEF2-family transcription factor framework |
| KCNA5 | Voltage-gated K+ channel sensitive to SGK3 | Ion-channel context for cardiac excitability and signaling |
| FGF1 | FGF1(ΔHBS) maintains mitochondrial homeostasis and reduces oxidative stress via AMPK/Nur77 | Modulates the cardiac environment relevant to repair |
| Nur77 | Suppressed by FGF1(ΔHBS) in diabetic cardiomyopathy | Stress-responsive nuclear receptor in cardiac injury |
| AMPK | Mediates metabolic and oxidative stress responses in diabetic cardiomyopathy | Upstream metabolic regulator of cardiac stress |
| Lysozyme 2 | Endocardial target that modulates remote injury signals and promotes recovery | Non-myocyte regulator of cardiac repair |
| SGK3 | Serum- and glucocorticoid-regulated kinase that modulates KCNA5 | Kinase context for ion-channel regulation |
| Non-coding RNAs | Regulate cardiac regeneration programs | Broad class of regulators of cardiac proliferation |
| Muscle satellite cell genes | Control satellite cell function and proliferation | Comparative model for proliferative failure in muscle |
| Inflammatory mediators | Shape cardiac cell states in fulminant viral myocarditis | Context for injury-associated proliferative responses |
| Endocardial signals | Modulate remote injury and recovery | Niche signals influencing cardiac repair |
| Mitochondrial regulators | Maintain mitochondrial homeostasis in cardiomyopathy | Support metabolic competence for proliferation |
| Oxidative stress regulators | Reduce oxidative stress in diabetic cardiomyopathy | Modulate the redox environment of cardiac cells |
| Spatiotemporal cell-state markers | Resolve cardiac cell states in myocarditis | Tool for mapping proliferative populations |
How Is positive regulation of cardiac muscle cell proliferation Regulated?
Positive regulation of cardiac muscle cell proliferation is controlled by multiple layers of regulation. At the signaling level, PTMA enhances STAT3 acetylation to promote cardiomyocyte proliferation and cardiac repair, establishing a direct positive regulatory axis. Non-coding RNAs form an additional regulatory layer that can promote or restrict cardiac regeneration programs. Metabolic and stress pathways, including AMPK/Nur77 signaling, shape the cardiac environment and can indirectly influence proliferative capacity. Inflammatory and immune signals during fulminant viral myocarditis alter cardiac cell states and may intersect with proliferative programs. Endocardial signals, such as those modulated by lysozyme 2, can also affect remote injury responses and recovery. Finally, comparative studies of muscle satellite cells show that intrinsic proliferative regulators are essential for maintaining muscle cell populations, providing a conceptual parallel for cardiac muscle.
positive regulation of cardiac muscle cell proliferation and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| PTMA | Cardiac injury and impaired repair | Cardiomyocyte-specific overexpression and knockout models |
| STAT3 | Cardiac repair signaling | Acetylation-mimetic and acetylation-deficient knock-in models |
| FGF1 | Diabetic cardiomyopathy and oxidative stress | FGF1(ΔHBS) overexpression in diabetic cardiomyopathy models |
| Lysozyme 2 | Endocardial injury and remote recovery | Endocardial-specific knockout and overexpression models |
| Non-coding RNAs | Cardiac regeneration failure | Non-coding RNA gain- and loss-of-function models |
Cardiac injury and regenerative failure
Loss of cardiomyocytes after injury is poorly compensated because adult cardiac muscle cell proliferation is limited. Strategies that positively regulate this process, such as enhancing PTMA-STAT3 signaling, have been shown to promote cardiomyocyte proliferation and improve cardiac repair in experimental models. Non-coding RNAs represent another avenue for modulating regenerative failure. These findings support the view that insufficient positive regulation of cardiac muscle cell proliferation is a key barrier to cardiac regeneration.
Fulminant viral myocarditis
Fulminant viral myocarditis involves rapid and severe cardiac dysfunction, and spatiotemporal transcriptomics has been used to dissect its pathogenesis at single-cell resolution. These studies reveal dynamic cardiac cell states, including inflammatory and proliferative programs, that may influence recovery. Understanding how positive regulation of cardiac muscle cell proliferation is affected during myocarditis could inform strategies to support cardiac repair.
Diabetic cardiomyopathy and metabolic stress
Diabetic cardiomyopathy is characterized by mitochondrial dysfunction and oxidative stress, and FGF1(ΔHBS) has been shown to prevent it by maintaining mitochondrial homeostasis and reducing oxidative stress via AMPK/Nur77 suppression. Because metabolic stress can impair cardiac cell function, pathways like this may indirectly constrain positive regulation of cardiac muscle cell proliferation. Targeting metabolic regulators could therefore help preserve a permissive environment for cardiac repair.
Neuromuscular disorders and satellite cell dysfunction
Muscle satellite cell dysfunction is increasingly recognized as a contributor to neuromuscular disorders, and proliferative failure is a shared theme in these conditions. Although satellite cells are distinct from cardiomyocytes, the principles of proliferative regulation and exhaustion provide a comparative framework for understanding positive regulation of cardiac muscle cell proliferation. This cross-tissue perspective can guide hypothesis generation for cardiac regenerative research.
From positive regulation of cardiac muscle cell proliferation-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is PTMA required for cardiomyocyte proliferation? | PTMA knockout in cardiac muscle cells |
| Does STAT3 acetylation drive cardiac repair? | STAT3 acetylation-mimetic point-mutation knock-in |
| Can a candidate gene enhance cardiac muscle cell proliferation? | Cardiomyocyte-specific overexpression |
| What is the spatiotemporal pattern of proliferative cells in myocarditis? | Spatiotemporal transcriptomics in myocarditis models |
| Does endocardial lysozyme 2 modulate remote injury recovery? | Endocardial-specific knockout and rescue |
| Can non-coding RNAs be targeted to promote regeneration? | Non-coding RNA knockout and overexpression models |
How to Study the positive regulation of cardiac muscle cell proliferation Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Spatiotemporal transcriptomics | Cell-state and spatial gene expression | Mapping proliferative programs in myocarditis |
| CRISPR knockout | Loss-of-function causality | Testing requirement of candidate genes |
| CRISPR point mutation | Specific residue or modification effects | Testing STAT3 acetylation sites |
| CRISPR knock-in | Tagged or reporter alleles | Tracking proliferation and repair signals |
| Overexpression | Gain-of-function effects | Enhancing cardiomyocyte proliferation |
| Non-coding RNA profiling | Expression of regulatory RNAs | Identifying regeneration-associated RNAs |
| Mitochondrial and oxidative stress assays | Metabolic and redox status | Evaluating permissive environment for proliferation |
| Endocardial injury models | Remote injury signaling | Testing niche-derived regulators of repair |
Spatiotemporal transcriptomics
Spatiotemporal transcriptomics enables mapping of cardiac cell states and proliferative programs in situ, as demonstrated in studies of fulminant viral myocarditis. This approach can identify where and when positive regulation of cardiac muscle cell proliferation occurs in the injured heart.
Functional perturbation with CRISPR
CRISPR knockout, point-mutation, knock-in and overexpression models allow direct testing of whether a candidate gene causally regulates cardiac muscle cell proliferation. For example, manipulating PTMA-STAT3 signaling has been used to demonstrate effects on cardiomyocyte proliferation and repair.
Non-coding RNA profiling and manipulation
Non-coding RNAs are key regulators of cardiac regeneration, and profiling plus gain- and loss-of-function experiments can reveal their role in positive regulation of cardiac muscle cell proliferation. Such studies help distinguish drivers from bystanders in regenerative programs.
Metabolic and oxidative stress assays
Because metabolic stress can constrain cardiac cell function, assays of mitochondrial homeostasis and oxidative stress are relevant to the permissive environment for proliferation. FGF1(ΔHBS) studies illustrate how AMPK/Nur77 signaling can be interrogated in this context.
How CRISPR Can Be Used to Study GO:0060045 positive regulation of cardiac muscle cell proliferation
Knockout
CRISPR knockout is used to delete candidate positive regulators of cardiac muscle cell proliferation and test whether they are required for cardiomyocyte division and cardiac repair. For example, loss-of-function studies of PTMA-STAT3 signaling can reveal its necessity in proliferation and repair. Knockout models are also valuable for non-coding RNA loci and endocardial regulators such as lysozyme 2.
Point Mutation
CRISPR point mutation enables precise modification of residues that control signaling output, such as acetylation sites on STAT3 downstream of PTMA. This approach distinguishes specific post-translational regulatory events from general loss-of-function effects. Point mutations can also be used to dissect ion-channel or kinase regulatory sites relevant to cardiac signaling.
Knock-in
CRISPR knock-in can introduce reporters, tags or human disease variants to track and manipulate positive regulation of cardiac muscle cell proliferation. Tagged alleles allow visualization of protein localization and dynamics in cardiomyocytes. Knock-in strategies are also useful for modeling disease-associated variants in cardiac repair pathways.
Overexpression
CRISPR-mediated overexpression or transgenic overexpression can test whether a candidate gene is sufficient to enhance cardiac muscle cell proliferation. Overexpression of PTMA-STAT3 pathway components has been used to promote cardiomyocyte proliferation and cardiac repair. Overexpression models are also applicable to non-coding RNAs and metabolic regulators such as FGF1(ΔHBS).
How EDITGENE Supports positive regulation of cardiac muscle cell proliferation Research
Researchers studying positive regulation of cardiac muscle cell proliferation-related genes often need to determine whether a candidate gene is causally involved in cardiomyocyte division, repair or disease progression. EDITGENE provides end-to-end CRISPR cell model and screening services to move from correlation to causation with publication-ready validation.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of cardiac muscle cell proliferation research.
Frequently Asked Questions About positive regulation of cardiac muscle cell proliferation
What is GO:0060045?
GO:0060045 is the Gene Ontology biological process term for positive regulation of cardiac muscle cell proliferation, defined as any process that activates or increases the frequency, rate or extent of cardiac muscle cell proliferation.
What does positive regulation of cardiac muscle cell proliferation mean in simple terms?
It means the biological events that switch on or increase the division of cardiac muscle cells, such as cardiomyocytes.
What genes are involved in positive regulation of cardiac muscle cell proliferation?
Genes and proteins experimentally linked to this process include PTMA and STAT3, which control cardiomyocyte proliferation and cardiac repair, as well as non-coding RNAs that regulate cardiac regeneration.
How does PTMA regulate cardiac muscle cell proliferation?
PTMA controls cardiomyocyte proliferation and cardiac repair by enhancing STAT3 acetylation, providing a direct positive regulatory mechanism.
Why is cardiac muscle cell proliferation important for heart repair?
Because adult cardiomyocyte proliferation is limited, enhancing it is a major strategy to improve cardiac repair after injury.
What diseases are associated with defects in cardiac muscle cell proliferation?
Cardiac injury, regenerative failure, fulminant viral myocarditis and diabetic cardiomyopathy are relevant contexts.
How can researchers study GO:0060045 experimentally?
Spatiotemporal transcriptomics, CRISPR knockout, point mutation, knock-in, overexpression and non-coding RNA profiling are commonly used.
What is the role of non-coding RNAs in cardiac regeneration?
Non-coding RNAs are established regulators of cardiac regeneration and can modulate cardiomyocyte proliferation programs.
Can CRISPR be used to identify new regulators of cardiac muscle cell proliferation?
Yes, pooled CRISPR library screening can identify novel positive regulators of cardiac muscle cell proliferation in an unbiased way.
What model systems are suitable for studying positive regulation of cardiac muscle cell proliferation?
Cardiomyocyte-specific knockout, point-mutation knock-in, overexpression models and spatiotemporal transcriptomics in myocarditis models are suitable.
Conclusion
GO:0060045, positive regulation of cardiac muscle cell proliferation, is a central biological process for heart development, regeneration and repair. Verified literature shows that PTMA-STAT3 signaling directly promotes cardiomyocyte proliferation and cardiac repair, while non-coding RNAs provide additional regulatory control. Disease contexts such as fulminant viral myocarditis and diabetic cardiomyopathy further highlight the importance of this process and its integration with inflammatory and metabolic pathways. Comparative insights from muscle satellite cell dysfunction reinforce the broader principle that proliferative failure contributes to muscle pathology. CRISPR-based knockout, point-mutation, knock-in, overexpression and library screening approaches, combined with spatiotemporal transcriptomics, offer a rigorous path to identify and validate causal regulators of this process.
References
- 1. Ganassi M et al.. 2022. Involvement of muscle satellite cell dysfunction in neuromuscular disorders: Expanding the portfolio of satellite cell-opathies.. Eur J Transl Myol 32(1) PMID: 35302338
- 2. Liu N et al.. 2025. PTMA controls cardiomyocyte proliferation and cardiac repair by enhancing STAT3 acetylation.. Sci Adv 11(21):eadt9446 PMID: 40408476
- 3. Li H et al.. 2025. Spatiotemporal transcriptomics elucidates the pathogenesis of fulminant viral myocarditis.. Signal Transduct Target Ther 10(1):59 PMID: 39924580
- 4. Wang D et al.. 2021. FGF1(ΔHBS) prevents diabetic cardiomyopathy by maintaining mitochondrial homeostasis and reducing oxidative stress via AMPK/Nur77 suppression.. Signal Transduct Target Ther 6(1):133 PMID: 33762571
- 5. Fan C et al.. 2025. Targeting lysozyme 2 in endocardium promotes rapid recovery by modulating remote injury signals.. Cell Stem Cell 32(10):1563-1576.e11 PMID: 40967223
- 6. Zhang P et al.. 2024. The Molecular and Biological Function of MEF2D in Leukemia.. Adv Exp Med Biol 1459:379-403 PMID: 39017853
- 7. van der Ven CFT et al.. 2020. Non-coding RNAs in Cardiac Regeneration.. Adv Exp Med Biol 1229:163-180 PMID: 32285411
- 8. Ahmed M et al.. 2016. SGK3 Sensitivity of Voltage Gated K+ Channel Kv1.5 (KCNA5).. Cell Physiol Biochem 38(1):359-67 PMID: 26824455
