GO:0014834 skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration: Self-Renewal Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0014834 describes how the number of skeletal muscle satellite cells is maintained during muscle regeneration through asymmetric division, symmetric division, and dedifferentiation of myoblasts.
• Satellite cells are the resident stem cells of skeletal muscle and are essential for postnatal growth, maintenance of muscle mass, and regeneration after injury.
• Disruption of satellite cell maintenance contributes to neuromuscular disorders collectively termed satellite cell-opathies, including muscular dystrophies and age-related sarcopenia.
• Key signaling pathways regulating satellite cell self-renewal include Wnt, Notch, and hypoxic signaling, which control quiescence, activation, and return to quiescence.
• POGLUT1, a glycosyltransferase, is critical for satellite cell niche maintenance and its loss causes LGMDR21, a limb-girdle muscular dystrophy.
• CRISPR-based knockout, knock-in, and overexpression models enable causal testing of candidate genes in satellite cell maintenance and regeneration.
Description
Skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration (GO:0014834) is a biological process that ensures the satellite cell pool is not depleted during muscle repair. Satellite cells are Pax7-positive stem cells located between the sarcolemma and basal lamina of muscle fibers, and they are indispensable for postnatal muscle growth and regeneration. Without maintenance mechanisms, repeated rounds of injury and repair would exhaust the stem cell pool, leading to impaired regeneration and muscle wasting. This GO term is therefore central to understanding muscle stem cell biology and to developing therapies for neuromuscular disorders. Researchers study GO:0014834 to identify genes and pathways that preserve satellite cell number and function, with implications for muscular dystrophies, sarcopenia, and regenerative medicine.
skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration At A Glance
| GO ID | GO:0014834 |
|---|---|
| GO term | skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration |
| Ontology | biological_process |
| Synonym | satellite cell compartment self-renewal involved in skeletal muscle regeneration; satellite cell population maintenance; satellite cell self-renewal |
| Major function | Maintains the number of skeletal muscle satellite cells during muscle regeneration via asymmetric division, symmetric division, and dedifferentiation of myoblasts |
| Related cell type | Skeletal muscle satellite cells (Pax7+ resident stem cells) |
| Related processes | Muscle regeneration, stem cell self-renewal, quiescence, activation, and differentiation |
| Key signaling pathways | Wnt, Notch, hypoxic signaling, and exercise-induced overload |
What Is GO:0014834?
GO:0014834 refers to any process by which the number of skeletal muscle satellite cells in a skeletal muscle is maintained during muscle regeneration. According to the QuickGO definition, at least three mechanisms achieve this: asymmetric division of satellite stem cells keeps stem cell numbers constant; symmetric division amplifies the number of satellite stem cells; and some adult skeletal muscle myoblasts (descendants of activated satellite cells) can revert to quiescent satellite cells, replenishing the overall pool.
Why Is skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration Important in Cell Biology?
GO:0014834 is important because satellite cell maintenance is a prerequisite for lifelong muscle regeneration and for preventing stem cell exhaustion. Defects in this process are linked to neuromuscular disorders such as satellite cell-opathies, muscular dystrophies, and age-related loss of muscle mass. Understanding the molecular regulators of satellite cell self-renewal can inform therapeutic strategies for muscle repair and regeneration.
• Satellite cells are the primary source of new myonuclei for muscle growth and repair.
• Asymmetric division preserves the stem cell pool while generating committed myoblasts.
• Symmetric division expands the satellite cell population during regeneration.
• Dedifferentiation of myoblasts back to quiescent satellite cells replenishes the pool.
• Impaired satellite cell maintenance contributes to muscular dystrophies and satellite cell-opathies.
• Age-related decline in satellite cell function is associated with sarcopenia and reduced regenerative capacity.
• Exercise and functional overload enhance satellite cell properties and may counteract aging effects.
• Hypoxic signaling influences satellite cell quiescence and maintenance.
• Wnt signaling regulates satellite cell activation and self-renewal during regeneration.
• POGLUT1 mutations impair satellite cell niche and cause LGMDR21.
What Happens During skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration?
Asymmetric Division of Satellite Stem Cells
In simple terms: A stem cell divides into one new stem cell and one cell that will become muscle, keeping the stem cell pool steady.
Asymmetric division ensures that satellite stem cell numbers are kept constant during muscle regeneration. This process generates one daughter cell that remains a satellite stem cell and another that commits to myogenic differentiation, thereby maintaining the pool while supplying new myoblasts for repair.
Symmetric Division and Amplification
In simple terms: Stem cells can also divide to make two stem cells, increasing the pool when more stem cells are needed.
Symmetric division of satellite stem cells amplifies the number of satellite stem cells during regeneration. This expansion is important for providing sufficient progenitor cells for efficient muscle repair after injury.
Dedifferentiation of Myoblasts to Quiescent Satellite Cells
In simple terms: Some muscle precursor cells can go back to being quiet stem cells, refilling the stem cell pool.
Some adult skeletal muscle myoblasts, which are descendants of activated satellite cells, can develop back into quiescent satellite cells, replenishing the overall pool of satellite cells. This dedifferentiation-like process contributes to the maintenance of the satellite cell compartment during regeneration.
Signaling Pathways Controlling Maintenance
In simple terms: Chemical signals tell satellite cells whether to stay quiet, activate, or self-renew.
Wnt signaling plays a role in skeletal muscle development and regeneration, influencing satellite cell behavior. Hypoxic signaling also affects skeletal muscle maintenance and regeneration, including satellite cell function. These pathways integrate with niche-derived cues to regulate the balance between quiescence, activation, and self-renewal.
Role of the Satellite Cell Niche
In simple terms: The environment around the stem cell helps keep it healthy and ready to repair muscle.
The satellite cell niche, including extracellular matrix components and neighboring cells, supports satellite cell maintenance. Disruption of niche factors, such as POGLUT1, impairs satellite cell function and muscle regeneration.
Key Genes Involved in GO:0014834 skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration
The following genes and proteins are experimentally implicated in skeletal muscle satellite cell maintenance and regeneration, based on the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| PAX7 | Master regulator of satellite cell identity and quiescence | Marker for satellite cells; essential for maintenance |
| MYOD1 | Myogenic determination factor | Drives activation and differentiation of satellite cells |
| POGLUT1 | Glycosyltransferase modifying Notch receptors | Mutations cause LGMDR21; role in satellite cell niche |
| NOTCH1 | Cell fate signaling receptor | Regulates satellite cell self-renewal and differentiation |
| WNT7A | Wnt ligand | Promotes symmetric expansion of satellite stem cells |
| CTNNB1 | Wnt signaling effector (beta-catenin) | Mediates Wnt effects on satellite cells |
| HIF1A | Hypoxia-inducible factor | Links hypoxic signaling to satellite cell maintenance |
| VEGFA | Angiogenic factor | Influenced by hypoxia; supports muscle regeneration |
| MEF2C | Myogenic transcription factor | Cooperates with MyoD in differentiation |
| MYF5 | Myogenic regulatory factor | Expressed in activated satellite cells |
| CD34 | Cell surface marker | Enriches for satellite cells in some contexts |
| ITGA7 | Integrin alpha-7 | Satellite cell marker and niche adhesion |
| NCAM1 | Neural cell adhesion molecule | Satellite cell marker in some species |
| SPRY1 | Sprouty1, RTK signaling inhibitor | Regulates return to quiescence |
| DLL1 | Notch ligand | Controls asymmetric division |
| JAG1 | Notch ligand | Influences satellite cell fate |
| MSTN | Myostatin | Negative regulator of muscle growth; affects satellite cells |
| IGF1 | Insulin-like growth factor 1 | Promotes satellite cell activation and proliferation |
How Is skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration Regulated?
Satellite cell maintenance is regulated by a network of signaling pathways and niche factors. Wnt signaling influences satellite cell self-renewal and differentiation during regeneration. Hypoxic signaling, mediated in part by HIF1A, affects skeletal muscle maintenance and regeneration. Exercise and functional overload enhance satellite cell properties, suggesting mechanical and metabolic regulation. Additionally, Notch signaling through ligands such as DLL1 and JAG1 controls asymmetric division and quiescence. The glycosyltransferase POGLUT1 regulates Notch signaling and is essential for satellite cell niche maintenance.
skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| POGLUT1 | LGMDR21 (limb-girdle muscular dystrophy) | iPSC-derived myoblasts with gene correction |
| PAX7 | Satellite cell-opathy; impaired regeneration | Conditional knockout mouse |
| DMD | Duchenne muscular dystrophy | Satellite cell transplantation in mdx mice |
| HIF1A | Hypoxic signaling in muscle maintenance | Knockout or overexpression in muscle cells |
| WNT7A | Satellite cell self-renewal defects | Transgenic overexpression |
Satellite Cell-opathies and Muscular Dystrophies
Dysfunction of satellite cells is implicated in a group of neuromuscular disorders termed satellite cell-opathies, which include various muscular dystrophies. Mutations in genes such as POGLUT1 cause LGMDR21, a limb-girdle muscular dystrophy, by disrupting satellite cell niche and regeneration. These conditions highlight the importance of GO:0014834 in human disease.
Age-Related Muscle Loss (Sarcopenia)
Aging is associated with reduced satellite cell function and impaired muscle regeneration, contributing to sarcopenia. Exercise-mediated reinnervation and functional overload can enhance satellite cell properties in elderly people, suggesting potential interventions.
Neuromuscular Disorders
Satellite cell dysfunction extends to other neuromuscular disorders, expanding the portfolio of satellite cell-opathies. Understanding GO:0014834 mechanisms may inform therapeutic approaches for these conditions.
From skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X maintain satellite cell number? | Conditional knockout in Pax7-CreERT2 mice |
| Does a point mutation in gene X impair self-renewal? | Knock-in of patient mutation in iPSCs |
| Does overexpression of gene X expand satellite cells? | Transgenic overexpression in mouse muscle |
| Does gene X regulate asymmetric division? | Tagged knock-in for lineage tracing |
| Does gene X affect return to quiescence? | Inducible knockout followed by injury |
| Does gene X interact with niche factors? | Co-culture with niche cells and KO |
How to Study the skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Immunofluorescence | Satellite cell number and marker expression | Muscle cross-sections after injury |
| Lineage tracing | Fate of satellite cells and self-renewal | Genetic mouse models |
| scRNA-seq | Transcriptional heterogeneity | Satellite cell states during regeneration |
| EdU/BrdU labeling | Proliferation and symmetric division | In vitro and in vivo |
| Western blot | Protein expression of key regulators | Pathway analysis |
| CRISPR knockout | Causal role of candidate genes | In vitro myoblast models |
| Hypoxia chamber | Effect of oxygen tension | Satellite cell culture |
| Exercise intervention | Satellite cell response to overload | Human and animal studies |
Lineage Tracing and Genetic Labeling
Lineage tracing using inducible Cre recombinase under satellite cell-specific promoters (e.g., Pax7) allows researchers to follow asymmetric and symmetric divisions and quantify maintenance.
Immunofluorescence and Imaging
Immunostaining for Pax7, MyoD, and other markers on muscle sections enables assessment of satellite cell number and location during regeneration.
Transcriptomics and Single-Cell RNA Sequencing
RNA-seq and scRNA-seq reveal gene expression changes in satellite cells during activation, self-renewal, and differentiation, identifying regulators of GO:0014834.
Functional Overload and Exercise Models
Functional overload and exercise models in rodents and humans can test how mechanical stimuli affect satellite cell maintenance and regeneration.
How CRISPR Can Be Used to Study GO:0014834 skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration
Knockout
CRISPR knockout of candidate genes in myoblasts or satellite cells can test whether they are required for maintenance. For example, POGLUT1 knockout in iPSCs recapitulates LGMDR21 phenotypes.
Point Mutation
Introducing patient-specific point mutations via CRISPR base editing or HDR allows modeling of missense variants in genes like POGLUT1 and assessing their impact on satellite cell maintenance.
Knock-in
Knock-in of fluorescent reporters or tags (e.g., Pax7-GFP) enables lineage tracing and quantification of satellite cell divisions.
Overexpression
CRISPR activation or transgenic overexpression of genes such as WNT7A can test whether increased dosage expands the satellite cell pool.
How EDITGENE Supports skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration Research
Researchers studying skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration-related genes often need to determine whether a candidate gene is causally involved in maintaining the stem cell pool, and to dissect the molecular mechanisms by which it acts. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration research.
Frequently Asked Questions About skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration
What is GO:0014834?
GO:0014834 is the Gene Ontology term for skeletal muscle satellite cell maintenance involved in skeletal muscle regeneration, describing how the satellite cell pool is maintained during muscle repair.
What genes are involved in skeletal muscle satellite cell maintenance?
Key genes include PAX7, MYOD1, POGLUT1, NOTCH1, WNT7A, CTNNB1, HIF1A, and SPRY1, among others.
How do satellite cells self-renew?
Satellite cells self-renew through asymmetric division, symmetric division, and dedifferentiation of myoblasts back to quiescent satellite cells.
Why is satellite cell maintenance important for muscle regeneration?
It prevents stem cell exhaustion and ensures a continuous supply of myoblasts for repair after injury.
What diseases are linked to defective satellite cell maintenance?
Satellite cell-opathies, muscular dystrophies such as LGMDR21, and age-related sarcopenia.
What signaling pathways regulate satellite cell maintenance?
Wnt, Notch, and hypoxic signaling pathways, as well as exercise-induced mechanical cues.
How can CRISPR be used to study satellite cell maintenance?
CRISPR knockout, knock-in, point mutation, and overexpression models allow causal testing of candidate genes in myoblasts and satellite cells.
What is the role of POGLUT1 in satellite cells?
POGLUT1 is a glycosyltransferase that modifies Notch receptors and is essential for satellite cell niche maintenance; mutations cause LGMDR21.
Does exercise affect satellite cell maintenance?
Yes, functional overload and exercise enhance satellite cell properties and may improve maintenance in aging muscle.
What methods are used to study GO:0014834?
Lineage tracing, immunofluorescence, scRNA-seq, EdU labeling, and functional overload models are commonly used.
Conclusion
GO:0014834 encompasses the essential mechanisms that preserve the skeletal muscle satellite cell pool during regeneration, including asymmetric and symmetric division and myoblast dedifferentiation. Dysregulation of these processes contributes to muscular dystrophies, satellite cell-opathies, and sarcopenia. Continued research using CRISPR-based models and advanced omics will further elucidate the molecular players and therapeutic opportunities.
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. Coletti C et al.. 2022. Exercise-mediated reinnervation of skeletal muscle in elderly people: An update.. Eur J Transl Myol 32(1) PMID: 35234025
- 3. Pircher T et al.. 2021. Hypoxic Signaling in Skeletal Muscle Maintenance and Regeneration: A Systematic Review.. Front Physiol 12:684899 PMID: 34248671
- 4. Ortiz-Vitali JL et al.. 2023. Disease modeling and gene correction of LGMDR21 iPSCs elucidates the role of POGLUT1 in skeletal muscle maintenance, regeneration, and the satellite cell niche.. Mol Ther Nucleic Acids 33:683-697 PMID: 37650119
- 5. Girardi F et al.. 2018. Wnt Signaling in Skeletal Muscle Development and Regeneration.. Prog Mol Biol Transl Sci 153:157-179 PMID: 29389515
- 6. Chen B et al.. 2019. The role of satellite and other functional cell types in muscle repair and regeneration.. J Muscle Res Cell Motil 40(1):1-8 PMID: 30968305
- 7. Pallafacchina G et al.. 2013. Role of satellite cells in muscle growth and maintenance of muscle mass.. Nutr Metab Cardiovasc Dis 23 Suppl 1:S12-8 PMID: 22621743
- 8. Fujimaki S et al.. 2016. Functional Overload Enhances Satellite Cell Properties in Skeletal Muscle.. Stem Cells Int 2016:7619418 PMID: 26779264
