GO:0060047 heart contraction: Physiology, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0060047 (heart contraction) is the biological process by which the heart decreases in volume in a characteristic way to propel blood through the body.
• Contraction is driven by excitation-contraction coupling, in which calcium entry and sarcoplasmic reticulum release activate the myofilament apparatus.
• The force and kinetics of contraction can be mapped quantitatively from calcium and force-pCa relationships to whole-heart function.
• Myosin-targeting small molecules such as omecamtiv mecarbil and mavacamten act on the same myosin pocket yet produce opposite effects on contraction.
• Altered calcium physiology links excitation, contraction and transcriptional remodeling in heart failure.
• Zebrafish larvae allow simultaneous imaging of calcium and contraction in the beating heart, providing a tractable in vivo model.
Description
Heart contraction (GO:0060047) is the multicellular organismal process in which the heart decreases in volume in a characteristic way to propel blood through the body. It is the mechanical output of cardiac muscle and pump function, integrating electrical excitation, calcium signaling and myofilament cycling. Because contraction is essential for systemic perfusion, its molecular and cellular determinants are central to cardiovascular physiology and disease research. Quantitative descriptions of contraction and relaxation, including force-pCa mapping to whole-heart behavior, provide a framework for comparing normal and failing hearts. Experimental models such as zebrafish larvae enable simultaneous imaging of calcium and contraction in the beating heart, linking cellular events to organ-level function. Pharmacological probes that target the myosin motor, such as omecamtiv mecarbil and mavacamten, demonstrate that contraction can be modulated directly at the sarcomere despite opposite functional outcomes.
heart contraction At A Glance
| GO ID | GO:0060047 |
|---|---|
| GO term | heart contraction |
| Ontology | biological_process |
| Synonym | cardiac contraction; heart beating; hemolymph circulation |
| Major function | Decrease heart volume in a characteristic way to propel blood through the body |
| Core mechanism | Excitation-contraction coupling involving calcium signaling and myofilament activation |
| Key molecular target | Myosin motor pocket targeted by omecamtiv mecarbil and mavacamten |
| Quantitative readout | Force-pCa curves mapped to whole-heart contraction and relaxation |
| Model organism example | Zebrafish larvae for simultaneous calcium and contraction imaging |
What Is GO:0060047?
In plain terms, heart contraction is the process by which the heart muscle squeezes and reduces its chamber volume to pump blood out to the body. The Gene Ontology describes GO:0060047 as the multicellular organismal process in which the heart decreases in volume in a characteristic way to propel blood through the body. It encompasses the coordinated events of excitation, calcium handling and myofilament shortening that together generate pump function.
Why Is heart contraction Important in Cell Biology?
Heart contraction is important because it is the direct mechanical determinant of cardiac output and blood delivery, and its dysfunction underlies major cardiovascular syndromes. Understanding the coupling between calcium handling, myofilament activation and pump performance is essential for interpreting disease phenotypes and for developing therapies that modulate contractility. Quantitative mapping of contraction and relaxation provides a bridge from molecular measurements to whole-organ physiology.
• Defines the mechanical output of the heart as a pump.
• Depends on excitation-contraction coupling and calcium physiology.
• Can be modulated pharmacologically at the myosin motor.
• Is quantifiable through force-pCa and whole-heart contraction-relaxation mapping.
• Can be imaged simultaneously with calcium signals in zebrafish larvae.
• Links cellular calcium handling to transcriptional remodeling in heart failure.
• Provides a functional readout for reverse cardiac remodeling studies.
• Serves as a target for translational approaches to excitation, contraction and transcription.
What Happens During heart contraction?
Excitation and calcium entry
In simple terms: The heart cell first gets an electrical signal that lets calcium enter.
Excitation-contraction coupling begins with electrical excitation that triggers calcium entry, a process central to cardiac contraction and altered in heart failure. Translational approaches targeting altered calcium physiology address excitation, contraction and transcription together.
Calcium release and myofilament activation
In simple terms: Calcium inside the cell switches on the contractile proteins.
Calcium signals are tightly coupled to contraction in the beating heart, as shown by simultaneous imaging of calcium and contraction in zebrafish larvae. The relationship between calcium and force can be described quantitatively by force-pCa curves mapped to whole-heart contraction and relaxation.
Myosin motor cycling and force generation
In simple terms: The myosin motor pulls the filaments to shorten the muscle.
The myosin motor pocket is a direct target of small molecules; omecamtiv mecarbil and mavacamten bind the same pocket yet have opposite effects on heart contraction. This demonstrates that force generation can be tuned at the level of the motor protein itself.
Whole-heart contraction and relaxation
In simple terms: The whole heart squeezes and then relaxes to pump blood.
Contraction and relaxation of the heart as muscle and pump are integrated processes. Quantitative mapping of force-pCa curves to whole-heart contraction and relaxation provides a framework for understanding pump performance. Isovolumic contraction velocity has been evaluated as an echocardiographic parameter in heart failure with reduced ejection fraction.
Key Genes Involved in GO:0060047 heart contraction
The following genes and proteins are central to heart contraction based on the verified literature provided.
| Gene | Major Role | Research Relevance |
|---|---|---|
| MYH7 | Myosin heavy chain motor protein | Targeted by omecamtiv mecarbil and mavacamten at the same pocket |
| MYH6 | Cardiac myosin heavy chain | Myosin motor function in contraction |
| MYBPC3 | Myosin binding protein C | Sarcomeric regulation of contraction |
| TNNT2 | Troponin T | Myofilament calcium regulation |
| TNNI3 | Troponin I | Myofilament calcium regulation |
| TNNC1 | Troponin C | Calcium binding in myofilament activation |
| ACTC1 | Actin | Thin filament component in contraction |
| NAT10 | Regulator of fatty acid beta-oxidation and contraction genes | Regulates heart development and function |
| RYR2 | Sarcoplasmic reticulum calcium release channel | Calcium release in excitation-contraction coupling |
| ATP2A2 | SERCA2 calcium pump | Calcium reuptake and relaxation |
| CACNA1C | L-type calcium channel | Calcium entry during excitation |
| NPPA | Cardiac natriuretic peptide | Cardiac remodeling and contraction studies |
| NPPB | Cardiac natriuretic peptide | Cardiac remodeling and contraction studies |
| MYL2 | Regulatory myosin light chain | Sarcomeric contraction regulation |
| MYL3 | Essential myosin light chain | Sarcomeric contraction regulation |
| TPM1 | Tropomyosin | Thin filament regulation |
| ACTN2 | Alpha-actinin-2 | Sarcomeric structural organization |
How Is heart contraction Regulated?
Heart contraction is regulated by calcium handling and myofilament sensitivity, with excitation-contraction coupling as the central control point. NAT10 maintains expression of genes related to fatty acid beta-oxidation and heart contraction, linking metabolic gene regulation to contractile function. Pharmacological modulation of the myosin pocket by omecamtiv mecarbil and mavacamten shows that contraction can be regulated directly at the motor protein. Quantitative force-pCa mapping provides a framework for describing how calcium sensitivity regulates contraction and relaxation.
heart contraction and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| MYH7 | Contractile modulation by myosin-targeting drugs | Knock-in of myosin pocket mutations |
| NAT10 | Heart development and function via contraction-related genes | Knockout in cardiac models |
| ATP2A2 | Calcium handling in heart failure | Overexpression or point mutation |
| RYR2 | Calcium release in excitation-contraction coupling | Point mutation knock-in |
| NPPA/NPPB | Cardiac remodeling and contraction | Overexpression models |
Heart failure and altered calcium physiology
Heart failure involves altered calcium physiology that affects excitation, contraction and transcription. Targeting these calcium-dependent processes is a translational approach to modifying contraction in disease. Isovolumic contraction velocity has been studied as a parameter for reverse cardiac remodeling in heart failure with reduced ejection fraction.
Myosin-targeted modulation in cardiomyopathy
Omecamtiv mecarbil and mavacamten target the same myosin pocket but have opposite effects on heart contraction, illustrating how sarcomeric modulation can be used to alter contractility. This has direct implications for understanding and potentially treating contractile dysfunction.
Developmental and metabolic regulation of contraction
NAT10 regulates heart development and function by maintaining expression of genes related to fatty acid beta-oxidation and heart contraction. This links metabolic gene regulation to contractile gene expression in the heart.
From heart contraction-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does a gene regulate heart contraction? | Knockout model |
| Does a specific amino acid change alter contractile function? | Point mutation knock-in |
| Can a reporter track contraction-related gene expression? | Tagged knock-in |
| Does increased gene dosage affect contraction? | Overexpression model |
| Can calcium and contraction be imaged simultaneously? | Zebrafish larvae imaging model |
| Can force-pCa relationships be mapped to whole-heart function? | Quantitative whole-heart contraction-relaxation model |
How to Study the heart contraction Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Calcium and contraction imaging | Simultaneous calcium signals and contraction | Zebrafish larvae beating heart |
| Force-pCa mapping | Force-calcium relationship | Whole-heart contraction and relaxation |
| Echocardiography | Isovolumic contraction velocity | Heart failure with reduced ejection fraction |
| Myosin-targeted pharmacology | Effects of myosin pocket modulation | Contraction studies with omecamtiv mecarbil and mavacamten |
| Excitation-contraction coupling assays | Calcium handling and contractile activation | Heart failure research |
| Gene expression analysis | Contraction-related gene expression | NAT10 regulation studies |
| Translational calcium physiology approaches | Excitation, contraction and transcription | Targeting altered calcium physiology |
Calcium and contraction imaging
Simultaneous imaging of calcium and contraction in the beating heart of zebrafish larvae allows direct observation of excitation-contraction coupling in vivo.
Force-pCa and whole-heart mapping
Quantitative mapping of force-pCa curves to whole-heart contraction and relaxation provides a rigorous framework for comparing contractile performance across conditions.
Echocardiographic assessment
Echocardiographic parameters such as isovolumic contraction velocity can be used to assess reverse cardiac remodeling in heart failure with reduced ejection fraction.
Pharmacological modulation of myosin
Small molecules targeting the myosin pocket, such as omecamtiv mecarbil and mavacamten, can be used to probe the direct effects of motor modulation on contraction.
How CRISPR Can Be Used to Study GO:0060047 heart contraction
Knockout
CRISPR knockout can be used to test whether a candidate gene is required for heart contraction, for example by disrupting genes such as NAT10 that regulate contraction-related gene expression.
Point Mutation
Point mutation knock-in can model specific amino acid changes in sarcomeric or calcium-handling proteins to test their effects on contraction, informed by structural knowledge of the myosin pocket targeted by omecamtiv mecarbil and mavacamten.
Knock-in
Knock-in of reporters or tags can be used to track the expression and localization of contraction-related proteins in cardiac models, complementing quantitative contraction assays.
Overexpression
Overexpression models can test whether increased dosage of a contraction-related gene alters contractile function, as suggested by studies of calcium-handling proteins in heart failure.
How EDITGENE Supports heart contraction Research
Researchers studying heart contraction-related genes often need to determine whether a candidate gene is causally involved in contractile function, and CRISPR-based models provide a direct way to test this. By combining knockout, point mutation, knock-in and overexpression strategies with functional readouts such as calcium imaging and force-pCa mapping, it is possible to link specific genes to contraction phenotypes.
Contact EDITGENE today to design your custom CRISPR model for heart contraction research.
Frequently Asked Questions About heart contraction
What is heart contraction GO:0060047?
GO:0060047 is the biological process in which the heart decreases in volume in a characteristic way to propel blood through the body.
What genes are involved in heart contraction?
Genes involved include MYH7, MYH6, MYBPC3, TNNT2, TNNI3, TNNC1, ACTC1, RYR2, ATP2A2 and CACNA1C, among others.
How is heart contraction regulated?
It is regulated by excitation-contraction coupling and calcium handling, and can be modulated at the myosin motor by drugs such as omecamtiv mecarbil and mavacamten.
What is excitation-contraction coupling in the heart?
It is the process linking electrical excitation to calcium signaling and myofilament activation that produces contraction.
How can heart contraction be measured?
It can be measured by simultaneous calcium and contraction imaging, force-pCa mapping, and echocardiographic parameters such as isovolumic contraction velocity.
What is the role of calcium in heart contraction?
Calcium entry and release activate the myofilaments, and altered calcium physiology is linked to heart failure.
Which drugs target heart contraction?
Omecamtiv mecarbil and mavacamten target the same myosin pocket but have opposite effects on contraction.
What model organisms are used to study heart contraction?
Zebrafish larvae are used for simultaneous imaging of calcium and contraction in the beating heart.
How does NAT10 affect heart contraction?
NAT10 regulates heart development and function by maintaining expression of genes related to fatty acid beta-oxidation and heart contraction.
Why is heart contraction important in disease?
Dysfunction of contraction and calcium handling underlies heart failure and cardiac remodeling.
Conclusion
GO:0060047 heart contraction is a central biological process that integrates excitation, calcium signaling and myofilament mechanics to produce pump function. Quantitative and imaging approaches, together with pharmacological and genetic models, continue to clarify how contraction is regulated and how it fails in disease. CRISPR-based models offer a direct route to test the causal roles of specific genes in heart contraction.
References
- 1. Shi L et al.. 2026. NAT10 regulates heart development and function by maintaining the expression of genes related to fatty acid β-oxidation and heart contraction.. Cell Death Differ 33(2):358-373 PMID: 40946112
- 2. Lakatta EG. 1991. Excitation-contraction coupling in heart failure.. Hosp Pract (Off Ed) 26(7):85-8, 91-8 PMID: 1677009
- 3. Brutsaert DL et al.. 1979. Contraction and relaxation of the heart as muscle and pump.. Int Rev Physiol 18:1-31 PMID: 361602
- 4. Auguin D et al.. 2024. Omecamtiv mecarbil and Mavacamten target the same myosin pocket despite opposite effects in heart contraction.. Nat Commun 15(1):4885 PMID: 38849353
- 5. Oliveros E et al.. 2024. Finding New Echocardiographic Parameters for Reverse Cardiac Remodeling: Isovolumic Contraction Velocity in Heart Failure with Reduced Ejection Fraction and Effect of Sacubitril/Valsartan: the PROVE-HF Study.. J Card Fail 30(5):666-668 PMID: 38160996
- 6. Salgado-Almario J et al.. 2022. Simultaneous imaging of calcium and contraction in the beating heart of zebrafish larvae.. Theranostics 12(3):1012-1029 PMID: 35154472
- 7. Seidler T et al.. 2007. Targeting altered calcium physiology in the heart: translational approaches to excitation, contraction, and transcription.. Physiology (Bethesda) 22:328-34 PMID: 17928546
- 8. Longobardi S et al.. 2022. Quantitative mapping of force-pCa curves to whole-heart contraction and relaxation.. J Physiol 600(15):3497-3516 PMID: 35737959
