The MYH6 gene gives heart muscle cells instructions for a protein that helps the heart’s upper chambers squeeze and supports a steady heartbeat. This gene plays an important role in how the heart contracts from one beat to the next. When a harmful variant disrupts this job, some people can develop heart rhythm changes, weakening of the heart muscle, or a hole between the upper chambers that is present from birth. Effects can vary widely, from few symptoms to a need for ongoing heart care.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate activities in the body. Some genes provide the directions for producing proteins, which do much of the cell’s work. Others mainly control when certain processes happen, where they occur, and how active they are. Together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, and medications. For a closer look at this topic, you can learn more in the LearnHub.
Overview
MYH6Gene function
What if the gene works
The MYH6 gene helps make a motor protein in heart muscle cells, mainly in the heart’s upper chambers. This protein helps the heart contract and relax in a coordinated way with each beat.
Risk
What if the gene does not work
Variants in the MYH6 gene are linked to atrial septal defects and can also contribute to heart rhythm problems or cardiomyopathy. Milder and more severe variants may affect when features appear and how marked they are.
Treatment
What does that mean for your treatment
No treatment or medication choice is currently tailored specifically to pathogenic variants in the MYH6 gene. Care is guided by the heart problem itself, such as rhythm management, standard heart failure medicines, or repair of a structural heart change when needed.
Conditions associated with MYH6
Gene function
What if the gene works
Each heartbeat depends on tiny muscle fibers sliding past one another in a controlled way. The MYH6 gene gives heart cells instructions for making one of the main motor proteins that powers this movement, especially in the upper chambers of the heart. This is a central part of how the MYH6 gene helps the heart beat with a steady, efficient squeeze.
The MYH6 gene helps make a motor protein that lets heart muscle cells shorten and pull. Working together across many cells, this creates the squeezing motion that moves blood forward.
Its protein uses ATP, the cell's fuel, to create movement inside heart muscle fibers. This turns chemical energy into the mechanical force needed for each beat.
The MYH6 protein sits in the organized fibers that give heart muscle its pull. This arrangement helps many cells contract in a coordinated way, especially in the atria, the heart's upper chambers.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These differences are common and help create normal human diversity, such as differences in appearance, metabolism, or how the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some cases, though, a variant can change how a gene functions more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the MYH6 gene can alter the heart muscle protein’s shape, stability, or ability to generate force and join the muscle machinery inside heart cells. In MYH6 gene variants, milder changes may partly reduce protein function, while more severe variants can produce a shortened protein or little to no working protein. This range can influence how strongly heart-related features appear and, in some cases, when they begin.
How variants are linked to conditions
Pathogenic variants in the MYH6 gene can cause some inherited heart conditions, most clearly atrial septal defect and certain forms of a heart rhythm condition called sick sinus syndrome. In families with MYH6 gene variants and heart conditions, doctors may also see cardiomyopathy or atrial fibrillation. These findings vary by the specific variant, and not every MYH6 change carries the same health meaning.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a normal feature of human biology. Most do not directly affect health and instead reflect natural variation among people. For many genes, having a variant associated with a condition suggests a possible link rather than a confirmed diagnosis, particularly when more than one gene and environmental influences play a part. In some situations, though, one well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that increase or reduce risk related to the MYH6 gene. Because MYH6 changes can be linked to different heart conditions in different families, personal risk is usually shaped most by the exact gene change and family history, and a doctor or genetic counselor can help explain what that means for you.
Inheritance of MYH6 variants
The inheritance pattern for MYH6-related conditions can differ depending on the specific heart condition and the variant involved. Many well-established MYH6 gene conditions follow an autosomal dominant pattern, which means a parent carrying a pathogenic MYH6 gene variant can pass it to a child with a 50% chance in each pregnancy. Some MYH6 gene variants have also been linked to autosomal recessive inheritance, where a child needs to inherit one altered copy from each parent. The MYH6 gene is on chromosome 14, so children of any sex can inherit it from either parent.
What does my MYH6 result mean for my family?
For MYH6, family meaning usually follows a dominant pattern for the heart conditions linked to this gene, so close relatives such as parents, brothers, sisters, and children may also carry the same gene change. In many families, each child of someone with a disease-causing MYH6 variant has a 1 in 2 chance of inheriting it. Because MYH6 can be linked to more than one heart condition, what it means for relatives can depend on the exact result.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for MYH6 variants usually uses a blood or saliva sample to read the MYH6 gene and look for changes linked to inherited heart conditions. Results may show a variant known to be linked to disease, a benign variant, or a variant of uncertain significance, which means the finding is not yet fully understood.
When should I consider getting a genetic test?
Genetic testing for the MYH6 gene may be considered if you or close relatives have unexplained thickening or weakening of the heart muscle, certain ongoing heart rhythm problems, or a heart condition present from birth. It can also help when these problems or sudden unexplained death run in a family.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it explains varies by the condition and the type of variant involved. Many factors, including age, medical history, lifestyle, and environment, shape how the body functions over time. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best considered alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas like medication response, these results can help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Two people can take the same treatment and have different results because their bodies may absorb, break down, transport, or respond to a drug in different ways. This is a common part of normal human variation, and it can influence how well a medicine works or how sensitive someone is to side effects.
What is Pharmacogenetics?
Pharmacogenetics looks at how differences in genes can shape a person’s response to medication. It examines gene and drug patterns to better understand why the same treatment may work differently from one person to another. For many medicines, genes can affect how strongly a drug works or how the body processes it. This information can help support treatment decisions that are both more informed and more individualized. You can read more about this topic in the LearnHub.
Drugs influenced by the MYH6 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response. Questions about side effects, new symptoms, or whether a treatment is right for you are best discussed with your doctor.