The ANO5 gene helps muscle cells keep their outer membrane stable and may also support normal bone growth. When this gene does not work properly, some people develop muscle weakness, muscle pain, cramping, or very high creatine kinase levels, often starting in adulthood. Certain ANO5 variants are also linked to a rare bone condition that can affect the jaw and long bones. Effects vary widely, so some people notice few symptoms while others need ongoing medical 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 hold the information needed to produce proteins, the parts of cells that carry out much of the work. Other genes mainly direct when certain processes happen, where they happen, and how strongly they run. Together, genes influence how the body develops and functions, and they can shape how you respond to food, stress, or medications. For a more detailed look at this topic, you can learn more in LearnHub.
Overview
ANO5Gene function
What if the gene works
The ANO5 gene helps muscle cells repair their surface membrane after everyday wear. It also supports normal bone cell function.
Risk
What if the gene does not work
More disruptive variants in the ANO5 gene often cause muscle disease, with weakness in the hips, shoulders, or legs that can range from mild to more limiting. Other variants can cause a bone condition affecting the jaw and long bones.
Treatment
What does that mean for your treatment
For pathogenic variants in the ANO5 gene, no ANO5-specific treatment or drug-selection approach is currently established. Care follows standard treatment for the related muscle or bone condition rather than a therapy chosen because of the ANO5 gene, and ANO5-targeted treatments remain in early research.
Conditions associated with ANO5
Gene function
What if the gene works
In your muscles and some other tissues, the ANO5 gene helps cells keep their membranes in good working order. It is especially important in skeletal muscle, where long cells are stretched during everyday movement. Its protein works in cell membranes to support repair and normal upkeep.
The ANO5 gene helps muscle cells seal small membrane tears that happen with normal movement and exercise. This cell membrane repair in muscle cells helps large muscle fibers stay intact during daily use.
Its protein can move certain membrane fats from one side of the membrane to the other. This helps the membrane change shape in a controlled way when cells need to seal, reshape, or renew their surface.
Inside muscle cells, the ANO5 gene supports routine membrane maintenance and the joining of repair material to the cell surface. This helps muscles handle repeated stretch and minor wear as part of normal activity.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These changes are common and are part of normal human diversity, such as differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply reflect natural genetic variation. Sometimes, though, a variant can change how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Many ANO5 gene variants change how the cell makes or handles the ANO5 protein, often leaving less working protein at the cell membrane. Some are milder and only partly reduce protein stability or activity, while more severe variants can stop protein production altogether. This range helps explain how ANO5 gene variants affect protein function and why associated muscle symptoms may vary in age of onset and severity. Certain missense variants may also alter the protein in a different way rather than simply reducing it.
How variants are linked to conditions
Pathogenic variants in the ANO5 gene cause ANO5 related muscle disease, most often limb-girdle muscular dystrophy R12 and Miyoshi distal myopathy 3. Some people mainly have high creatine kinase on blood tests or muscle pain and weakness with exercise, while others develop a clearer ANO5 gene muscular dystrophy pattern over time. Separate variants in the ANO5 gene can also cause gnathodiaphyseal dysplasia, a condition affecting the jaw and bone strength.
A variant is not necessarily a diagnosis
Gene variants are a usual feature of human biology and are widespread in the general population. Most do not directly affect health and simply contribute to natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a certain diagnosis, especially when several genes and environmental factors are involved. In some situations, though, a single well characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For ANO5, risk is mainly tied to the specific gene change inherited, and there is not broadly confirmed evidence that lifestyle or everyday exposures clearly increase or reduce the chance of developing an ANO5-related condition. For many living with ANO5 changes, the main differences are in how symptoms start and how severe they become, rather than clear outside risk factors.
Inheritance of ANO5 variants
ANO5 gene inheritance depends on the specific ANO5-related condition. Most ANO5-related muscle conditions follow an autosomal recessive pattern, which means a child inherits one variant from each parent, and parents are usually healthy carriers; each pregnancy then has a 25% chance of an affected child. A separate bone condition linked to the ANO5 gene, called gnathodiaphyseal dysplasia, follows an autosomal dominant pattern, so one altered copy can be enough and an affected parent can pass it to a child with a 50% chance. Because of this, ANO5 gene inheritance is not described by one single pattern for every family.
What does my ANO5 result mean for my family?
ANO5 results can mean different things for relatives, because this gene is linked to more than one inherited condition. For the muscle conditions most often tied to ANO5, close family members may be carriers or, less often, may also be affected if they inherited the same change from both parents. A different ANO5-related bone condition can run in families in a dominant way, so a parent, child, brother, or sister may also carry the change.
Genetic information
Genetic testing
How you find out about variants
If muscle symptoms or a family pattern raise concern, genetic testing for ANO5 variants usually uses a blood or saliva sample to read the ANO5 gene and look for changes linked to ANO5-related muscle conditions. Results may show a variant known to cause disease, no relevant variant, or a variant of uncertain significance, which means the finding is not yet clear.
When should I consider getting a genetic test?
Consider testing for ANO5 if there is unexplained muscle weakness, repeated blood tests showing high levels of a muscle enzyme, or a family history of ANO5-related muscle disease. Testing can also help confirm the cause when several relatives have similar symptoms.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but what it can tell you depends on the condition and the kind of variant involved. How the body works over time is also shaped by many factors, including lifestyle, environment, age, and medical history. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is most helpful when considered together with other parts of care. In other situations, a genetic result may give a clear answer. In areas like medication response, genetic results can also help put personal experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body responds to medicines. Small differences in genes can change how a drug is broken down, how strongly it acts, or how sensitive you are to side effects. This is a common reason the same medication may work well for one person, help only a little in another, or feel harder to tolerate.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes can affect a person’s response to medicines. It looks at gene drug patterns to help explain why the same treatment can work differently from one person to another. For many medications, genes can influence both how strongly a drug works and how the body handles it. This information can support treatment decisions that are better informed and more individualized. To explore this subject in more detail, you can learn more in the LearnHub.
Drugs influenced by the ANO5 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in predicting how medicines will work or which side effects someone may have, so medication questions or changes in how you feel are best discussed with your doctor. Seek prompt medical advice for severe muscle pain, worsening weakness, or dark urine after starting any new medicine.
History
Researchers first connected the ANO5 gene to human disease in the early 2010s, when variants were identified in people with a rare bone condition called gnathodiaphyseal dysplasia. Soon after, separate studies linked the same gene to inherited muscle conditions, including limb-girdle muscular dystrophy and Miyoshi distal myopathy. From these first observations, research expanded steadily. This changed how doctors classified some families whose symptoms had been recognized for years but had not yet been tied to a single gene. ANO5 was also known in research circles by the name TMEM16E before the anoctamin naming system became more widely used. Over time, descriptions became more precise, and ANO5 became an established part of neuromuscular genetics.