The TSFM gene helps mitochondria, the cell’s energy centers, make the proteins needed to produce energy. If this gene does not work properly, cells may struggle to meet energy demands, especially in the brain, muscles, liver, and heart. People with pathogenic variants in the TSFM gene can develop a mitochondrial condition with symptoms such as low muscle tone, weakness, feeding problems, developmental delay, or liver and heart involvement. Many variants are harmless, while a few may disrupt how this energy-making system works.
What is a gene?
Genes are segments of DNA that give cells instructions for making molecules or for regulating processes in the body. Some genes provide the directions for building proteins, the parts of cells that do much of the work. Other genes mainly determine when certain processes take place, where they occur, and how strongly they operate. Together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, or medications. To go deeper into this topic, you can find more in the LearnHub.
Overview
TSFMGene function
What if the gene works
The TSFM gene helps mitochondria, the cell’s energy centers, make the proteins they need. This supports normal energy production, especially in tissues with high energy demands like the brain, heart, and muscles.
Risk
What if the gene does not work
Variants in the TSFM gene can impair mitochondrial energy production, often causing low muscle tone, feeding or breathing problems, developmental delay, and heart problems. Milder or more severe variants can affect when symptoms start and which organs are involved.
Treatment
What does that mean for your treatment
No treatment or drug selection approach is currently established specifically for pathogenic variants in the TSFM gene. Care is guided by symptoms rather than by a TSFM targeted therapy. The TSFM gene is being studied within broader mitochondrial disease research, but no gene directed treatment is part of current clinical guidelines.
Conditions associated with TSFM
Gene function
What if the gene works
Your mitochondria need the TSFM gene to keep making a small group of proteins that help power the cell. Its job is to support protein-building steps inside these energy-making structures. When this process runs smoothly, cells can maintain steady day-to-day energy production.
Inside mitochondria, the TSFM gene helps your cells make proteins needed for energy production. These are part of the cell’s internal energy system and are built on the mitochondria’s own protein-making machinery.
Its protein refreshes another protein-building helper after each step. This lets that helper keep delivering amino acids, the small building blocks of proteins, to the growing chain.
By keeping mitochondrial protein production moving, the TSFM gene supports the respiratory chain, the system that turns food and oxygen into usable energy. This helps many cells meet routine energy demands.
What is a variant?
Genetic variants are small differences in a gene’s DNA sequence. They are common and form part of normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many have no noticeable effect and simply represent natural genetic variation. In some cases, though, a variant changes how a gene works more substantially and may contribute to, or cause, a genetic condition.
Genetic variants
What if the gene does not work
TSFM gene variants can change the shape or stability of the TSFM protein, or weaken its interaction with other mitochondrial translation factors, so mitochondria make fewer proteins needed for energy production. Some TSFM gene variant effects are mild and leave partial activity, while more disruptive variants may sharply reduce or abolish function. In TSFM-related mitochondrial disease, lower remaining function often goes with earlier onset and more severe features.
How variants are linked to conditions
Pathogenic variants in both copies of the TSFM gene cause combined oxidative phosphorylation deficiency 3, a rare inherited mitochondrial condition. In TSFM gene related mitochondrial disease, people may have symptoms that begin in infancy or later in life, often involving muscle weakness, developmental delay, balance problems, heart involvement, or liver problems. Severity can vary widely, even within the same family.
A variant is not necessarily a diagnosis
Gene variants are a normal part of human biology and are widely found in the general population. Most do not directly affect health and instead reflect natural human diversity. For many genes, having a variant associated with a condition points to a possible link rather than a firm diagnosis, especially when several genes and environmental factors play a role. In some situations, though, a single well characterized variant in a specific gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For TSFM-related conditions, risk is mainly shaped by inheritance rather than lifestyle. A child’s risk is higher when both biological parents carry a harmful TSFM change; there is not enough evidence to say that diet, exercise, or other everyday habits lower the chance of developing the condition.
Inheritance of TSFM variants
TSFM-related conditions are inherited in an autosomal recessive pattern. This means a child usually needs to inherit two disease-causing variants in the TSFM gene, one from each parent, to be affected. Parents who each carry one variant are often unaffected themselves. For families asking how TSFM gene variants are inherited, each pregnancy between two carriers has a 25% chance of an affected child, a 50% chance of a child who is a carrier, and a 25% chance of a child who inherits neither variant.
What does my TSFM result mean for my family?
TSFM-related conditions are usually passed down in a recessive pattern, so close relatives may also be carriers even if they have no symptoms. Brothers and sisters of an affected child may also be affected or be carriers. Parents are usually healthy carriers, and other family members may want to learn whether the same gene change runs in the family.
Genetic information
Genetic testing
How you find out about variants
TSFM genetic testing usually uses a blood or saliva sample. A lab reads the TSFM gene to look for variants, often through a mitochondrial disease panel, whole exome sequencing, or whole genome sequencing. Results can help confirm a TSFM-related diagnosis or clarify a variant found in the family.
When should I consider getting a genetic test?
Testing for changes in the TSFM gene may be considered when a baby or child has signs of a mitochondrial condition, such as severe feeding problems, low muscle tone, developmental delay, or heart muscle disease. It can also help when there is a family history of this kind of inherited energy-production condition.
A genetic result is only one part of your health story
A genetic result can be informative, but how much it reveals varies by the condition and the type of variant involved. Lifestyle, environment, age, and medical history are among the many factors that influence how the body functions over time. In some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is most useful when viewed alongside 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 individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body responds to certain medicines. Some people process a drug more quickly, while others process it more slowly, which can change how well the treatment works or how sensitive they are to side effects. These differences are common and help explain why the same medication can have different effects from one person to another. Genetics is only one part of the picture, alongside factors like age, overall health, and other medicines.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes affect the way people respond to medicines. By studying links between drugs and genes, it helps explain why the same treatment can work differently from one person to another. For many medications, genes influence both how strongly a drug acts and how the body processes it. This information can support more informed, individualized treatment decisions. More detailed information on this topic is available in the LearnHub.
Drugs influenced by the TSFM gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or response. Questions about side effects, new symptoms, or how medicines may affect your health are best discussed with your doctor.