The NDUFS6 gene helps your cells make energy in mitochondria, the parts of cells that act like power plants, and when it does not work properly, the brain, muscles, and heart may not get the steady energy they need. This gene plays an important role in the first step of that process. Severe variants in the NDUFS6 gene can cause mitochondrial complex I deficiency, which may lead to low muscle tone, feeding problems, developmental delay, seizures, breathing trouble, or heart problems, often starting in infancy.
What is a gene?
Genes are sections of DNA that give cells instructions for making molecules or managing activities in the body. Some genes provide the directions for producing proteins, which are the parts of cells that do much of the work. Others are mainly involved in controlling when, where, and how much certain activities take place. Taken together, genes affect how the body grows and works, and they can influence how you respond to food, stress, or medicines. To go deeper into this topic, you can find more in the LearnHub.
Overview
NDUFS6Gene function
What if the gene works
The NDUFS6 gene helps build complex I, part of the mitochondria that make most of your cells’ energy. This supports steady energy production, especially in organs with high energy needs such as the brain, muscles, and heart.
Risk
What if the gene does not work
Variants in the NDUFS6 gene can cause mitochondrial complex I deficiency, often presenting as Leigh syndrome. Effects include low muscle tone, feeding and breathing problems, developmental delay, and heart disease; milder and more severe variants can alter timing and severity.
Treatment
What does that mean for your treatment
No treatment or management approach specific to the NDUFS6 gene is currently established. Research is exploring ways to improve the cell’s energy making system linked to the NDUFS6 gene, but no gene-directed therapy is in routine use.
Conditions associated with NDUFS6
Gene function
What if the gene works
Your cells need a steady energy supply for routine tasks like muscle movement, nerve signaling, and organ function. The NDUFS6 gene supports this work inside mitochondria, the parts of cells that make most of your energy. Understanding NDUFS6 gene function helps explain how cells keep daily energy production running.
Inside mitochondria, the NDUFS6 gene helps complex I pass electrons from food derived fuel into the cell’s energy chain. This supports the steps that let cells turn stored fuel into usable energy.
One of the roles of the NDUFS6 gene is to help complex I form correctly and remain stable. When this energy making complex is built properly, your cells can carry out routine energy production more smoothly.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and are part of normal human variation, including differences in appearance, metabolism, and the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply reflect natural genetic diversity. Sometimes, 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
NDUFS6 gene variants often make the protein unstable or stop it from joining mitochondrial complex I, so the cell’s energy system works less efficiently. Some changes leave partial activity, while more severe variants can leave little or no working protein. That functional range is linked to complex I deficiency, with milder or later symptoms in some people and earlier, more marked disease in others.
How variants are linked to conditions
Pathogenic variants in both copies of the NDUFS6 gene cause mitochondrial complex I deficiency, a rare inherited condition that often appears as Leigh syndrome or a Leigh-like condition. In medical genetics, NDUFS6 gene variants linked to Leigh syndrome are the main confirmed association. Symptoms usually start in infancy or early childhood, and the course can vary between children.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of being human and are widely seen in the general population. Most do not have a direct effect on health and instead reflect natural human diversity. For many genes, carrying a variant connected with a condition suggests a possible association rather than a definite diagnosis, especially when several genes and environmental factors contribute. In some cases, however, 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?
There is not yet broadly confirmed evidence on specific lifestyle or environmental factors that change risk related to NDUFS6. For conditions linked to NDUFS6, risk is mainly shaped by whether someone inherits disease-causing changes in both copies of the gene; anyone concerned about personal or family risk should speak with a doctor or genetic counselor.
Inheritance of NDUFS6 variants
NDUFS6-related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one changed copy of the NDUFS6 gene from each parent, and the parents are often healthy carriers. When both parents carry an NDUFS6 variant, each pregnancy has a 25% chance of a child with the condition, a 50% chance of a child who is a carrier, and a 25% chance of a child with two usual copies. This NDUFS6 inheritance pattern affects sons and daughters equally.
What does my NDUFS6 result mean for my family?
For families with an NDUFS6-related condition, the pattern is typically recessive, which means parents are often healthy carriers and brothers or sisters may also be carriers or, less often, also be affected. Close relatives may want to learn whether the same gene change runs in the family, especially when there is a history of similar symptoms in childhood. The exact meaning for relatives depends on the specific test result found in your family.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant, genetic testing for NDUFS6 variants usually analyzes DNA from a blood sample or cheek swab. A lab reads the NDUFS6 gene and checks for changes that may help explain symptoms or confirm an inherited condition in a family. Results may show a clearly relevant variant, a variant with uncertain meaning, or no significant change found.
When should I consider getting a genetic test?
Consider NDUFS6 genetic testing when a child or adult has signs of a rare inherited condition that affects how cells make energy, especially with developmental delay, weak muscles, movement problems, or seizures. Testing can also help when there is a family history of a known NDUFS6 change or an affected relative.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it reveals varies depending on the condition and the kind of variant involved. Many factors, including lifestyle, environment, age, and medical history, influence how the body works over time. For some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is most helpful when considered alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas like medication response, genetic results can also help put individual 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 works, or how sensitive you are to side effects. This helps explain why the same treatment may work well for one person, seem weaker for another, or cause more unwanted effects in someone else.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes can affect the way a person responds to medication. It looks at links between genes and drugs to better explain why the same treatment may work differently from one person to another. For many medicines, genes can influence how strongly a drug works or how the body handles it. This information can support more informed, more individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the NDUFS6 gene
When should I seek medical advice?
There is not yet a widely confirmed link between this gene and how people respond to medicines. If you have questions about side effects, starting a new medication, or your overall health, it is best to discuss them with your doctor or pharmacist.
History
NDUFS6 entered the medical literature through research on mitochondrial disease and the large enzyme known as complex I. Initially understood only through visible traits, later recognized as tied to a specific gene, it became one of several nuclear genes linked to inherited complex I deficiency. Building on this early work, scientists connected NDUFS6 variants with a Leigh syndrome pattern in some affected children, which helped refine genetic diagnosis. Its history is mainly part of the broader effort to map the many genes involved in mitochondrial energy conditions, rather than a single high profile public story.