The NDUFAF3 gene helps your cells build complex I, a key part of the machinery that turns food into usable energy. This gene plays an important role in keeping mitochondria, the cell’s energy centers, working properly. If it does not work well, cells may struggle to make enough energy, especially in the brain and muscles. More disruptive variants in the NDUFAF3 gene can cause a mitochondrial condition called complex I deficiency, which may lead to developmental delay, low muscle tone, movement problems, or seizures.
What is a gene?
A gene is a stretch of DNA that carries instructions cells use to make molecules or guide processes in the body. Some genes provide the directions for making proteins, which are the working parts of cells. Others mainly regulate when certain processes happen, where they take place, and how active they are. Taken together, genes affect how the body grows and works, and they can influence how you respond to food, stress, or medicines. For a more detailed look at this topic, you can find additional information in the LearnHub.
Overview
NDUFAF3Gene function
What if the gene works
The NDUFAF3 gene helps your cells build complex I in mitochondria, your cells’ energy centers. This supports turning food into usable energy, especially in tissues with high energy needs.
Risk
What if the gene does not work
When the NDUFAF3 gene does not work properly, cells struggle to build mitochondrial complex I, which can reduce energy production. Milder variants may cause less severe features, while more disruptive variants often cause early-onset mitochondrial disease, including developmental delay, Leigh syndrome, and sometimes heart problems.
Treatment
What does that mean for your treatment
No NDUFAF3-specific treatment or drug selection approach is currently established. Management for people with pathogenic variants in the NDUFAF3 gene is supportive and based on symptoms rather than a gene-based medicine. Research in mitochondrial disease is exploring ways to improve complex I function, but this has not produced a guideline-based therapy tied to NDUFAF3.
Conditions associated with NDUFAF3
Gene function
What if the gene works
Your cells need a steady way to turn food into usable energy. The NDUFAF3 gene helps set up one of the main energy making systems inside mitochondria, the parts of cells often called energy centers. Understanding what the NDUFAF3 gene does in the body helps explain how cells keep routine processes running.
The NDUFAF3 gene helps your mitochondria assemble complex I, a large protein machine that starts an important energy pathway. It acts as an assembly helper, guiding parts into place so the system is built correctly.
By helping complex I come together, its protein supports the first steps of mitochondrial energy production. This lets cells move electrons in a controlled way and make ATP, the fuel used for everyday work.
This gene works inside mitochondria, where cells process nutrients to release usable energy. In tissues that need constant power, such as the brain, muscles, and heart, that steady setup helps routine cell activity stay on track.
What is a variant?
A genetic variant is a minor difference in the DNA sequence within a gene. These differences are common and help shape normal human diversity, including differences in appearance, metabolism, and the way the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. Sometimes, though, a variant changes how a gene works more significantly and can contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the NDUFAF3 gene can weaken or disrupt the cell’s ability to assemble complex I, a part of mitochondria that helps make energy. Some changes mainly reduce the stability of the NDUFAF3 protein, while more disruptive variants may leave little or no working protein. This range helps explain how NDUFAF3 gene variants affect protein function and why mitochondrial disease may appear earlier or be more pronounced in some people.
How variants are linked to conditions
Pathogenic variants in the NDUFAF3 gene cause a rare inherited mitochondrial condition called mitochondrial complex I deficiency. In reported families, it has been linked to early life problems such as low muscle tone, feeding difficulties, developmental delay, high lactic acid levels, and sometimes heart or breathing complications. NDUFAF3 gene variants and mitochondrial disease most often fit a recessive pattern, with the condition appearing when a child inherits one pathogenic variant from each parent.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common across the general population. Most do not have a direct effect on health and simply reflect 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?
There is not yet broadly confirmed evidence on specific factors that increase or reduce risk related to the NDUFAF3 gene itself. For families with a disease-causing change in NDUFAF3, the main factor is whether a child inherits the altered gene from both parents, rather than lifestyle or everyday exposures.
Inheritance of NDUFAF3 variants
Variants in the NDUFAF3 gene are inherited in an autosomal recessive pattern, which means a child usually needs to inherit one changed copy from each parent to have an NDUFAF3-related condition. Parents who each carry one variant are typically unaffected carriers. With each pregnancy, they have a 25% chance of having an affected child, a 50% chance of having a child who is a carrier, and a 25% chance of having a child without the familial variants. In practical terms, how variants of the NDUFAF3 gene are inherited usually involves both sides of the family contributing one copy each.
What does my NDUFAF3 result mean for my family?
For families with a disease-causing change in the NDUFAF3 gene, the usual pattern is recessive, which means parents are often healthy carriers and brothers or sisters may also be carriers or, in some families, 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 early-onset mitochondrial disease. Children of someone with an NDUFAF3-related condition will usually be carriers unless the other parent also carries a disease-causing change in this gene.
Genetic information
Genetic testing
How you find out about variants
To find variants in the NDUFAF3 gene, genetic testing for NDUFAF3 variants usually analyzes a blood sample or cheek swab. A lab reads the gene’s DNA code and compares it with a reference sequence to look for changes that may help explain a suspected mitochondrial condition. Results may show a pathogenic variant, a benign variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
Testing for the NDUFAF3 gene may be worth considering when a baby or child has signs of a rare condition that affects how cells make energy, such as severe muscle weakness, feeding problems, developmental delay, or repeated high lactic acid levels. It can also help if there is a family history of this condition or an affected sibling.
A genetic result is only one part of your health story
A genetic result can be helpful, but how much it explains depends on the condition and on the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, also affect how the body works over time. In some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is best understood together with other parts of care. In other situations, a genetic result can give a clear answer. In areas such as 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 people respond to medicines. Small differences in DNA can change how the body breaks down a drug, moves it through the body, or responds to its effects at the target tissue. This is common and helps explain why the same treatment works well for one person, has less effect in another, or causes more side effects in someone else.
What is Pharmacogenetics?
Pharmacogenetics is the study of how differences in genes affect responses to medications. It examines relationships between genes and drugs to better understand why the same treatment may work differently from one person to another. For many medicines, genes can influence how strongly a drug works and how the body processes it. This information can help support more informed and individualized treatment decisions. You can learn more about this topic in the LearnHub.
Drugs influenced by the NDUFAF3 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen or adjusted. If you have concerns about side effects, how well a medicine is working, or new symptoms after starting treatment, talk with your doctor.