The NDUFAF1 gene helps your cells build complex I, a key part of the energy system inside mitochondria, the cell’s energy centers. If this gene does not work properly, cells may not make enough energy for organs that need a lot of it, especially the brain, muscles, heart, and liver. Pathogenic variants in the NDUFAF1 gene can cause mitochondrial complex I deficiency. Depending on the variant, a person may have low muscle tone, developmental delay, feeding problems, seizures, or heart and liver involvement.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or manage processes throughout the body. Some genes provide the directions for producing proteins, which are the parts of cells that do much of the work. Others mainly guide when certain processes happen, where they happen, and how active they are. Taken together, genes affect how the body grows and works, and they can influence how you react to food, stress, or medications. For a more detailed look at this topic, you can find more in the LearnHub.
Overview
NDUFAF1Gene function
What if the gene works
The NDUFAF1 gene helps build complex I, part of the cell's energy-making machinery in mitochondria. This supports normal energy production, especially in tissues with high energy needs.
Risk
What if the gene does not work
Variants in the NDUFAF1 gene can cause mitochondrial disease, often beginning in infancy or childhood with low muscle tone, developmental delay, and Leigh syndrome. Effects may range from milder to more severe, depending on how much gene function remains.
Treatment
What does that mean for your treatment
No NDUFAF1-specific treatment or drug selection approach is currently established in clinical guidelines. Care for people with pathogenic variants in the NDUFAF1 gene is based on their symptoms and the organs involved, rather than on a gene targeted medicine.
Conditions associated with NDUFAF1
Gene function
What if the gene works
Your cells need a steady way to turn food into usable energy. The NDUFAF1 gene helps build a key part of the system inside mitochondria, the structures that supply most of a cell's power. Understanding how the NDUFAF1 gene helps mitochondria make energy gives useful context for its role in daily cell function.
The NDUFAF1 gene helps your cells assemble complex I, a major part of the energy chain in mitochondria. It guides early building steps so the full structure can form in an orderly way.
Once complex I is built, mitochondria can pass electrons along the energy chain more smoothly. This helps cells capture energy from food and turn it into ATP, the main fuel your body uses.
Inside mitochondria, NDUFAF1 works as an assembly helper rather than a permanent part of the finished complex. It helps partly built pieces stay stable long enough to join together correctly.
What is a variant?
Within a gene, a genetic variant is a small change in the DNA sequence. These changes are common and are part of 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 simply represent natural genetic variation. Sometimes, though, a variant can change how a gene functions more substantially and may contribute to or lead to a genetic condition.
Genetic variants
What if the gene does not work
NDUFAF1 gene variants can reduce or disrupt the assembly helper needed to build complex I, a key part of the cell’s energy machinery. Some changes make the protein unstable or less able to interact with partner proteins, while more disruptive variants may leave little or no working protein. This often leads to weaker complex I assembly and lower energy production. Milder variants may leave some function, which can contribute to later or less severe mitochondrial disease.
How variants are linked to conditions
Pathogenic variants in the NDUFAF1 gene cause mitochondrial complex I deficiency, a rare inherited condition. In published reports, variants in the NDUFAF1 gene have been linked to symptoms that often begin in infancy or childhood, including low muscle tone, developmental delay, seizures, feeding problems, or breathing difficulties. Finding disease causing variants in both copies of the gene can confirm the diagnosis.
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 simply reflect natural differences between people. For many genes, a variant associated with a condition points to a possible link rather than a certain diagnosis, particularly when several genes and environmental influences play a role. In some situations, though, one well-understood variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For NDUFAF1, risk is mostly linked to inheritance rather than lifestyle. A child is more likely to be affected if both biological parents carry a harmful change in this gene, and this can be more common when there is family history or when parents are related by blood.
Inheritance of NDUFAF1 variants
NDUFAF1-related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one altered copy of the NDUFAF1 gene from each parent, and the parents are typically healthy carriers. When both parents carry a variant, each pregnancy has a 25% chance of the child inheriting both altered copies, a 50% chance of being a carrier, and a 25% chance of inheriting neither altered copy. In families asking how NDUFAF1 variants are inherited, this pattern means boys and girls are affected equally.
What does my NDUFAF1 result mean for my family?
For families with a disease-causing NDUFAF1 result, the pattern is usually recessive, which means parents are often healthy carriers and brothers or sisters could also be affected or be carriers. Close relatives may want to learn whether the same result runs in the family, especially if there is a history of similar symptoms in childhood. The family meaning depends on whether the result is clearly disease-causing or simply a change of uncertain importance.
Genetic information
Genetic testing
How you find out about variants
NDUFAF1 genetic testing uses a blood or saliva sample to look for variants in the NDUFAF1 gene, often through a mitochondrial disease panel or exome sequencing. The lab reads the DNA sequence and compares it with a reference to find changes. Results may identify a variant linked to disease or a change with unclear meaning.
When should I consider getting a genetic test?
Genetic testing for the NDUFAF1 gene may be considered when a baby or child has signs of a condition that affects how the body makes energy, such as poor growth, weak muscles, developmental delay, seizures, or heart problems. It can also be helpful after similar unexplained illness in a close family member.
A genetic result is only one part of your health story
A genetic result may provide useful insight, although how much it can explain depends on the condition and the specific type of variant. How the body functions over time is shaped by many factors, including lifestyle, environment, age, and medical history. In some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best understood alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas like medication response, genetic results may help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small DNA differences can change how the body breaks down a drug, moves it through the body, or responds to it at its target. This helps explain why the same medication may work well for one person, do less for another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes affect the way people respond to medications. By looking at links between genes and drugs, it helps explain why the same treatment may work differently in different people. For many medicines, genes influence how the body handles a drug and how strong its effects are. This information can support treatment choices that are more informed and more personalized. More detail on this topic is available in the LearnHub.
Drugs influenced by the NDUFAF1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response, so questions about side effects, treatment choices, or how well a medicine is working are best discussed with your doctor.