The NDUFAF5 gene helps your cells assemble complex I, an important part of mitochondria, the structures that make energy. If this gene does not work properly, cells may struggle to produce enough energy, especially in the brain and muscles. This gene plays an important role in early growth and movement, so some harmful variants can be linked to a mitochondrial condition with developmental delay, low muscle tone, movement problems, seizures, or heart involvement.
What is a gene?
Genes are sections of DNA that give your cells instructions for making molecules or directing activities in the body. Some genes carry the code for proteins, the parts of cells that do much of the work. Others mainly regulate when certain processes happen, where they take place, and how active they are. Together, genes affect how the body develops and works, and they can also shape how you respond to food, stress, or medications. For a more detailed look at this topic, you can find more in the LearnHub.
Overview
NDUFAF5Gene function
What if the gene works
The NDUFAF5 gene helps your cells build complex I, a part of mitochondria (the cell’s power centers) that helps make energy. This supports steady energy production, especially in tissues with high energy needs such as the brain and muscles.
Risk
What if the gene does not work
Variants in the NDUFAF5 gene can disrupt cell energy production and cause mitochondrial disease, often affecting the brain and muscles. Effects may range from milder movement or learning problems to earlier, more severe developmental delay, weakness, seizures, or Leigh syndrome.
Treatment
What does that mean for your treatment
For pathogenic variants in the NDUFAF5 gene, no treatment or drug selection approach specific to this gene is currently established. Research on the NDUFAF5 gene mainly looks at how it contributes to complex I deficiency, rather than as a direct drug target.
Conditions associated with NDUFAF5
Gene function
What if the gene works
Your cells need the NDUFAF5 gene to help build one of the mitochondria’s main energy making machines. Mitochondria are the parts of cells that turn food and oxygen into usable energy. This gene supports an early step in how mitochondrial complex I is put together for everyday cell energy.
The NDUFAF5 gene helps your cells assemble complex I, a major part of the mitochondria’s energy system. It works early in the build process so protein pieces can come together in the right order.
Inside mitochondria, the NDUFAF5 gene adds a small chemical mark to one complex I protein as it is being built. This helps that protein settle into the growing structure more smoothly.
By helping complex I form properly, the NDUFAF5 gene supports the controlled movement of electrons used to make ATP, your cells’ main energy supply. This helps many tissues meet routine energy needs.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help explain normal differences among people, such as appearance, metabolism, or the way the body responds to environmental influences. Many have no noticeable effect and are simply part of natural genetic variation. In some cases, 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 NDUFAF5 gene variants make the protein unstable or less able to help assemble mitochondrial complex I, so cells are left with less working complex I and weaker energy production. This explains how NDUFAF5 gene variants affect mitochondrial complex I at a cellular level. Milder variants may leave some residual activity, while more severe variants can cause little or no function and are often linked to earlier onset and more pronounced mitochondrial disease.
How variants are linked to conditions
Pathogenic variants in both copies of the NDUFAF5 gene cause mitochondrial complex I deficiency, often diagnosed as Leigh syndrome or a related mitochondrial disease. Children with NDUFAF5 gene variants linked to Leigh syndrome often have early feeding problems, low muscle tone, developmental delay, seizures, or trouble with movement and breathing. This is a confirmed genetic diagnosis, although symptoms and day to day impact can vary.
A variant is not necessarily a diagnosis
Gene variants are a normal feature 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 definite diagnosis, especially when several genes and environmental factors are involved. In some cases, 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 NDUFAF5, risk is mainly shaped by whether a child inherits disease-causing changes in both copies of the gene from carrier parents. There is not enough evidence to say that lifestyle factors change the chance of having the condition, though infections and other physical stress can sometimes make symptoms worse in those already affected.
Inheritance of NDUFAF5 variants
NDUFAF5-related conditions are inherited in an autosomal recessive pattern. This means a child usually needs to inherit one altered copy of the NDUFAF5 gene from each parent to be affected, while parents who carry one copy are typically unaffected carriers. For families asking about NDUFAF5 gene inheritance, when both parents are carriers, each pregnancy has a 25% chance of an affected child, a 50% chance of a carrier child, and a 25% chance of a child who inherits neither altered copy. This pattern applies to the well-established disease links for this gene.
What does my NDUFAF5 result mean for my family?
Changes in the NDUFAF5 gene linked to disease are usually passed down in a recessive pattern, which means close relatives may be healthy carriers without knowing it. Brothers and sisters could also be affected or be carriers, and other family members may carry the same gene change. This can matter for future pregnancies and for relatives who want to understand their own chances of having an affected child.
Genetic information
Genetic testing
How you find out about variants
To find out about NDUFAF5 variants, genetic testing reads the NDUFAF5 gene from a blood or saliva sample. A lab usually uses a multigene panel, exome sequencing, or genome sequencing to look for changes in both gene copies. Results can show whether a disease-causing variant is present, absent, or uncertain.
When should I consider getting a genetic test?
Genetic testing for the NDUFAF5 gene may be worth considering when a child or adult has signs of an inherited condition that affects how the body makes energy, such as developmental delay, muscle weakness, seizures, or unexplained changes on brain scans. It can also help when there is a family history or a known NDUFAF5 variant in the family.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it reveals depends on the condition and the type of variant involved. Many other factors, including lifestyle, environment, age, and medical history, also shape how the body functions over time. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best understood alongside other aspects of care. In other situations, a genetic result may offer a clear answer. In areas such as 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 people respond to medicines. Small differences in DNA can change how the body breaks down a drug, moves it through the bloodstream, or responds to it at its target. This helps explain why the same medication may work well for one person, have less effect in another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics is the area of study that examines how genetic differences affect the way people respond to medications. It looks at connections between genes and drugs to help explain why the same treatment can 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 understanding can support treatment decisions that are more informed and more individualized. You can learn more about this topic in the LearnHub.
Drugs influenced by the NDUFAF5 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 medicines, side effects, or changes in how you feel are best discussed with your doctor. For NDUFAF5, research has focused on its link to rare mitochondrial conditions, not on a proven effect on how people respond to specific medicines.