The NDUFS7 gene helps mitochondria, the parts of cells that make energy, run complex I, a key step in energy production. What this gene does can influence how your body powers the brain, muscles, and heart. If it does not work properly, cells may not make enough energy, which can lead to a mitochondrial condition with developmental delay, low muscle tone, movement problems, seizures, or heart involvement.
What is a gene?
Genes are stretches of DNA that give your cells instructions for making molecules or regulating processes in the body. Some genes carry the directions for producing proteins, the parts of cells that do the work. Others mainly determine when certain processes happen, where they happen, and how strongly they run. Together, genes affect how the body develops and functions, and they can also shape how you respond to food, stress, or medications. To explore this topic in greater detail, you can learn more in the LearnHub.
Overview
NDUFS7Gene function
What if the gene works
The NDUFS7 gene helps mitochondria, your cells’ energy makers, run complex I, part of the chain that turns food into ATP, the cell’s main energy source.
Risk
What if the gene does not work
Pathogenic variants in the NDUFS7 gene can cause mitochondrial disease, most often Leigh syndrome, with developmental delay or regression, low muscle tone, movement problems, and breathing difficulties. Milder or severe variants can affect when symptoms start and symptom severity.
Treatment
What does that mean for your treatment
For people with a pathogenic variant in the NDUFS7 gene, no NDUFS7-specific treatment or drug choice is currently established; care is supportive and guided by the person’s symptoms and overall mitochondrial condition.
Conditions associated with NDUFS7
Gene function
What if the gene works
Your cells need a steady supply of energy to power movement, thinking, and organ function. The NDUFS7 gene helps with one of the first steps in energy production in mitochondria, the parts of cells that make most usable energy. Its protein works as part of complex I, a large machine in the inner mitochondrial membrane.
Inside mitochondria, the NDUFS7 gene helps complex I move electrons, tiny charged particles, through the cell’s energy chain. This starts a process that lets cells capture energy from food in a controlled way.
Its protein helps pass electrons to coenzyme Q, a small carrier in the mitochondrial membrane. This keeps energy moving into the next stages of cellular respiration, the process cells use to make ATP.
As complex I works, it helps build a charge difference across the inner mitochondrial membrane. Your cells use this stored energy to make ATP, the main fuel they use for everyday tasks.
What is a variant?
A genetic variant is a slight change in the DNA sequence within a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some situations, though, a variant can change how a gene functions more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the NDUFS7 gene can change the NDUFS7 protein so it folds poorly, is less stable, or cannot fit properly into complex I, a key part of mitochondria, the structures that make energy in cells. Some NDUFS7 gene variants are milder and leave partial activity, while more severe variants can greatly reduce or stop complex I function. That difference often shapes how early mitochondrial disease appears and how severe it becomes.
How variants are linked to conditions
Pathogenic variants in the NDUFS7 gene cause mitochondrial complex I deficiency, most often seen as Leigh syndrome, usually beginning in infancy or early childhood. In medical genetics, NDUFS7 gene variants causing Leigh syndrome are the main established finding. A confirmed pathogenic variant in the NDUFS7 gene can support or confirm the diagnosis alongside the person's symptoms and other test results.
A variant is not necessarily a diagnosis
Variants in genes are a routine part of being human and are widespread across the population. Most do not directly affect health and instead reflect normal human variation. For many genes, having a variant associated with a condition points to a possible link, not a certain diagnosis, particularly when several genes and environmental influences contribute. In some situations, though, one well-characterized variant in a particular gene is enough to confirm the 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 health risk related to the NDUFS7 gene. People with questions about their personal or family risk can speak with a doctor or genetic counselor.
Inheritance of NDUFS7 variants
NDUFS7-related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one NDUFS7 variant from each parent, and the parents are typically healthy carriers. For families asking how NDUFS7 variants are inherited, when both parents carry a variant in the NDUFS7 gene, each pregnancy has a 25% chance of the child having the condition, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. Because the NDUFS7 gene is on chromosome 19, this pattern is the same for boys and girls.
What does my NDUFS7 result mean for my family?
For NDUFS7, family impact is usually discussed in a recessive pattern. This often means parents of an affected child are healthy carriers, and brothers or sisters may also be affected or may be carriers. More distant relatives, such as aunts, uncles, and cousins, can sometimes carry the same gene change too, especially on the same side of the family.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for variants in the NDUFS7 gene uses a blood, saliva, or cheek swab sample to read the gene's DNA sequence. This can show whether you carry a harmful variant and may help confirm a suspected mitochondrial condition. Often, NDUFS7 genetic testing is included in a broader panel of related genes.
When should I consider getting a genetic test?
Genetic testing for the NDUFS7 gene may be considered when a child or adult has signs of a condition that affects how cells make energy, such as developmental delay, weak muscles, movement problems, seizures, or trouble with feeding or breathing. It can also help if Leigh syndrome or a similar inherited condition runs in the family.
A genetic result is only one part of your health story
A genetic result may provide useful information, but how much it reveals depends on the condition and the kind of variant involved. Many factors, including lifestyle, environment, age, and medical history, 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 best considered alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas such as medication response, genetic results may also help make sense of individual experiences.
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 at the drug’s target, so the same treatment may work better for one person than another. This is common and can influence how much benefit someone gets or how sensitive they are to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect a person’s response to medications. By looking at links between genes and drugs, it helps 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 treatment decisions that are more informed and more individualized. More on this topic is available in the LearnHub.
Drugs influenced by the NDUFS7 gene
When should I seek medical advice?
There isn't yet a broadly confirmed role for this gene in guiding medication choices, so general health or medicine concerns are best discussed with your doctor. Get medical advice if you notice new side effects, worsening symptoms, or more trouble with day-to-day activities after starting or changing any treatment.