Your cells depend on the NAXE gene to repair damaged forms of energy helper molecules, which helps keep energy production running smoothly. If the gene does not work properly, these damaged molecules can build up, especially during fever or illness, and some people may develop episodes of weakness, trouble moving, seizures, or loss of skills. Severe harmful variants in the NAXE gene are linked to a rare inherited brain condition that often starts in infancy or early childhood.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or regulate activities in the body. Some genes provide the directions for producing proteins, the parts of cells that do the work. Others mainly help determine 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 influence how you respond to food, stress, or medications. You can find more detail on this topic in the LearnHub.
Overview
NAXEGene function
What if the gene works
The NAXE gene helps repair damaged forms of NADH and NADPH (molecules cells use to make energy). This supports healthy cell function, especially in the brain, muscles, and other tissues with high energy needs.
Risk
What if the gene does not work
More disruptive variants in the NAXE gene can cause a rare metabolic brain condition, often with episodes after fever or infection. People may develop poor balance, muscle weakness, developmental regression, or seizures, with severity ranging from episodic to life limiting.
Treatment
What does that mean for your treatment
No NAXE-specific treatment or management approach is currently established in clinical guidelines. In reported cases, clinicians have used vitamin B3 forms such as niacin or nicotinamide and careful supportive care during illness, but this remains based on limited evidence rather than a standardized drug pathway.
Conditions associated with NAXE
Gene function
What if the gene works
Your cells constantly use small helper molecules to make energy and manage everyday chemical stress. The NAXE gene helps keep two of these helpers, NADH and NADPH, in a usable form. This repair work supports steady cell activity across the body.
The NAXE gene helps repair damaged forms of NADH and NADPH that appear during normal cell activity. It changes these altered molecules into the form needed for the next step of metabolite repair (a cleanup process for worn or damaged cell chemicals).
By helping preserve usable NADH and NADPH, NAXE supports how cells turn nutrients into energy. This keeps routine cell work running in a more stable way from moment to moment.
Some damaged NADH and NADPH forms can get in the way of enzymes, the proteins that drive many cell reactions. NAXE helps limit that interference by preparing these molecules to be restored and reused.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These differences are common and help explain normal human diversity, such as variations in appearance, metabolism, or how the body responds to environmental influences. Many variants do not cause any noticeable effect and simply represent natural genetic variation. Sometimes, however, a variant can change how a gene works more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the NAXE gene can make the protein unstable, misshapen, or too short, which reduces or abolishes its repair activity and lets damaged NAD(P)H byproducts build up inside cells. Some single-letter changes leave part of the activity intact, while variants that shorten the protein or disrupt how the cell reads the gene often cause a larger loss of function. These NAXE gene variant effects on protein function can influence how early the related neurologic condition begins and how severe episodes become.
How variants are linked to conditions
Pathogenic variants in both copies of the NAXE gene cause a rare inherited condition called progressive encephalopathy with brain edema and/or leukoencephalopathy 1, often called NAXE-related disease. Symptoms usually begin in infancy or early childhood and may include developmental regression, seizures, low muscle tone, stiffness, and problems with balance or movement. In everyday terms, the main conditions linked to NAXE gene variants involve episodes of neurologic decline, sometimes after a fever or infection.
A variant is not necessarily a diagnosis
Variants in genes are a routine feature of human biology and are widely found across the population. Most do not directly affect health and simply contribute to normal human diversity. 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 play a part. In some situations, though, one well-defined variant in a particular gene is enough to establish a diagnosis.
Are there things that can increase or change my risk?
For NAXE, the chance of having the condition is mainly determined by the gene changes you inherit from your parents, rather than by lifestyle. In people already living with NAXE-related disease, infections, fever, or other physical stress can trigger sudden worsening, so early treatment of illness and close monitoring can help lower the risk of complications.
Inheritance of NAXE variants
NAXE-related conditions are inherited in an autosomal recessive pattern. This means a person usually develops the condition only if they inherit two disease-causing variants in the NAXE gene, one from each parent. Parents who each carry one variant are typically unaffected carriers, and 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 with no familial variant. In families asking how NAXE gene variants are inherited, this pattern means the variant can be passed to sons and daughters equally.
What does my NAXE result mean for my family?
For families with a disease-causing change in the NAXE gene, the pattern is usually recessive, which means close relatives may also carry the change without having symptoms. Brothers and sisters could be affected or be carriers, and parents are often carriers. Children of someone with a NAXE-related condition will usually be carriers unless the other parent also carries a disease-causing NAXE change.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for NAXE gene variants usually uses a blood or saliva sample to read the DNA sequence of the NAXE gene. It can show whether you carry a variant linked to a known inherited condition, although some results are unclear and need expert interpretation.
When should I consider getting a genetic test?
Consider NAXE testing if a child has unexplained episodes of severe weakness, loss of skills, balance problems, or seizures after a fever or infection, especially if brain scans suggest this rare inherited condition. Testing may also help when a sibling or close relative has a confirmed NAXE change.
A genetic result is only one part of your health story
A genetic result can provide valuable insight, but what it can explain varies with the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, also affect how the body functions. For some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is most useful when considered alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas like medication response, it can also help put individual experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in genes can change how the body breaks down a drug, moves it through the body, or responds to it at its target. This is a common reason why the same medication may work well for one person, work less well for another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes affect the way they respond to medicines. It studies patterns between genes and drugs to help explain why the same treatment can work differently in different people. For many medications, genes influence both how strongly a drug works and 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 NAXE 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 used. If a medicine is causing side effects, not working as expected, or you have general health concerns, discuss them with your doctor or pharmacist.
History
NAXE entered the genetics literature under a different name, APOA1BP, because researchers first linked it to apolipoprotein A-I. As medical science evolved, so did understanding of this gene. Later studies showed that its main role was different from what had first been proposed, and the gene was renamed NAXE. Scientific classifications changed as researchers learned more about the gene. Interest in NAXE grew further when inherited variants were tied to a rare neurological condition with episodes of sudden worsening, especially during illness or fever. That shift, from an early name based on a presumed binding partner to a clearer identity and clinical relevance, shaped how NAXE is understood today.