The EHHADH gene gives cells instructions for an enzyme that helps break down certain fats inside peroxisomes, small structures that process fats. This gene helps your body use these fats in a controlled way, especially in the kidneys and liver. Some variants in the EHHADH gene can disrupt kidney tubule function and cause Fanconi syndrome, a condition where useful substances leak into the urine. This may show up as thirst, weakness, soft bones, or poor growth.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate activities in the body. Some genes provide the directions for making proteins, the parts of cells that do much of the work. Other genes mainly help determine when certain processes happen, where they take place, and how strongly they are active. Together, genes affect how the body develops and functions, and they can also influence how you respond to food, stress, or medications. For a more in depth look at this topic, you can learn more in the LearnHub.
Overview
EHHADHGene function
What if the gene works
The EHHADH gene helps your cells break down certain fatty acids inside peroxisomes, small structures that process fats. This supports normal energy use, especially in the liver and kidneys.
Risk
What if the gene does not work
Some variants in the EHHADH gene are linked to Fanconi kidney syndrome, where kidney tubules leak important substances into urine. Effects can range from milder to more marked, influencing when problems appear and how strongly kidney function is affected.
Treatment
What does that mean for your treatment
No EHHADH-specific treatment or drug choice is currently established for people with pathogenic variants in the EHHADH gene. The EHHADH gene is being studied as a metabolic biomarker in some cancers, but this has not led to routine gene-directed treatment.
Conditions associated with EHHADH
Gene function
What if the gene works
Your cells need a steady way to handle certain fats inside small compartments called peroxisomes. The EHHADH gene helps keep that process moving by supporting key steps in fat breakdown. Understanding how the EHHADH gene helps break down certain fats makes it easier to see how cells manage routine fat chemistry.
The EHHADH gene helps cells shorten certain fatty acids inside peroxisomes, which are small compartments that handle specialized fat processing. This turns larger fat molecules into smaller pieces the body can reuse or process further.
Its protein performs two back to back reactions during beta oxidation (the stepwise shortening of fats). Keeping both steps in one protein helps this part of fat processing stay coordinated.
Its protein works alongside other peroxisome proteins to move fat processing forward efficiently. This supports normal handling of fatty compounds before other parts of the cell finish using or clearing them.
What is a variant?
A genetic variant is a small difference in the DNA sequence within a gene. These differences are common and help account for normal human diversity, such as variation in appearance, metabolism, or how the body responds to environmental influences. Many have no noticeable effect and simply represent natural genetic variation. In some situations, though, a variant can change how a gene functions more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the EHHADH gene can change the protein’s shape, stability, or where it travels inside the cell, which helps explain how EHHADH gene variants affect fatty acid processing inside cells. Some milder variants may leave partial activity, while more disruptive variants can sharply reduce activity or misdirect the protein to mitochondria instead of peroxisomes. In the kidney linked form that is best established, stronger functional disruption can be tied to earlier or more noticeable features.
How variants are linked to conditions
Variants in the EHHADH gene are mainly linked to Fanconi renotubular syndrome 3, a rare inherited kidney condition. This diagnosis can be confirmed when a disease-causing variant in the EHHADH gene is found. People with this condition may lose substances such as phosphate, glucose, and amino acids into the urine, which can contribute to weak bones, muscle symptoms, or reduced kidney function.
A variant is not necessarily a diagnosis
Variants in genes are a normal feature of human biology and are widely seen in the general population. Most do not have a direct effect on health and simply reflect natural variation among people. For many genes, having a variant linked to a condition suggests a possible association rather than a confirmed diagnosis, especially when several genes and environmental factors also play a part. In other 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?
There is not yet broadly confirmed evidence on specific factors that clearly increase or reduce health risks related to the EHHADH gene. Risk, if present, depends mainly on the exact genetic change and the condition it is linked to, rather than on known lifestyle factors. Anyone worried about personal risk should speak with a doctor or genetic counselor.
Inheritance of EHHADH variants
For families learning how EHHADH gene variants are inherited, the best established pattern is autosomal dominant. This means a person with a disease causing variant in one copy of the EHHADH gene can pass it to a child, whether a son or daughter, with a 50% chance in each pregnancy. The same chance applies in every pregnancy, regardless of previous children. Inherited EHHADH-related kidney disease has been described across generations in families, which fits this dominant pattern.
What does my EHHADH result mean for my family?
For the kidney condition linked to the EHHADH gene, the pattern in families is usually dominant, which means close relatives such as a parent, brother, sister, or child may also carry the same gene change. If one family member has a disease-causing EHHADH result, other close relatives may want to learn whether they have it too, especially if they have signs like kidney problems, weak bones, or low phosphate. Not everyone in a family is affected in exactly the same way.
Genetic information
Genetic testing
How you find out about variants
Variants in the EHHADH gene are found with genetic testing, usually using a blood or saliva sample checked in a lab by sequencing or a kidney gene panel. EHHADH genetic testing can show whether you carry a variant, and results may be clearly linked to disease, clearly not linked, or still unclear.
When should I consider getting a genetic test?
Consider EHHADH testing if you or a family member has an inherited kidney tubule problem, especially Fanconi syndrome, where the kidneys leak substances like sugar, phosphate, and amino acids into the urine. It can also help explain ongoing low phosphate, bone softening, or weakness when these problems run in families.
A genetic result is only one part of your health story
A genetic result can be very informative, but what it tells you depends on the condition involved and the type of variant present. Lifestyle, environment, age, and medical history, among other factors, also influence how the body functions over time. For some conditions, especially those shaped by many genes, genetic information provides 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, these results can also help make sense of individual experiences.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Two people can take the same treatment at the same dose, yet one may get better symptom relief while the other may notice less benefit or more side effects. This happens in part because inherited differences can change how the body breaks down, transports, or responds to a drug, and these differences are common.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can shape a person’s response to medications. It studies links between genes and drugs to help explain why the same treatment can work differently from one person to another. For many medicines, genes influence how strongly a drug works or how the body handles it. This understanding can support more informed, individualized treatment decisions. To explore this topic in more detail, you can learn more in the LearnHub.
Drugs influenced by the EHHADH gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in medication response, so questions about side effects, poor benefit, or medicine choices are best discussed with your doctor.