The DBH gene gives your body instructions to make an enzyme that converts dopamine into norepinephrine, a chemical messenger that supports blood pressure, heart rate, and the stress response. This gene helps your body keep automatic body functions such as blood pressure control more stable. If the gene does not work well, norepinephrine can be too low, which may cause dizziness or fainting when standing, droopy eyelids, and marked tiredness. Rare, severe variants in the DBH gene cause dopamine beta-hydroxylase deficiency, while more common variants may have little or no noticeable effect.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or to manage processes in the body. In some cases, those instructions are for making proteins, the parts of cells that do much of the work. Other genes mainly direct when certain processes happen, where they take place, and how strongly they operate. As a whole, genes affect how the body develops and functions, and they can shape how you respond to food, stress, or medications. To go deeper into this topic, you can find more in the LearnHub.
Overview
DBHGene function
What if the gene works
The DBH gene helps your body turn dopamine into norepinephrine, which helps nerves send signals. This supports blood pressure and your response to stress.
Risk
What if the gene does not work
More severe variants in the DBH gene can cause dopamine beta-hydroxylase deficiency, with low norepinephrine, marked dizziness or fainting on standing, droopy eyelids, and exercise intolerance. Milder variants may leave more enzyme activity, so features can vary.
Treatment
What does that mean for your treatment
Pathogenic loss-of-function variants in the DBH gene can directly guide treatment, because droxidopa is a well-established therapy that helps the body make norepinephrine. This often improves dizziness or fainting from low blood pressure, and drugs that lower blood pressure may need extra caution.
Conditions associated with DBH
Gene function
What if the gene works
The DBH gene helps your body make norepinephrine, a chemical messenger used by certain nerves and the adrenal glands. This messenger helps with attention, blood vessel tone, and normal stress signaling. Understanding how the DBH gene supports norepinephrine production helps show its place in everyday body control.
The DBH gene provides instructions for an enzyme that changes dopamine into norepinephrine. This step happens inside tiny storage sacs in certain nerve cells and in the adrenal glands.
By helping produce norepinephrine, this gene supports messages in parts of the nervous system that help control focus, heart rate, and blood vessel tone. It helps your body adjust smoothly to everyday changes in activity and attention.
In the adrenal glands, the protein made from the DBH gene supports normal norepinephrine release into the bloodstream during daily physical or emotional demands. This helps coordinate alertness and other automatic body responses.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and help make up normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some cases, though, a variant can more substantially change how a gene functions and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Changes in the DBH gene can alter how the enzyme is folded, stabilized, or released, which may reduce its activity. Milder variants may leave some activity, while more severe changes that shorten the protein or disrupt the gene message can leave little or none. This helps explain how DBH gene variants affect enzyme activity and why dopamine beta-hydroxylase deficiency can vary in when features appear and how marked they are.
How variants are linked to conditions
Pathogenic variants in the DBH gene cause dopamine beta-hydroxylase deficiency, a rare inherited condition often marked by very low blood pressure when standing, drooping eyelids, and ongoing nasal congestion. In this setting, finding disease-causing variants in the DBH gene can confirm the diagnosis. Other common changes in the DBH gene have been studied for links to blood pressure and some neurologic or psychiatric conditions, but those findings are less consistent and do not by themselves predict disease.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are widely found in the general population. Most do not have a direct impact on health and instead represent natural human diversity. For many genes, carrying a variant associated with a condition indicates a possible link rather than a confirmed diagnosis, especially when several genes and environmental factors contribute. In some situations, 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 increase or reduce health risks related to the DBH gene. For rare inherited changes in DBH, risk is mainly shaped by the genetic change itself rather than everyday lifestyle factors, so personal questions about risk are best discussed with a doctor or genetic counselor.
Inheritance of DBH variants
DBH gene variants linked to dopamine beta-hydroxylase deficiency are inherited in an autosomal recessive pattern. This means a person usually has to inherit one altered copy of the DBH gene from each parent to have the condition. Parents who each carry one variant are typically unaffected carriers, and with each pregnancy there is 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 two usual copies of the gene. Sons and daughters are affected at the same rate.
What does my DBH result mean for my family?
For families, a DBH result usually matters most when both parents carry a changed copy of the gene. Brothers and sisters may also be affected or may be healthy carriers, and other relatives could be carriers too. Family testing can sometimes clarify who else in the family may have the same inherited change.
Genetic information
Genetic testing
How you find out about variants
DBH genetic testing uses DNA from blood, saliva, or a cheek swab to look for variants in the DBH gene. A lab reads the gene's code and compares it with the usual sequence. Results may show a benign variant, a disease causing variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
Genetic testing for the DBH gene may be worth considering if someone has repeated severe drops in blood pressure when standing, fainting, droopy eyelids, or ongoing nasal stuffiness that started early in life, especially with a family history of the same pattern. It can also help clarify a diagnosis when doctors suspect the rare condition linked to DBH changes.
A genetic result is only one part of your health story
Genetic findings can offer valuable insight, but what they reveal depends on the condition and the type of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, influence how the body works. For some conditions, especially those affected by many genes, genetic information provides context rather than certainty and is best considered together with other parts of care. In other situations, a genetic result may give a clear answer. In areas like 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 genes 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 treatment may work well for one person but less well for another, or why some people are more likely to notice side effects. These differences are common and are only one part of the picture, alongside age, overall health, and other medicines.
What is Pharmacogenetics?
Pharmacogenetics examines the ways genetic differences shape a person’s response to medicines. By studying links between genes and medications, it helps explain why the same treatment can affect people differently. With many drugs, genes influence both how strongly a medicine works and how the body handles it. This understanding can support treatment choices that are more informed and tailored to the individual. To explore this topic further, you can find more information in the LearnHub.
Drugs influenced by the DBH gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medicine choice or dose, so general questions about symptoms, side effects, or medicines are best discussed with your doctor. Research on the DBH gene has looked at whether it may affect response to some brain and blood pressure medicines, but this is not used routinely in care.
History
The DBH gene entered medical genetics through research on the body’s stress-related chemical messengers in the mid 20th century. Scientists first studied dopamine beta-hydroxylase as an enzyme in nerve cells and adrenal tissue before linking differences in its activity to inherited variation. From these first observations, research expanded steadily. By the late 20th century, the DBH gene had been mapped and sequenced, which helped connect rare inherited forms of very low enzyme activity with a recognizable clinical picture. Later studies also explored common DBH variants in relation to blood pressure, autonomic symptoms, and some brain-related traits, though these links are more complex and not diagnostic on their own. This work helped place the DBH gene within the broader history of neurotransmitter and autonomic research.