The BDH1 gene makes an enzyme that helps your body switch between two ketones, which are backup fuels used during fasting, long exercise, or illness. This gene helps your body keep energy available when sugar stores are low. If the gene does not work properly, ketone balance can be disrupted, which may make it harder for the body to manage energy needs during physical stress. Rare harmful variants in the BDH1 gene have been linked to problems with ketone metabolism.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or direct activities in the body. Some genes carry the code for proteins, which do much of the work inside cells. Others mainly regulate when, where, and how strongly certain activities take place. Taken together, genes affect how the body develops and functions, and they can also influence how you respond to food, stress, and medications. For a deeper look at this topic, more information is available in the LearnHub.
Overview
BDH1Gene function
What if the gene works
The BDH1 gene helps your body use ketones, an alternative fuel made during fasting or long exercise. Its protein converts one ketone form into another, supporting energy balance in tissues such as the liver, heart, and brain.
Risk
What if the gene does not work
Changes in the BDH1 gene can reduce how well cells switch between two ketone bodies, a backup fuel used during fasting. Milder variants may partly lower this activity, while more severe variants can cause a larger loss of enzyme function.
Treatment
What does that mean for your treatment
No treatment or drug choice approach specific to the BDH1 gene is currently established in clinical guidelines for people with pathogenic variants in this gene. The BDH1 gene is being studied in metabolic and cancer research as a marker of ketone use and a possible future drug target.
Gene function
What if the gene works
Ketones are an important backup fuel when glucose is less available. Your cells use the BDH1 gene to handle these fuels inside mitochondria, the parts of cells that make energy. This is a key part of how the BDH1 gene helps use ketones for energy during fasting or longer exercise.
The BDH1 gene helps cells convert acetoacetate and beta-hydroxybutyrate, the two main ketones, back and forth. This lets the body match the ketone form to current energy needs.
When glucose is lower, this gene helps tissues use ketones as another energy source. This supports energy supply during fasting, longer exercise, or low carbohydrate intake.
Its protein works with NAD and NADH (molecules that carry energy in cells) during ketone conversion. This helps mitochondria keep reactions that produce energy moving in a steady, balanced way.
What is a variant?
Genetic variants are small differences in a gene’s DNA sequence. They are common and help explain normal human variation, such as differences in appearance, metabolism, and the way the body responds to environmental influences. Many have no noticeable effect and are simply part of natural genetic diversity. In some cases, though, a variant changes how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the BDH1 gene can change how much BDH1 enzyme a cell makes or how well the enzyme folds, binds NAD (a helper molecule used in energy transfer), and carries out ketone body conversion in mitochondria. This is how BDH1 gene variants affect enzyme activity at a cellular level. Some variants may partly reduce activity, while more disruptive variants can leave little or no functional enzyme.
How variants are linked to conditions
Variants in the BDH1 gene do not yet have a broadly confirmed link to a specific health condition, and research on BDH1 gene variants and health conditions is still developing. If you carry a reported BDH1 variant as part of a confirmed diagnosis, your doctor or genetic counselor can place that result in the context of your personal and family history.
A variant is not necessarily a diagnosis
Variants in genes are a routine and common part of human biology across the general population. Most do not directly affect health and instead reflect normal human diversity. For many genes, having a variant associated with a condition points to a possible link, not a definite diagnosis, particularly when several genes and environmental factors play a role. In other situations, one well-characterized variant in a particular gene is 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 risk related to the BDH1 gene. Anyone with concerns about their personal or family risk can talk with a doctor or genetic counselor.
Inheritance of BDH1 variants
There is not yet a broadly confirmed, disease-specific pattern for inheritance of the BDH1 gene variants, and this understanding may become clearer as research develops. The BDH1 gene is located on chromosome 3, which is an autosome, so you inherit one copy of the gene from your mother and one copy from your father.
What does my BDH1 result mean for my family?
For the rare health condition linked to the BDH1 gene, the usual pattern is recessive, which means close relatives could be carriers even if they have no symptoms. Brothers and sisters may also share the same gene change, while children are more often carriers unless the other parent also carries a BDH1 change. This can be useful information for family planning and for relatives who are thinking about whether to look into their own genetic results.
Genetic information
Genetic testing
How you find out about variants
A blood, saliva, or cheek swab sample can be used for BDH1 genetic testing to look for variants in the BDH1 gene. The lab reads your DNA, compares the gene sequence with the usual reference sequence, and reports whether a variant was found and how clearly it is understood.
When should I consider getting a genetic test?
There is not yet a broadly established reason to test the BDH1 gene on its own for most people. Testing is usually considered only as part of a wider genetics workup when someone has unexplained signs of a rare energy or ketone-body condition, or a family history that points in that direction.
A genetic result is only one part of your health story
A genetic finding can provide valuable insight, but how much it explains varies by the condition and the type of variant involved. Lifestyle, environment, age, and medical history are among the many factors that influence how the body functions over time. In some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is most useful when considered together with other parts of care. In other situations, a genetic result can offer a clear answer. In areas like medication response, genetic 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. This helps explain why the same treatment works well for one person, seems weaker for another, or causes more side effects in someone else. Part of the difference comes from how the body breaks down, moves, or responds to a drug, and these inherited differences are common.
What is Pharmacogenetics?
Pharmacogenetics is the area of study that examines how genetic differences shape medication response. It looks at relationships between genes and drugs to help explain why the same treatment can affect people in different ways. For many medicines, genes can influence both how the body handles a drug and how strong its effects are. This information can support more informed, more individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the BDH1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in how people respond to medicines, so questions about treatment, side effects, or possible drug interactions are best discussed with your doctor.