The HSD17B8 gene helps your cells handle certain fats inside mitochondria, the parts of the cell that make energy, and it also helps process some hormones. The protein made by this gene helps your cells keep energy production running smoothly. When both copies do not work as they should, a person may develop a rare inherited mitochondrial condition with developmental delay, low muscle tone, vision problems, or seizures.
What is a gene?
A gene is a stretch of DNA that holds instructions your cells use to make molecules or regulate processes in the body. Some genes provide the code for proteins, which are the active parts of cells. Others mostly guide when certain processes happen, where they happen, and how active they are. Taken together, genes affect how the body grows and works, and they can influence how you react to food, stress, or medications. For a deeper look at this topic, you can read more in the LearnHub.
Overview
HSD17B8Gene function
What if the gene works
The HSD17B8 gene helps your cells process certain fats inside mitochondria, the parts of cells that make energy. It also takes part in changes involving some sex hormones.
Risk
What if the gene does not work
Variants in the HSD17B8 gene can reduce this enzyme’s ability to process certain steroid hormones and related molecules inside cells. Milder variants may leave some activity, while more severe variants can disrupt these chemical steps more strongly.
Treatment
What does that mean for your treatment
For pathogenic or loss-of-function variants in the HSD17B8 gene, no gene-specific treatment or drug choice approach is currently established.
Gene function
What if the gene works
Your cells use the HSD17B8 gene to fine tune certain steroid hormones. Its protein makes small chemical changes that switch these molecules from one form to another. Understanding what the HSD17B8 gene does in your cells helps explain how tissues manage everyday hormone signals.
Inside cells, the HSD17B8 protein makes small chemical changes that turn one steroid form into another. These routine steps help hormone molecules be handled in a controlled way.
One well known role is changing estradiol into estrone, two closely related forms of estrogen. This helps tissues fine tune estrogen signals from moment to moment.
What is a variant?
A genetic variant is a small change in the DNA sequence within a gene. These changes are common and help explain normal human diversity, such as 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 substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the HSD17B8 gene can change the shape, stability, or activity of its enzyme, so cells may process key mitochondrial fatty acid intermediates less efficiently. In this way, HSD17B8 gene variants may weaken how well the protein binds its usual targets or may cause it to break down sooner than expected. Some variants are milder and leave partial activity, while more severe variants can greatly reduce or nearly eliminate enzyme function.
How variants are linked to conditions
The HSD17B8 gene does not yet have a broadly confirmed link to a specific health condition, and research on HSD17B8 gene variants and health conditions is still developing. Anyone with a confirmed diagnosis involving the HSD17B8 gene should rely on guidance from their doctor or genetic counselor rather than general information.
A variant is not necessarily a diagnosis
In the general population, genetic variants are common and are a normal part of human biology. Most do not directly affect health and instead reflect natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes and environmental factors are involved. In some situations, though, a single well-characterized variant in a specific 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 HSD17B8 gene. If a change in HSD17B8 has been found in you or your family, a doctor or genetic counselor can help explain what that result may mean for your personal risk.
Inheritance of HSD17B8 variants
HSD17B8-related conditions are inherited in an autosomal recessive pattern. This means a child usually inherits one altered copy of the HSD17B8 gene from each parent, and the parents are typically healthy carriers. When both parents carry an HSD17B8 gene variant, each pregnancy has a 25% chance of being affected, a 50% chance of producing a carrier child, and a 25% chance of producing a child without the familial variant. In practical terms, how HSD17B8 variants are inherited depends on both parents passing on the altered copy.
What does my HSD17B8 result mean for my family?
There is not yet a broadly confirmed family inheritance pattern tied to a specific condition for HSD17B8, although this can become clearer as research grows. If you have a specific HSD17B8 result and want to understand what it could mean for relatives, a doctor or genetic counselor can explain it in the context of your family history and the exact result.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for the HSD17B8 gene looks for variants by reading the DNA code from a blood sample, saliva, or a cheek swab. A lab compares your sequence in the HSD17B8 gene with the usual reference sequence and reports whether a variant was found, along with its known clinical meaning.
When should I consider getting a genetic test?
There isn't yet a broadly established, HSD17B8-specific clinical reason for testing. Testing decisions are best made with a doctor or genetic counselor who can look at your symptoms, family history, and the wider picture.
A genetic result is only one part of your health story
A genetic test result can provide meaningful insight, but how much it reveals depends on the condition and the type of variant involved. Many other factors, including lifestyle, environment, age, and medical history, also shape how the body works over time. For some conditions, particularly those influenced by many genes, genetic information provides context rather than certainty and is best understood alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as 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 because the body does not process the same drug in exactly the same way from one person to another. These inherited differences are common and can influence how well a treatment works or how sensitive someone is to side effects. In some cases, a medicine may stay in the body longer, be cleared faster, or be changed into its active form differently, which can shape the overall response.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect a person’s response to medicines. It studies the relationship between genes and medications to help explain why the same treatment may work differently from one person to another. For many drugs, genes influence both how the body processes a medicine and how strong its effects are. This information can support more informed, more personalized treatment decisions. More detail is available in the LearnHub.
Drugs influenced by the HSD17B8 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choices, so any questions about medicines, side effects, or changes in your health are best discussed with your doctor.