The ABHD12 gene helps break down certain fats in the brain, eyes, inner ear, and nerves. If it does not work properly, these fats can build up and gradually affect balance, movement, hearing, and vision. Pathogenic variants in the ABHD12 gene can cause a condition called PHARC, which may include nerve damage, hearing loss, unsteady walking, cataracts, and retinal changes that reduce sight. This gene is mainly known in medical genetics rather than popular culture.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some genes provide the directions for producing proteins, which are the working parts of cells. Other genes mainly help control the timing, location, and strength of certain processes. Together, genes affect how the body develops and works, and they can also shape 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
ABHD12Gene function
What if the gene works
The ABHD12 gene helps break down certain fats in the brain and immune system. This supports balanced cell signaling, helps control inflammation, and contributes to healthy nerve function.
Risk
What if the gene does not work
Pathogenic variants in the ABHD12 gene can cause PHARC, which often affects balance, peripheral nerves, hearing, and vision. Effects can range from milder to more severe, influencing when symptoms begin and which features appear.
Treatment
What does that mean for your treatment
No treatment or drug choice strategy specific to the ABHD12 gene is currently established. Care is guided by symptoms rather than by the variant itself. Early research is exploring the ABHD12 gene as a possible drug target because it affects lipid signals linked to nerve and immune function.
Conditions associated with ABHD12
Gene function
What if the gene works
The ABHD12 gene helps your cells manage a small group of fats that act as signals and parts of cell membranes. Its protein is an enzyme, which means it breaks down selected fats so they stay in balance. Understanding what the ABHD12 gene does in the body helps explain how cells keep lipid signals steady from day to day.
The ABHD12 gene makes an enzyme that breaks down certain fats, especially lysophosphatidylserine. This keeps these fats within their usual range and supports normal cell chemistry.
Some fats also work as messengers between cells. By clearing selected lipid signals, ABHD12 helps keep this communication more controlled, including in nerve and immune cells.
ABHD12 also helps remove altered forms of a membrane fat called phosphatidylserine. This supports membrane maintenance and helps cells handle routine wear and tear.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These differences are common and help shape normal human diversity, such as variation in appearance, metabolism, or how the body responds to environmental influences. Many variants do not cause any noticeable effects and are simply part of natural genetic variation. In some cases, 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
Most disease linked variants in the ABHD12 gene reduce or remove the enzyme's activity, often by shortening the protein, altering its working site, or making it unstable. Studies of ABHD12 gene variants and protein function show that milder changes may leave some activity, while more severe variants can stop the protein from being made at all. Less remaining activity is generally linked to earlier and broader PHARC features.
How variants are linked to conditions
Pathogenic variants in both copies of the ABHD12 gene cause PHARC syndrome, a rare inherited condition that can involve balance problems, nerve symptoms, hearing loss, vision changes from retinitis pigmentosa, and cataracts. The link between variants in the ABHD12 gene and PHARC syndrome is well established, and finding disease-causing variants on both copies can confirm the diagnosis. Signs often vary between people and may appear gradually over time.
A variant is not necessarily a diagnosis
Genetic variants are a normal and common part of human biology. Most do not have a direct effect on health and simply 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 can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For ABHD12-related disease, risk is mainly determined by whether someone inherits changed copies of the ABHD12 gene from both parents. There is not yet broadly confirmed evidence that lifestyle or environmental factors meaningfully increase or reduce this genetic risk.
Inheritance of ABHD12 variants
For people asking about the ABHD12 inheritance pattern, disease-causing variants in the ABHD12 gene are inherited in an autosomal recessive way. This means a person usually needs to inherit one altered copy from each parent to have an ABHD12-related condition. Parents who each carry one variant are often unaffected themselves, but with each pregnancy they have a 25% chance of having a child with the condition, a 50% chance of having a child who is a carrier, and a 25% chance of having a child who inherits neither variant. Because ABHD12 is on chromosome 20, this pattern is the same for males and females.
What does my ABHD12 result mean for my family?
For families affected by changes in the ABHD12 gene, the condition is usually passed down in a recessive pattern. This means parents are often healthy carriers, and brothers and sisters may also be carriers or, in some families, may also have the condition. Close relatives may want to learn whether the same gene change runs in the family.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for variants in the ABHD12 gene usually uses a blood or saliva sample to read this gene and look for changes linked to PHARC syndrome. Results may show a pathogenic variant, a benign variant, or a variant of uncertain significance, which means a change was found but its health effect is still unclear.
When should I consider getting a genetic test?
Genetic testing for ABHD12 may be worth considering if someone has a rare pattern of nerve problems, balance trouble, hearing loss, and worsening vision, especially when these start at a young age. It can also help when this condition runs in the family or when a relative already has an ABHD12 change.
A genetic result is only one part of your health story
A genetic result may provide useful insight, but what it can tell you varies with the condition and the kind of variant found. Over time, many factors, including lifestyle, environment, age, and medical history, influence how the body functions. For some conditions, particularly those shaped by many genes, genetic information offers context rather than certainty and makes the most sense when considered with other parts of care. In other situations, a genetic result can give a clear answer. In areas like medication response, genetic results may help put personal experiences in context.
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 reason is that inherited differences can change how the body absorbs, breaks down, transports, or responds to a drug. These differences are common and can influence both how well a medicine works and how sensitive a person is to it.
What is Pharmacogenetics?
Pharmacogenetics is the area of study that looks at how differences in genes can affect the way a person responds to medicines. It examines gene drug patterns to help explain why the same treatment may work differently in different people. With many medications, genes can influence either how powerful the drug’s effect is or how the body handles it. This information can support treatment decisions that are more informed and tailored to the individual. More detail on this topic is available in the LearnHub.
Drugs influenced by the ABHD12 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dose. If you have concerns about side effects, how well a treatment is working, or possible medicine interactions, discuss them with your doctor so they can review your medicines and overall health.