The LIAS gene gives your cells instructions to make lipoic acid, a small helper molecule that several enzymes in the cell’s energy centers need to turn food into energy. This gene helps your body keep energy production steady, especially in organs with high energy needs like the brain. If the LIAS gene does not work well in both copies, people may develop a rare inherited condition with seizures, low muscle tone, feeding trouble, high lactic acid, and delayed development.
What is a gene?
Genes are pieces of DNA that carry instructions your cells use to make molecules or regulate activities in the body. Some genes provide the code for proteins, which do much of the work inside cells. Others mainly direct when certain processes happen, where they happen, and how active they are. In combination, genes affect how the body develops and works, and they may also shape how you respond to food, stress, and medicines. More detail is available in the LearnHub.
Overview
LIASGene function
What if the gene works
Your cells rely on the LIAS gene to make lipoic acid, a helper molecule used inside mitochondria. This supports energy production and the breakdown of certain amino acids.
Risk
What if the gene does not work
Variants in the LIAS gene can impair energy production, causing a rare condition with seizures, developmental delay, and high lactate and glycine levels. Effects can range from early, severe illness to milder presentations, depending on how much LIAS activity remains.
Treatment
What does that mean for your treatment
No treatment or drug choice linked specifically to the LIAS gene is currently established. Care is supportive, with seizure and metabolic treatment tailored to the person rather than directed by the gene change. Lipoic acid supplements have been tried in some reports, but they have not shown a consistent guideline based benefit.
Conditions associated with LIAS
Gene function
What if the gene works
Your cells use the LIAS gene to make lipoic acid, a small helper molecule needed by certain proteins inside mitochondria, the parts of cells that release energy from food. This is central to how the LIAS gene helps mitochondria make energy from nutrients. It also supports normal glycine breakdown.
Inside mitochondria, the LIAS gene helps make lipoic acid, a small helper molecule that certain proteins need to work. This step lets those proteins take part in normal energy making and nutrient handling.
By supplying this helper molecule, the LIAS gene supports enzyme groups that turn sugars and some amino acids into usable energy. This is a core part of how cells meet everyday energy demands.
The LIAS gene also supports the protein system that processes glycine, an amino acid your body uses every day. This helps cells manage nutrients in a steady, balanced way.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and help explain normal differences between people, including appearance, metabolism, and the way the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. Sometimes, though, a variant changes how a gene works more significantly and can contribute to or lead to a genetic condition.
Genetic variants
What if the gene does not work
LIAS gene variants can reduce or block the enzyme’s ability to complete lipoic acid synthesis, leaving several mitochondrial proteins without their lipoic acid helper attached. This weakens enzyme complexes that cells use to process fuel. More disruptive variants often leave little or no activity and are linked to earlier, more severe symptoms in LIAS deficiency, while milder variants may preserve some function.
How variants are linked to conditions
Among LIAS gene related conditions, the main well-established one is LIAS deficiency, also called lipoic acid synthetase deficiency or combined oxidative phosphorylation deficiency 27. Pathogenic variants in both copies of the LIAS gene cause this rare inherited condition. It is linked to early life neurologic and metabolic problems, often including developmental delay, seizures, feeding difficulties, lactic acidosis, and high glycine levels in blood or cerebrospinal fluid.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of being human and are widely seen in the general population. 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 also contribute. In some situations, though, a single well-characterized variant in a particular gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For LIAS, risk is mainly shaped by whether a child inherits harmful changes in both copies of the gene, so family history and whether both parents are carriers matter most. There is not broadly confirmed evidence that lifestyle or environmental factors meaningfully change the chance of developing a LIAS-related condition.
Inheritance of LIAS variants
LIAS-related conditions are inherited in an autosomal recessive pattern. In practical terms, how LIAS gene variants are inherited usually means a child must receive one changed copy of the LIAS gene from each parent to be affected. Parents who each carry one variant are usually unaffected themselves, 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 working copies. Sons and daughters are affected equally.
What does my LIAS result mean for my family?
For LIAS, the main family implication is usually a recessive pattern, which means parents of an affected child are often healthy carriers. Brothers and sisters may also be affected or may be carriers, and other close relatives could carry the same gene change without knowing it. This can matter for future pregnancies and for relatives who want to understand their own carrier status.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the LIAS gene, genetic testing reads the gene's DNA from a blood sample, saliva, or cheek swab. This explains how LIAS genetic testing works: your sequence is compared with the usual code to see whether a variant is present. Results may confirm a diagnosis or clarify carrier status.
When should I consider getting a genetic test?
Genetic testing for the LIAS gene may be considered if a baby or child has unexplained severe seizures, high lactic acid on blood tests, low muscle tone, or major developmental delay, especially when these problems start early. It can also help when a close family member has a harmful LIAS variant or a child with this rare inherited condition.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it explains depends on the condition and the specific type of variant. Over time, many factors shape how the body functions, including lifestyle, environment, age, and medical history. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is most helpful when viewed 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 context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body handles some medicines, so the same treatment may work differently from one person to another. Small inherited differences can change how a drug is absorbed, broken down, moved through the body, or how strongly the body responds to it. This is common and may influence how well a medicine works or how likely side effects are. Pharmacogenetic results are only one part of the picture, alongside age, liver and kidney function, other medicines, and overall health.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes affect the way a person responds to medication. It studies connections between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes influence both how strongly a drug works and how the body handles it. This information can support treatment decisions that are more informed and more individualized. More details on this topic are available in the LearnHub.
Drugs influenced by the LIAS gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen or adjusted. If you have concerns about side effects, unexpected reactions, or how a treatment fits with your health history, it is best to speak with your doctor.
History
Interest in the LIAS gene grew from studies of lipoic acid, a vitamin-like helper substance identified in the mid 20th century. As medical science evolved, so did understanding of this gene. Researchers later connected the human LIAS gene to the body’s own lipoic acid production, and rare inherited LIAS variants were eventually recognized in children with early onset neurologic and metabolic illness. These findings linked older laboratory chemistry with modern genetic diagnosis. Although the LIAS gene has remained mostly within specialist medicine, its history reflects the wider move from observing biochemical changes to pinpointing the exact gene involved.