The DLD gene helps your cells turn sugars and certain protein building blocks into usable energy. If you carry two nonworking variants, this can cause DLD deficiency, a rare inherited condition that may lead to low energy, high lactic acid levels, feeding problems, developmental delay, seizures, or liver problems. Symptoms can vary widely, and some people have more trouble during illness or fasting.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or regulate activities in the body. Some genes provide the directions for making proteins, which are the parts of cells that do much of the work. Other genes are used mostly to control when certain processes happen, where they happen, and how active they are. Together, genes affect how the body develops and functions, and they can also influence how you respond to food, stress, or medications. For a more detailed look at this subject, you can find additional information in the LearnHub.
Overview
DLDGene function
What if the gene works
The DLD gene helps mitochondria, your cells’ energy centers, turn food into usable energy. Its protein supports several enzyme groups that break down sugars and certain amino acids, especially in the brain, muscles, and liver.
Risk
What if the gene does not work
When the DLD gene does not work properly, the body may struggle to make energy, leading to low muscle tone, seizures, developmental delay, lactic acidosis, or liver problems. Milder and more severe variants can affect timing and severity.
Treatment
What does that mean for your treatment
No DLD-specific treatment or drug choice approach is currently established in clinical guidelines; care is tailored to the person's metabolic needs rather than to the DLD gene itself. The DLD gene is being studied as a marker of cell metabolism and as a possible drug target in cancer and mitochondrial research.
Conditions associated with DLD
Gene function
What if the gene works
Your cells use the DLD gene to help turn food into usable energy, mainly inside mitochondria, the cell’s energy centers. It supports several enzyme teams that process sugars and certain amino acids. Understanding how the DLD gene helps make energy shows why it matters for steady, day to day cell function.
Inside mitochondria, this gene helps enzyme teams release energy from food. That energy is then passed into the cell’s main energy making pathways, which support routine tasks like movement, growth, and repair.
One key job is helping process pyruvate, a product of glucose breakdown. This step links sugar use to the citric acid cycle, the series of reactions cells use to harvest energy.
Its protein also helps cells handle certain amino acids from dietary protein, especially branched chain amino acids such as leucine, isoleucine, and valine. This gives cells another way to use nutrients in everyday metabolism.
After each reaction, the DLD protein helps reset these enzyme machines so they can be used again. It does this by moving electrons (tiny energy carrying charges) from one step to the next.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These differences are common and help account for normal human diversity, such as variation in appearance, metabolism, or how the body responds to environmental influences. Many variants do not cause any noticeable effect and simply represent natural genetic variation. In some cases, though, a variant can change how a gene functions more substantially and may contribute to or lead to a genetic condition.
Genetic variants
What if the gene does not work
Variants in the DLD gene can alter the enzyme’s shape or stability, making it less able to bind FAD, a helper molecule, or work with nearby protein partners in mitochondria, the cell’s energy making parts. In how DLD gene variants affect enzyme activity, a spectrum is seen: some leave partial function, while more severe variants sharply reduce or stop activity. This difference can influence how early DLD deficiency appears and how wide ranging its features may be.
How variants are linked to conditions
Pathogenic variants in the DLD gene cause dihydrolipoamide dehydrogenase deficiency, a rare inherited condition sometimes called lipoamide dehydrogenase deficiency. This DLD gene condition can affect energy use in the body and is linked to episodes of lactic acidosis, low muscle tone, developmental concerns, seizures, or liver problems. Some people also have features that overlap with maple syrup urine disease.
A variant is not necessarily a diagnosis
Genetic variants are a usual feature of human biology and are found commonly across the general population. Most do not directly affect health and instead represent natural differences among people. For many genes, having a variant associated with a condition points to a possible link rather than a certain diagnosis, particularly when several genes and environmental factors play a role. In some situations, though, one well-characterized variant in a particular gene is enough to establish a diagnosis.
Are there things that can increase or change my risk?
For DLD, the main risk is inherited: a child is affected when they receive a harmful DLD change from both parents. In people living with DLD-related illness, infections, fasting, and other body stresses can trigger or worsen episodes. Lifestyle changes do not remove the inherited risk.
Inheritance of DLD variants
DLD-related disease is inherited in an autosomal recessive pattern. This means a person usually develops the condition only when they inherit two altered copies of the DLD gene, one from each parent. Parents who each carry one altered copy are typically unaffected carriers, and with each pregnancy they have 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 typical copies. This pattern of DLD gene inheritance affects males and females equally.
What does my DLD result mean for my family?
For families with a disease-causing DLD result, parents are often healthy carriers, and brothers or sisters may also be affected or may be carriers. Close relatives on both sides of the family can sometimes carry the same gene change without knowing it. This can matter for future pregnancies and for relatives who are planning children.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for variants in the DLD gene usually uses a blood or saliva sample to read the DLD gene and look for changes in its DNA code. Testing may be done as a single-gene test, part of a broader metabolic gene panel, or through exome sequencing, which reads many genes at once.
When should I consider getting a genetic test?
Consider DLD genetic testing if a baby or child has repeated episodes of vomiting, unusual sleepiness, seizures, high acid levels in the blood, or unexplained liver or brain problems, especially during illness. Testing is also worth discussing if DLD deficiency runs in the family or a relative has a known DLD variant.
A genetic result is only one part of your health story
A genetic result may provide useful insight, but how much it reveals depends on the condition and the kind of variant involved. Many factors, including lifestyle, environment, age, and medical history, influence how the body functions over time. For some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and is most helpful when considered alongside other aspects of care. In other situations, a genetic result may give 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 responds to medicines. Some people break down a drug more slowly or more quickly than others, which can change how well it works or how likely side effects are. These differences are common and are one reason the same treatment can feel helpful for one person but less effective or harder to tolerate for another. Medication response is also shaped by age, kidney and liver function, other health conditions, and other medicines you take.
What is Pharmacogenetics?
The field of pharmacogenetics examines how genetic differences affect the way people respond to medications. It looks at gene-drug patterns to help explain why the same treatment can work differently from one person to another. For many medicines, genes influence either how strongly a drug works or how the body processes it. This information can support more informed and more individualized treatment decisions. If you want to read more about this topic, you can learn more in the LearnHub.
Drugs influenced by the DLD 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 new symptoms are best discussed with your doctor or pharmacist.
History
The DLD gene entered medical genetics through studies of children with rare energy metabolism conditions, especially those affecting the brain and liver. Initially understood only through visible traits, later recognized as tied to a specific gene, this work helped connect unexplained episodes of low energy, developmental concerns, and metabolic crises to an inherited cause. In the later 20th century, researchers showed that changes in the DLD gene could disrupt a shared part of several enzyme systems, which clarified why symptoms could vary from one person to another. From these first observations, research expanded steadily. This history placed the DLD gene among the important early examples of how gene testing could explain rare metabolic conditions that had once been difficult to classify.