The IDH1 gene helps cells turn nutrients into a small helper molecule that supports energy use and normal cell activity. If this gene works differently because of certain variants, cells can build up an abnormal chemical called 2-hydroxyglutarate, which can interfere with normal growth control. Some acquired variants in the IDH1 gene are linked to brain tumors, acute myeloid leukemia, and a few other cancers. In medicine, this gene is important because it has also become a target for some newer cancer treatments.
What is a gene?
A gene is a stretch of DNA that carries instructions your cells use to make molecules or direct activities in the body. Some genes provide the instructions for producing proteins, which are the functional parts of cells. Others mainly regulate when certain activities happen, where they happen, and how active they are. Taken together, genes affect how your body grows and works, and they can influence how you respond to food, stress, or medicines. To go deeper into this topic, you can find more in the LearnHub.
Overview
IDH1Gene function
What if the gene works
The IDH1 gene helps cells process nutrients and make NADPH, a molecule that supports normal cell growth and helps protect against oxidative stress.
Risk
What if the gene does not work
Some IDH1 variants are linked to certain brain tumors, leukemia, and cartilage tumors, while rare variants can cause D-2-hydroxyglutaric aciduria, a condition affecting development and the nervous system. Milder to more severe variants can influence which features appear and how early.
Treatment
What does that mean for your treatment
Established treatment relevance mainly applies to specific pathogenic variants in the IDH1 gene, not loss-of-function changes. In some cancers, these variants can make targeted IDH inhibitors such as ivosidenib or vorasidenib treatment options, depending on tumor type and clinical setting.
Conditions associated with IDH1
Gene function
What if the gene works
Your cells use the IDH1 gene during everyday chemical work that keeps them supplied and protected. Its protein works mainly in the cell fluid, where it helps make small molecules needed for normal cell activity. It also supports the cell’s natural defenses against routine chemical stress.
IDH1 helps change isocitrate into alpha-ketoglutarate, a small molecule used in many cell reactions. This step takes place mainly in the cell fluid and supports steady day to day metabolism.
This gene helps produce NADPH, a helper molecule cells use to recharge antioxidants. That helps your cells manage oxidative stress, which is the normal chemical wear that comes with using oxygen.
By supplying alpha-ketoglutarate and NADPH, IDH1 supports fat making and other routine cell tasks. This is part of what the IDH1 gene does in your cells to keep membranes and other structures working smoothly.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and are part of normal human diversity, including differences in 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. In some instances, though, a variant changes how a gene functions more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Many variants in the IDH1 gene, especially changes at the R132 site, alter the enzyme's shape so it makes 2-hydroxyglutarate, an abnormal chemical that can build up inside cells. This is a key way IDH1 gene variants affect cell metabolism and gene control. These changes can range from milder variants with partial activity to more disruptive variants that shift enzyme behavior more strongly. In related cancers, stronger functional effects may influence how cells grow and when disease appears.
How variants are linked to conditions
Most well-established IDH1 gene variant associations involve acquired changes in tumor cells rather than inherited changes. These IDH1 gene variants are linked to certain brain tumors, especially diffuse gliomas, and are also found in some cases of acute myeloid leukemia, cholangiocarcinoma, and chondrosarcoma. Rare inherited pathogenic variants in the IDH1 gene can cause D-2-hydroxyglutaric aciduria, a metabolic condition usually identified in childhood.
A variant is not necessarily a diagnosis
Genetic variants are a normal feature of human biology and are common throughout the general population. Most do not have a direct effect on health and simply contribute to natural human variation. For many genes, having a variant associated with a condition indicates a possible link rather than a certain diagnosis, especially when multiple genes and environmental factors also play a role. 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 isn't yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the IDH1 gene itself. In most cases, IDH1 changes linked to disease happen during life in certain cells rather than being inherited, so personal risk depends more on the specific condition and test result.
Inheritance of IDH1 variants
In the rare conditions caused by an inherited IDH1 gene variant, the IDH1 inheritance pattern is autosomal dominant. This means a parent carrying the variant can pass it to a son or daughter, and each child has a 50% chance of inheriting it. Some people with an IDH1-related condition have a new (de novo) variant that was not inherited from either parent.
What does my IDH1 result mean for my family?
There is not yet a broadly confirmed inherited pattern tied to a specific family condition for IDH1. Many IDH1 changes are found only in tumor cells and are not passed down through families. If you have a specific IDH1 result and questions about what it could mean for relatives, a doctor or genetic counselor can explain it in the context of your exact result.
Genetic information
Genetic testing
How you find out about variants
To find IDH1 variants, genetic testing analyzes DNA from tumor tissue, bone marrow, blood, or saliva, depending on whether clinicians are checking for acquired cancer changes or inherited variants. Understanding how IDH1 genetic testing works starts with a lab reading the DNA sequence of the IDH1 gene and reporting whether a variant is present.
When should I consider getting a genetic test?
Consider IDH1 testing when a brain tumor, a blood cancer called acute myeloid leukemia, or bile duct cancer is being evaluated, because changes in this gene in the tumor can help confirm the cancer type and may affect treatment choices. In most cases, this is tumor testing rather than an inherited DNA test.
A genetic result is only one part of your health story
A genetic result can 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, shape how the body functions over time. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best understood together with other parts of care. In other situations, a genetic result can offer a clear answer. In areas like medication response, genetic results may help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Two people can take the same treatment, yet one may get more benefit while another may be more sensitive to side effects, partly because their bodies absorb, break down, or handle the drug differently. This kind of variation is common and helps explain why medication response is not always the same from person to person.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect a person’s response to medications. It studies links between genes and drugs to better understand why the same treatment can work differently from one person to another. For many medicines, genes influence how strongly a drug works or how the body handles it. This information can support more informed and more individualized treatment decisions. To learn more about this topic, you can explore the LearnHub.
Drugs influenced by the IDH1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding everyday medication choices, so general concerns about medicines or side effects are best discussed with your doctor. In cancer care, IDH1 changes found in tumor cells can help guide whether certain targeted treatments may be useful, so this is most relevant when speaking with your cancer team.
History
The IDH1 gene became historically important when cancer researchers found recurring variants in brain tumors in 2008. This discovery changed how many scientists thought about cancer, because it linked altered cell metabolism with tumor development in a new way. From these first observations, research expanded steadily. Soon after, similar IDH1 gene changes were reported in acute myeloid leukemia and other cancers, helping define new disease subtypes. Over time, these findings shaped tumor classification, prognosis, and the development of targeted medicines. The IDH1 gene is now remembered as part of a major shift in cancer genetics, where metabolism moved to the center of cancer research.