The RRM2 gene helps make the DNA building blocks your cells need to grow, divide, and repair everyday wear and tear. The protein made by this gene helps your cells keep a steady supply of these materials, especially when new cells are being formed. If the gene does not work properly, cells may struggle to copy and repair DNA, which can disrupt normal growth and body function. Rare inherited variants in the RRM2 gene are linked to conditions that can affect development, muscles, and the nervous system.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or guide processes throughout the body. Some provide the information needed to produce proteins, which are the parts of cells that do the work. Others mostly help regulate when certain processes happen, where they happen, and how strongly they occur. Taken together, genes affect how the body grows and works, and they can influence how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
RRM2Gene function
What if the gene works
The RRM2 gene helps cells make the DNA building blocks needed for growth and repair. This supports normal cell division and helps tissues renew themselves.
Risk
What if the gene does not work
If the RRM2 gene works less well, cells may make too few DNA building blocks for DNA copying and repair. Milder variants may partly reduce this enzyme's activity, while more severe variants can disrupt it more strongly.
Treatment
What does that mean for your treatment
At present, no treatment or management approach specific to a pathogenic variant in the RRM2 gene is established. In research, the RRM2 gene is being studied as a cancer drug target and biomarker, but this has not led to guideline based care for inherited RRM2 variants.
Gene function
What if the gene works
Your cells rely on the RRM2 gene to make the raw materials needed for DNA. It supports normal cell growth, planned cell division, and routine DNA upkeep. When this gene is working properly, cells can build and maintain DNA in a steady, controlled way.
The RRM2 gene helps cells turn RNA ingredients into DNA ingredients called deoxyribonucleotides. These are the basic pieces your body uses to copy DNA accurately.
Many growing cells need the RRM2 gene when they prepare to divide. It helps provide enough DNA material at the right time so each new cell can receive a full set of genetic instructions.
Your cells also use the RRM2 gene during DNA repair, which is the process of fixing routine DNA damage. By supplying fresh DNA building blocks, it supports normal maintenance of the genetic code.
What is a variant?
A genetic variant is a slight difference in the DNA sequence of a gene. These differences are common and help shape normal human diversity, including variation in appearance, metabolism, or how the body responds to environmental influences. Many have no noticeable effect and are simply part of natural genetic variation. Sometimes, though, a variant changes how a gene functions more substantially and can contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the RRM2 gene can lower the amount of RRM2 protein, make it unstable, or weaken the enzyme complex that makes DNA building blocks. This pattern is central to how RRM2 gene variants affect protein function: milder changes may leave some activity, while more severe variants can leave very little or none. This loss of function can impair mitochondrial DNA maintenance, and more disruptive variants are often linked to earlier and more severe mitochondrial DNA depletion syndrome.
How variants are linked to conditions
Among variants in the RRM2 gene and related health conditions, the main confirmed link is a very rare inherited mitochondrial DNA depletion syndrome. Biallelic pathogenic variants in the RRM2 gene can cause this condition and may lead to developmental delay, seizures, muscle weakness, and kidney problems. Symptoms often begin in infancy or childhood, and the severity can vary from person to person.
A variant is not necessarily a diagnosis
Genetic variants are a common and normal feature of human biology across the general population. Most do not directly affect health and simply reflect natural human diversity. For many genes, having a variant associated with a condition points to a possible link rather than a clear diagnosis, particularly when several genes and environmental influences play a role. In some situations, though, one well-characterized variant in a particular 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 RRM2 gene. People with questions about their personal or family risk can talk with a doctor or genetic counselor.
Inheritance of RRM2 variants
Disease-causing variants in the RRM2 gene are inherited in an autosomal recessive pattern. This means a child usually needs to inherit one changed copy from each parent to have an RRM2-related condition, while parents with one changed copy are typically carriers. When both parents carry the same RRM2 gene variant, each pregnancy has a 25% chance of an affected child, a 50% chance of a carrier child, and a 25% chance of a child without the variant. This RRM2 gene inheritance pattern affects males and females equally because the gene is on chromosome 2.
What does my RRM2 result mean for my family?
For the condition linked to RRM2, the family pattern is usually recessive. This often means parents are healthy carriers, brothers and sisters may also have the condition or be carriers, and close relatives may wish to learn whether they carry the same gene change. Children of someone with an RRM2-related condition will usually be carriers unless the other parent also carries an RRM2 change.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for RRM2 variants usually uses a blood or saliva sample to read the DNA code in the RRM2 gene, often as part of a multigene panel or exome test. Results may show no variant, a benign variant, a variant of uncertain significance, or a pathogenic variant linked to disease.
When should I consider getting a genetic test?
There is not yet a broadly established reason to test the RRM2 gene on its own for most people. Testing choices are usually based on your symptoms, medical findings, and family history, and are best made with a doctor or genetic counselor.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but what it can tell you varies with the condition and the type of variant involved. Many other factors, including lifestyle, environment, age, and medical history, also shape how the body functions over time. In some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is most helpful when considered with other parts of care. In other situations, a genetic result may offer a clear answer. In areas like 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 people respond to medicines. This helps explain why the same treatment may work well for one person, seem less effective for another, or cause more side effects in someone else. Part of the difference comes from how the body absorbs, breaks down, and uses a drug, and these pathways can vary from person to person. These differences are common and are one reason medication response is not exactly the same for everyone.
What is Pharmacogenetics?
Pharmacogenetics is the area of study that examines how genetic differences affect the way people respond to medications. It looks at gene and drug patterns to help explain why the same treatment can work differently in different people. With many medicines, genes can influence how strongly a drug works or how the body handles it. This information can help guide more informed and individualized treatment decisions. More on this topic is available in the LearnHub.
Drugs influenced by the RRM2 gene
When should I seek medical advice?
There is not yet a widely confirmed use of this gene to guide medicine choices, so any concerns about side effects, treatment response, or new symptoms are best discussed with your doctor. RRM2 has been studied in cancer research because it may influence how some chemotherapy medicines work, but this is not part of routine treatment decisions.