The RNASEH2B gene helps cells remove small pieces of RNA that end up in DNA, which keeps genetic material stable. This gene plays an important role in stopping the immune system from reacting as if this buildup were a viral threat. If it does not work properly, ongoing inflammation can develop, and severe inherited variants in both copies of the gene can cause Aicardi-Goutières syndrome, a condition that often affects the brain, skin, and development. It is mainly known in medical genetics rather than in popular culture.
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 carry the directions for proteins, the parts of cells that do the work. Other genes mainly guide when certain activities take place, where they happen, and how strongly they are carried out. Together, genes affect how the body grows and functions, and they can also shape how you respond to food, stress, and medicines. More information on this topic is available in the LearnHub.
Overview
RNASEH2BGene function
What if the gene works
The RNASEH2B gene helps your cells remove misplaced RNA pieces from DNA. This supports normal DNA copying and repair and helps keep genetic material stable.
Risk
What if the gene does not work
Variants in the RNASEH2B gene can cause Aicardi-Goutières syndrome, which may affect brain development, movement, and skin; effects range from mild to early-onset forms, and milder or more severe variants can shape when features appear and how extensive they are.
Treatment
What does that mean for your treatment
No treatment or management approach specifically tied to pathogenic or loss-of-function variants in the RNASEH2B gene is currently established. In cancer research, loss of the RNASEH2B gene is being studied as a possible biomarker for response to PARP inhibitors in some tumors.
Conditions associated with RNASEH2B
Gene function
What if the gene works
Every time a cell copies its DNA, tiny cleanup steps keep the genetic code usable. The RNASEH2B gene helps direct RNase H2, a cell cleanup team that works where RNA and DNA meet. Understanding what the RNASEH2B gene does in the body helps explain how cells protect DNA during everyday growth and repair.
The RNASEH2B gene helps the RNase H2 team find RNA building blocks that were accidentally placed into DNA. Removing these misplaced pieces helps keep DNA stable and ready for normal cell use.
Your cells sometimes make short stretches that contain both RNA and DNA during routine work. RNASEH2B helps the RNase H2 team trim the RNA part so DNA copying and normal gene activity can continue smoothly.
RNASEH2B helps bring this cleanup team close to the DNA copying machinery during cell division. This supports accurate DNA duplication and steady everyday cell function.
What is a variant?
Genetic variants are small differences in the DNA sequence of a gene. They are common and help account for normal differences among people, such as appearance, metabolism, or the way the body responds to environmental influences. Many have no noticeable effect and are simply part of natural genetic variation. Sometimes, however, a variant changes how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
RNASEH2B gene variants can make the protein unstable, change its shape, or stop it from joining the RNase H2 group of proteins, which helps explain how RNASEH2B gene variants affect protein function. This lowers the cell's ability to clear misplaced RNA from DNA. Milder variants may leave some activity, while more disruptive variants can greatly reduce or nearly abolish it. In Aicardi-Goutières syndrome, less remaining activity often links to earlier onset and a broader range of features.
How variants are linked to conditions
Pathogenic variants in the RNASEH2B gene are a well-established cause of Aicardi-Goutières syndrome type 2, a rare inherited condition that can affect brain development, movement, and the immune system. Most people diagnosed have disease-causing variants in both copies of the gene. Some studies have also linked certain RNASEH2B changes to an illness with lupus features, but Aicardi-Goutières syndrome is the main confirmed RNASEH2B-related condition.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are widely present in the general population. Most have no direct impact 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 also play a part. 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 RNASEH2B, risk is mainly shaped by whether a child inherits harmful changes in both copies of the gene. People with one changed copy are usually healthy carriers, but if both parents carry one, each pregnancy has a 25% chance of the child having the condition. Lifestyle factors are not known to meaningfully change this genetic risk.
Inheritance of RNASEH2B variants
RNASEH2B-related conditions are inherited in an autosomal recessive pattern. In practical terms, how RNASEH2B variants are inherited usually means a child receives one changed copy of the RNASEH2B gene from each parent. If both parents carry one variant, each pregnancy has a 25% chance of producing a child with the condition, a 50% chance of producing a child who is a carrier, and a 25% chance of producing a child with two usual copies. This pattern affects children of any sex equally.
What does my RNASEH2B result mean for my family?
For families with a disease-causing RNASEH2B result, this condition is usually passed down in a recessive pattern, which means parents are often healthy carriers. Brothers and sisters may also be affected or may be carriers, and other close relatives could be carriers too. Because of that, family members may want to talk with their care team about whether genetic testing would be useful for them.
Genetic information
Genetic testing
How you find out about variants
To look for changes in the RNASEH2B gene, genetic testing for RNASEH2B variants is usually done on a blood or saliva sample. A lab reads the gene’s DNA sequence and may also check for missing or extra pieces. Results can show whether a variant is present, but interpretation depends on the exact change found.
When should I consider getting a genetic test?
Genetic testing for the RNASEH2B gene may be worth considering when a baby or child has signs of Aicardi-Goutières syndrome, such as early developmental delay, seizures, unusual stiffness, or brain inflammation with no clear cause. It can also help when this condition runs in the family or when both parents are known carriers.
A genetic result is only one part of your health story
A genetic result may offer helpful insight, but how much it can tell you depends on the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, affect how the body works. In some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is best considered alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas such as medication response, genetic results can also help place individual 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, has less effect in another, or causes more side effects in someone else. Part of the difference comes from how the body breaks down, moves, or responds to a drug. These differences are common and can influence both how well a medicine works and how sensitive a person may be to it.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect the way people respond to medications. By looking at links between genes and drugs, it helps explain why the same treatment may work differently from one person to another. For many medicines, genes can influence how strongly a drug works or how the body processes it. This information can support more informed and individualized treatment decisions. More on this topic is available in the LearnHub.
Drugs influenced by the RNASEH2B gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication response, so questions about medicines, side effects, or new symptoms are best discussed with your doctor.
History
Throughout history, doctors described children with an inflammatory brain condition later named Aicardi-Goutières syndrome, long before its genetic causes were known. In the 2000s, researchers linked some of these cases to changes in the RNASEH2B gene, helping show that the condition could result from inherited variants in several related genes. From these first observations, research expanded steadily. RNASEH2B soon became recognized as one of the most common genes involved in Aicardi-Goutières syndrome, which gave families a clearer explanation for a condition that had often been difficult to classify. This discovery also helped shape a broader shift in medicine, as scientists began connecting rare childhood inflammatory conditions with specific genetic causes.