The RNF168 gene helps your cells spot damaged DNA and start repair, especially after everyday stress or radiation exposure. When this gene does not work well, damage can build up, and some people develop RIDDLE syndrome, a rare condition linked to repeated infections, learning difficulties, distinctive facial features, and greater sensitivity to radiation. This gene also supports normal immune system development, so changes in it can affect more than one part of the body.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some genes provide the information needed to make proteins, which are the parts of cells that do the work. Other genes mainly help direct when certain processes happen, where they occur, 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. To explore this topic in more detail, you can learn more in the LearnHub.
Overview
RNF168Gene function
What if the gene works
The RNF168 gene helps cells respond to broken DNA. Its protein adds small tags at damage sites, helping attract repair proteins and keep genetic material stable.
Risk
What if the gene does not work
When the RNF168 gene does not work properly, it can cause RIDDLE syndrome, with immune problems, sensitivity to radiation, and developmental differences. Milder to more severe variants can affect when features appear and how strongly they affect daily life.
Treatment
What does that mean for your treatment
A pathogenic variant causing loss of function in the RNF168 gene does not currently have an established RNF168-specific treatment or drug-choice guideline. The RNF168 gene is being studied in cancer and DNA-damage research as a possible biomarker and drug target, but this has not yet changed routine care.
Conditions associated with RNF168
Gene function
What if the gene works
Your cells constantly need to notice and manage small injuries in their DNA. The RNF168 gene helps run that response by marking the area around a DNA break and calling in repair helpers. This helps explain how the RNF168 gene helps repair DNA and keep the cell’s genetic instructions stable during everyday life.
The RNF168 gene adds small protein tags to DNA packaging proteins near a DNA break. These tags mark the area so the cell can focus its repair response in the right place.
These marks help attract repair proteins to the damaged spot. This lets several repair steps gather around the break in a coordinated way.
The RNF168 gene strengthens the cell’s DNA damage signal around a broken strand. This helps the cell organize repair activity and maintain stable genetic instructions.
What is a variant?
A genetic variant is a minor change in the DNA sequence within a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, or how the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some situations, though, a variant can change how a gene functions more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
In cells, how variants in the RNF168 gene affect DNA repair depends on whether the change alters the protein's shape, stability, or ability to send the small tag signals that call repair proteins to broken DNA. Milder variants may leave some activity, while more severe variants can make the protein unstable or cut it short. In people with RIDDLE syndrome, this loss of signaling can influence how early and how strongly features appear.
How variants are linked to conditions
Pathogenic variants in the RNF168 gene cause RIDDLE syndrome, a very rare inherited condition. People with this condition may have unusual sensitivity to radiation, repeated infections related to immune problems, short stature, learning difficulties, and widened small blood vessels on the skin or eyes called telangiectasias. In the current evidence on RNF168 gene variants linked to conditions, this is the main well-established diagnosis.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a normal feature of human biology. Most do not directly affect health and simply reflect natural differences between people. For many genes, a variant associated with a condition points to a possible link rather than a certain diagnosis, especially when several genes and environmental influences play a part. In some situations, though, one well understood variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the RNF168 gene. For people with a disease-causing RNF168 change, overall risk is mainly shaped by the inherited variant itself, and a doctor or genetic counselor can help explain what that may mean for the individual or family.
Inheritance of RNF168 variants
Variants in the RNF168 gene linked to RNF168-related conditions are inherited in an autosomal recessive pattern. This means a person usually inherits one altered copy from each parent, and both parents are typically carriers who often do not have symptoms themselves. When both parents carry an RNF168 gene variant, each pregnancy has a 25% chance of resulting in a child with the condition, a 50% chance of carrier status, and a 25% chance of inheriting neither variant. In practical terms, the RNF168 gene inheritance pattern means it can affect siblings even when there is no previous family history of the condition.
What does my RNF168 result mean for my family?
For families with a disease-causing RNF168 result linked to RIDDLE syndrome, the pattern is recessive, which means parents are usually healthy carriers and brothers or sisters may also be affected or be carriers. Other close relatives, such as aunts, uncles, and cousins, may also carry the same gene change. Children of someone with two changed RNF168 copies will usually be carriers unless the other parent also carries a change in RNF168.
Genetic information
Genetic testing
How you find out about variants
To look for RNF168 variants, a lab studies DNA from blood or saliva using sequencing and sometimes checks for missing or extra pieces of the gene. This is how genetic testing for RNF168 variants works, and results may identify a disease-causing variant, rule one out, or find a variant of uncertain meaning.
When should I consider getting a genetic test?
Testing for the RNF168 gene may be considered if someone has a very rare pattern of repeated infections, low antibody levels, growth or learning differences, and unusual sensitivity to radiation. It can also help if a close family member has a known RNF168 variant or a diagnosis linked to this gene.
A genetic result is only one part of your health story
Genetic results can provide valuable insight, but how much they explain depends on the condition and the type of variant involved. Over time, many other factors also shape how the body works, 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 best understood alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas such as medication response, genetic results can also help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body responds to medicines. Some people break down a drug faster or more slowly, while others may be more or less sensitive to its effects. This helps explain why the same medication can work well for one person but not as well for another, or why side effects can differ. These differences are common and can influence both how well a treatment works and how strongly your body reacts to it.
What is Pharmacogenetics?
Pharmacogenetics is the area of medicine that examines how genetic differences shape the way people respond to medications. It studies links between genes and drugs to help explain why the same treatment can affect one person differently than another. With many medicines, genes can influence how strongly a drug works or how the body handles it. This information can support treatment decisions that are better informed and more individualized. More detail on this topic is available in the LearnHub.
Drugs influenced by the RNF168 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or response. If you have concerns about side effects, unexpected drug response, or your overall health, talk with your doctor or pharmacist so they can review your medicines and medical history.
History
The RNF168 gene entered the medical literature in the late 2000s as researchers mapped the body’s response to DNA damage. Building on this early work, scientists showed that RNF168 was part of a key chain of signals that helps cells recognize broken DNA and draw repair proteins to the right spot. Interest grew further when inherited variants in the RNF168 gene were linked to a rare condition called RIDDLE syndrome, which helped confirm the gene’s importance in human health. These findings also strengthened a broader shift in genetics, showing how faults in DNA repair pathways can shape cancer risk and immune problems. Over time, studies of the RNF168 gene helped refine the wider story of how cells protect their genetic material.