The HMGB1 gene helps cells organize DNA, turn other genes on and off, and respond to damage. If it does not work properly, cells may have trouble managing stress and repair, and inflammation signals can become unbalanced. This gene also has a second role outside cells, where it can act like an alarm signal after injury or infection. HMGB1 is better known in medical research than in popular culture, especially in studies of inflammation, immune conditions, and cancer.
What is a gene?
Genes are sections of DNA that hold instructions your cells use to make molecules or regulate processes in the body. Some genes carry the directions for making proteins, which are the parts of cells that do much of the work. Other genes mostly help control when certain processes happen, where they happen, and how strongly they occur. Together, genes affect how the body develops and functions, and they can also shape how you respond to food, stress, or medications. To go into this topic in greater detail, you can find more in the LearnHub.
Overview
HMGB1Gene function
What if the gene works
The HMGB1 gene helps cells organize DNA and control which genes are active. Its protein also helps coordinate repair after cell stress and can support normal immune signaling.
Risk
What if the gene does not work
Pathogenic variants in the HMGB1 gene can cause a neurodevelopmental condition, often with developmental delay, low muscle tone, and speech or behavior differences. Effects range from mild to more marked, and some people also have brain imaging changes or seizures.
Treatment
What does that mean for your treatment
No HMGB1-specific treatment or management approach is currently established for people with a pathogenic or loss-of-function variant in the HMGB1 gene. The HMGB1 gene is being studied as a biomarker and possible drug target in inflammation, sepsis, autoimmune conditions, and some cancers, but this has not led to treatment decisions in current clinical guidelines for inherited HMGB1 variants.
Gene function
What if the gene works
Inside your cells, the HMGB1 gene helps keep DNA organized, flexible, and ready to use. Its protein attaches to DNA and helps it bend, which makes it easier for cells to read genetic instructions and carry out routine jobs. This steady work helps explain how the HMGB1 gene supports gene activity and DNA repair in everyday cell life.
The HMGB1 gene makes a protein that binds DNA and helps it bend into useful shapes. This gives other cell proteins better access to important stretches of DNA.
By loosening and arranging DNA packaging, the HMGB1 gene helps cells turn many genes on at the right time. This supports normal cell growth, response to signals, and day to day activity.
Its protein also assists with DNA copying and DNA repair, which are routine jobs every cell must manage. It acts like a DNA guide, helping repair and copying machinery work on DNA more 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, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. At times, though, a variant can change how a gene works more significantly and may contribute to or lead to a genetic condition.
Genetic variants
What if the gene does not work
HMGB1 gene variants can alter how much HMGB1 protein a cell makes or change key regions needed for DNA binding and protein interactions. Milder changes may partly reduce protein stability or activity, while more severe variants, including truncating or splice changes, can leave little or no usable protein. Some HMGB1 gene variants also affect control signals, shifting when or how strongly cells produce the protein.
How variants are linked to conditions
The HMGB1 gene does not yet have a broadly confirmed link to a specific health condition, though research on HMGB1 gene variants and disease risk is still developing. If you carry a reported variant in the HMGB1 gene, the result is best interpreted alongside your personal and family history with a doctor or genetic counselor.
A variant is not necessarily a diagnosis
Genetic variants are a normal feature of human biology and are widely seen in the general population. Most do not have a direct effect on health and instead reflect natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a confirmed diagnosis, especially when several genes and environmental factors play a role. In some cases, though, a single well characterized variant in a specific gene can be 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 HMGB1 gene. If HMGB1 is part of your test results or family history, a doctor or genetic counselor can help explain what it may mean for your personal risk.
Inheritance of HMGB1 variants
There is not yet a broadly confirmed single disease inheritance pattern for the HMGB1 gene, so how HMGB1 gene variants are inherited may depend on the specific finding and the health condition being evaluated. HMGB1 is located on chromosome 13, which is an autosome, so each person inherits one copy of the HMGB1 gene from each parent. This means HMGB1 variants are not passed in an X linked or Y linked pattern.
What does my HMGB1 result mean for my family?
For HMGB1, the best-known family pattern is dominant, which means a result linked to disease can sometimes be passed from an affected parent to a child, and close relatives may also carry the same change. At the same time, some HMGB1 changes happen for the first time in the child and are not found in either parent. What this means for family members depends on the exact HMGB1 result and the condition involved.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for HMGB1 variants usually uses a blood or saliva sample to read the HMGB1 gene and look for changes in its DNA sequence. Results may show a variant known to affect health, no relevant variant, or a variant of uncertain significance, which means the finding is not yet clearly understood.
When should I consider getting a genetic test?
There is not yet a widely accepted, HMGB1-specific reason for genetic testing in routine care. Decisions about testing are usually based on your symptoms, personal medical history, and family history, ideally with a doctor or genetic counselor.
A genetic result is only one part of your health story
A genetic finding can be informative, but how much it explains varies based on the condition and the kind of variant involved. Many other factors also influence how the body works over time, including lifestyle, environment, age, and medical history. 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 offer a clear answer. In areas such as medication response, genetic results may 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 reason is that inherited differences can change how the body breaks down, transports, or responds to a drug, which can influence both benefit and sensitivity.
What is Pharmacogenetics?
Pharmacogenetics focuses on how genetic differences affect responses to medications. It examines links between genes and drugs to help explain why the same treatment may work differently from one person to another. For many medicines, genes influence both how strongly a drug works and how the body handles it. This information can support treatment decisions that are more informed and more individualized. If you want to explore this topic further, you can learn more in the LearnHub.
Drugs influenced by the HMGB1 gene
When should I seek medical advice?
At this time, there is no broadly confirmed role for this gene in guiding how medicines are chosen or used, so any questions about treatment, side effects, or medication changes are best discussed with your doctor or pharmacist.
History
HMGB1 entered medical research through studies of “high mobility group” proteins, a name given in the 1970s because these proteins moved quickly in laboratory gels. At first, scientists mainly viewed the HMGB1 gene through its role inside the cell nucleus. Over time, scientists’ understanding of the gene’s function has changed. In the late 1990s and early 2000s, research showed that HMGB1 also had an important role outside cells, which helped reshape ideas about inflammation and tissue injury. That shift made HMGB1 a well-known example of how one gene product can be involved in very different biological processes. Since then, it has remained a major focus in immunology, cancer, and critical care research.