The GREM1 gene helps control how tissues grow by dampening certain growth signals during early development and in adult tissues. In medicine, this gene is important because it helps regulate cell growth in the lining of the bowel. If it does not work normally or is too active, cells can grow in a less controlled way. A specific inherited change near the GREM1 gene can cause hereditary mixed polyposis syndrome, with multiple colon polyps and a higher chance of colorectal cancer.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or regulate processes in the body. Some genes hold the code for proteins, the parts that carry out much of a cell’s work. Others mainly direct when certain processes happen, where they happen, and how strongly they run. Together, genes affect how the body develops and functions, and they can influence how you respond to food, stress, or medications. For a more in depth look at this topic, you can find more in the LearnHub.
Overview
GREM1Gene function
What if the gene works
The GREM1 gene makes a protein that helps control growth signals in tissues. It helps guide development before birth and supports the balance of cell growth and repair later in life.
Risk
What if the gene does not work
Changes affecting the GREM1 gene can have milder or stronger effects and may influence when problems appear. Well-established regulatory variants can cause hereditary mixed polyposis syndrome, with multiple colon or rectal polyps and a higher colorectal cancer risk.
Treatment
What does that mean for your treatment
A pathogenic variant affecting the GREM1 gene can change management by prompting earlier and more frequent colonoscopy, with removal of polyps as they appear. If the polyp burden becomes hard to control endoscopically, preventive colorectal surgery may be considered. No drug choice is currently guided specifically by the GREM1 gene.
Conditions associated with GREM1
Gene function
What if the gene works
Before birth, your body needs carefully timed growth signals so tissues form in the right place. The GREM1 gene helps fine tune some of those signals, especially BMP signals (growth messages that help shape tissues). Understanding how the GREM1 gene works helps explain how developing tissues stay organized.
The GREM1 gene makes a protein that sits outside cells and binds certain BMP signals (growth messages that help shape tissues). This softens those messages so growth and cell specialization stay better balanced.
During early development, this gene helps nearby tissues respond to growth signals at the right time and place. That supports orderly patterning as limbs and other organs take shape.
By adjusting BMP activity, the GREM1 gene helps cells shift from multiplying to taking on more specific jobs. This supports steady tissue building during development.
What is a variant?
A genetic variant is a minor difference in the DNA sequence of a gene. These differences are common and help shape normal human diversity, such as differences in appearance, metabolism, or how the body responds to environmental influences. Many variants do not have any noticeable effect and simply reflect natural genetic variation. In some situations, though, a variant can change how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Most disease-linked changes in the GREM1 gene sit in nearby control DNA, where they can switch the gene on too strongly rather than alter the protein itself. This is how GREM1 gene variants affect function: cells may make too much gremlin-1, changing local growth signals. Stronger regulatory variants, such as larger duplications, can raise expression more than milder changes and may be linked to earlier or more extensive polyp growth in hereditary mixed polyposis syndrome.
How variants are linked to conditions
Variants affecting the GREM1 gene are most clearly linked to hereditary mixed polyposis syndrome 1, an inherited condition that causes mixed types of colon and rectal polyps and can raise colorectal cancer risk. This GREM1 gene link to colon polyps and colorectal cancer is best documented in families of Ashkenazi Jewish ancestry, but it can be seen in other groups as well.
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 do not have a direct effect on health and instead reflect normal 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 contribute. 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?
There is not yet broadly confirmed evidence on specific factors that clearly increase or reduce risk linked to GREM1 itself. For many living with a harmful GREM1 change, risk is shaped mainly by the inherited variant, family history, and whether bowel polyps develop over time. Anyone worried about personal cancer risk should speak with a doctor or genetic counselor.
Inheritance of GREM1 variants
GREM1-related hereditary mixed polyposis syndrome follows an autosomal dominant inheritance pattern. This means a parent with the familial GREM1 variant can pass it to a child of any sex, and each pregnancy carries a 50% chance of inheriting that variant. In practical terms, how GREM1 variants are inherited does not depend on whether the parent is the mother or the father. A person who does not inherit the family variant usually cannot pass it on to their children.
What does my GREM1 result mean for my family?
For the GREM1 change linked to hereditary mixed polyposis syndrome, the family pattern is usually dominant, which means close relatives can also carry it. Parents, brothers, sisters, and children may want to consider discussing testing because each child of someone with this result has a 1 in 2, or 50%, chance of having the same change. Relatives who carry it can have a higher chance of developing many colon polyps and colorectal cancer.
Genetic information
Genetic testing
How you find out about variants
To find out about variants in the GREM1 gene, doctors use genetic testing on a blood or saliva sample. A lab reads your DNA and looks for changes linked to inherited colorectal polyp and cancer risk. Results may show a pathogenic variant, a benign variant, or a change whose meaning is still unclear.
When should I consider getting a genetic test?
Consider GREM1 testing if you or close relatives have had many colon polyps, colorectal cancer, or a family history of hereditary mixed polyposis syndrome, especially in families of Ashkenazi Jewish background. A harmful GREM1 change can confirm an inherited condition linked to higher bowel cancer risk.
A genetic result is only one part of your health story
Genetic test results can provide meaningful information, but how much they reveal varies by the condition and the specific variant involved. Age, environment, lifestyle, and medical history also 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 most useful when viewed alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as medication response, genetic results can also help make sense of individual experiences.
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. Some people break down a drug more slowly or more quickly, while others are more or less sensitive to its effects. These differences are common and can influence how well a treatment works and how your body handles it.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can shape a person’s response to medicines. By studying the relationship between genes and drugs, it helps explain why the same treatment can work differently from one person to another. For many medications, genes influence both how strongly a drug works and how the body processes it. This information can support treatment decisions that are more informed and more individualized. More detailed information on this topic is available in the LearnHub.
Drugs influenced by the GREM1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or response, so questions about side effects, new symptoms, or whether a treatment is right for you are best discussed with your doctor.
History
The GREM1 gene entered medical research in the late 1990s, when scientists identified gremlin as part of a group of genes involved in early body development. Early work came largely from laboratory studies that mapped how this gene was switched on during embryo formation. From these first observations, research expanded steadily. Years later, GREM1 gained clearer clinical importance when an inherited change near the gene was linked to hereditary mixed polyposis syndrome in some families, especially those of Ashkenazi Jewish background. That finding helped explain a long recognized pattern of colorectal polyps and bowel cancer risk running through certain families. Since then, GREM1 has remained part of ongoing research into inherited digestive tract conditions.