The CREBBP gene helps control when many other genes are switched on, especially during growth, brain development, and the formation of bones and other tissues. The protein made by this gene helps your cells read and use genetic instructions at the right time. If the CREBBP gene does not work properly, it can cause Rubinstein-Taybi syndrome, a condition that often involves developmental delay, learning difficulties, short stature, and broad thumbs or big toes. Some variants in the CREBBP gene are also linked to certain cancers, usually when the change happens only in tumor cells rather than being inherited.
What is a gene?
Genes are segments of DNA that carry instructions cells use to make molecules or regulate processes in the body. Some genes hold the information needed to make proteins, the functional parts of cells. Others mainly guide when certain processes occur, where they occur, and how strongly they run. Together, genes influence how the body develops and works, and they can shape how you respond to food, stress, or medications. More on this topic is available in the LearnHub.
Overview
CREBBPGene function
What if the gene works
The CREBBP gene helps switch other genes on at the right time. This supports normal growth, brain development, and the way cells respond to signals and repair everyday wear.
Risk
What if the gene does not work
Changes in the CREBBP gene most often cause Rubinstein-Taybi syndrome, with developmental delay, learning difficulties, and facial and thumb features. Milder to more severe variants can shape when features appear, their range, and, in some people, cancer risk.
Treatment
What does that mean for your treatment
No treatment or drug choice guideline specific to a pathogenic or loss of function variant in the CREBBP gene is currently established. CREBBP is being studied in cancer research as a biomarker and possible treatment target, but this has not yet led to standard care.
Conditions associated with CREBBP
Gene function
What if the gene works
Your cells use the CREBBP gene to help decide which DNA instructions should be read at a given time. It acts like a coordinator, linking signal-reading proteins with the machinery that switches genes on. This steady control supports normal growth, development, and everyday cell activity.
One of its main roles is to help your cells turn selected genes on at the right time. It does this by connecting DNA-binding proteins with the cell machinery that reads genetic instructions.
Through its protein, the CREBBP gene adds small chemical tags called acetyl groups to histones, the spool-like proteins that package DNA. This loosens tightly packed DNA so important genes are easier for cells to read.
Inside your cells, the CREBBP gene helps bring several control proteins together in one place. This makes gene control more coordinated and helps cells respond smoothly to normal signals.
This gene helps coordinate gene activity needed for growth, development, and cells taking on specialized jobs. That steady control is part of how the CREBBP gene helps turn other genes on in a measured, organized way.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and help shape normal differences among people, including appearance, metabolism, and how the body responds to environmental influences. Many variants have no noticeable effect and are simply part of natural genetic variation. In some cases, 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
Variants in the CREBBP gene can change the CBP protein so it is shortened, unstable, or less able to bind other proteins and add acetyl groups (small chemical tags) that help control gene activity. In plain terms, this is how CREBBP gene variants affect protein function at the cell level. Milder variants may leave some CBP activity, while more severe variants, including truncating or whole-gene losses, can cause a larger functional drop and are often linked to earlier or more noticeable CREBBP-related features.
How variants are linked to conditions
Pathogenic variants in the CREBBP gene most often cause Rubinstein-Taybi syndrome type 1, a condition linked with developmental delay, learning difficulties, distinctive facial features, broad thumbs or big toes, and short stature. In some people, specific CREBBP variants are linked to Menke-Hennekam syndrome 1, which can affect development and behavior in a different pattern. The CREBBP gene and Rubinstein-Taybi syndrome are the main well-established association seen in genetic medicine.
A variant is not necessarily a diagnosis
Gene variants are a normal part of human biology and are widely seen in the general population. Most do not have a direct effect 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 multiple genes and environmental factors play a part. In some situations, though, a single well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For CREBBP-related conditions, risk is mostly determined by whether a disease-causing change in the CREBBP gene is present, and it can be higher when the change runs in a family. There is not enough evidence to say that lifestyle or environmental factors lower or raise the chance of having the condition itself.
Inheritance of CREBBP variants
Most disease causing changes in the CREBBP gene are inherited in an autosomal dominant pattern, which is the main answer to how CREBBP gene variants are inherited. This means one altered copy can be enough to cause a CREBBP related condition, and a parent carrying the variant can pass it to any child, son or daughter, with a 50% chance in each pregnancy. Many people with a CREBBP related condition have a new, de novo variant, meaning it started in them and was not inherited from either parent.
What does my CREBBP result mean for my family?
For CREBBP-related conditions, the pattern is usually dominant, so a parent, brother, sister, or child may also carry the same gene change and could consider genetic testing. Each child of someone with a disease-causing CREBBP change may have a 1 in 2, or 50%, chance of inheriting it. Some cases happen as a new gene change, so the result is not always inherited from a parent.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the CREBBP gene, clinicians use genetic testing on a blood or saliva sample. Genetic testing for variants in the CREBBP gene reads the DNA code and compares it with the usual sequence to look for changes. Results may show a pathogenic variant, a benign variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
Genetic testing for the CREBBP gene can be worth considering when a child has signs of Rubinstein-Taybi syndrome, such as delayed development, broad thumbs or big toes, short stature, or typical facial features. It can also help if there is a family history of this condition or a known CREBBP change in the family.
A genetic result is only one part of your health story
Genetic results can provide useful insight, but how much they explain varies based on the condition and the specific type of variant. 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 offers context rather than certainty and is best understood as part of the broader picture of care. In other situations, a genetic result may offer a clearer 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. Small differences in genes can change how the body breaks down a drug, moves it through the body, or responds to it at its target, so the same treatment may work better for one person than another. This is a common reason why some people get good results, while others may notice less benefit or be more sensitive to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines the ways genetic differences shape how people respond to medicines. It studies gene-drug patterns to help explain why the same treatment can affect one person differently than another. With many medications, genes influence either how powerfully a drug works or how the body handles it. This information can support treatment choices that are more informed and tailored to the individual. More detail on this subject is available in the LearnHub.
Drugs influenced by the CREBBP gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding routine medication choices, so concerns about side effects, new symptoms, or how well a treatment is working are best discussed with your doctor. Research on CREBBP is ongoing in cancer care, where changes in tumor cells may affect response to some treatments, but this is not yet standard prescribing guidance.
History
Since the earliest days of medicine, efforts have been made to understand inherited patterns. The CREBBP gene entered medical genetics through work on Rubinstein-Taybi syndrome, a condition first described in the 1960s from shared physical features and developmental differences seen across unrelated children. In the 1990s, researchers linked some cases to changes on chromosome 16 and then identified the CREBBP gene as a major cause. From these first observations, research expanded steadily. Scientists also recognized that CREBBP was closely related to another gene, EP300, which helped clarify why the two genes can be tied to similar clinical pictures. Over time, this work made CREBBP an important part of the story of modern developmental genetics.