The SRCAP gene helps switch other genes on and off at the right time, especially during growth and development. If it does not work properly, the body may have trouble following normal growth signals. Pathogenic variants in the SRCAP gene are linked to Floating-Harbor syndrome, a condition that can involve short stature, delayed speech, and distinctive facial features. Severity can vary from person to person.
What is a gene?
Genes are stretches of DNA that provide your cells with instructions to make molecules or regulate processes in the body. Some genes hold the information needed to produce proteins, the working parts of cells. Others mainly guide when certain processes happen, where they take place, and how strongly they are carried out. 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
SRCAPGene function
What if the gene works
The SRCAP gene helps cells package DNA and control when other genes are switched on. This supports normal growth, development, and the copying of DNA during cell division.
Risk
What if the gene does not work
Pathogenic variants in the SRCAP gene can cause Floating-Harbor syndrome, often with short stature, delayed speech, and distinctive facial features. Milder and more severe variants can affect when features appear and how pronounced they are.
Treatment
What does that mean for your treatment
A pathogenic or loss-of-function variant in the SRCAP gene does not currently point to a specific medication or gene-directed treatment in clinical guidelines; treatment is guided by the person’s symptoms and supportive care needs.
Conditions associated with SRCAP
Gene function
What if the gene works
The SRCAP gene helps your cells manage how DNA is packed and used. Its protein works on chromatin, the mix of DNA and proteins that stores your genetic instructions. In simple terms, SRCAP gene function supports orderly gene activity so cells can follow the right program at the right time.
The SRCAP gene helps rearrange chromatin, the package of DNA and proteins inside each cell. This keeps important stretches of DNA more available or more tucked away as needed.
Its protein helps place H2A.Z, a special DNA packing protein, into the right spots. This fine tunes how tightly DNA is wrapped and how easily nearby genes can be read.
By shaping access to DNA, the SRCAP gene supports turning many genes on or off at the right time. This helps cells grow, mature, and carry out routine tasks in an organized way.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These changes are common and are part of normal human diversity, including differences in appearance, metabolism, and how the body responds to environmental influences. Many variants do not cause any noticeable effect and simply reflect 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
How changes in the SRCAP gene affect the protein depends on the variant. Most established disease-causing variants stop the protein early near the end of the gene, leaving a shortened version that is missing key DNA-binding regions and may disturb chromatin remodeling (how cells open and close DNA). Milder variants may preserve more activity, while more disruptive variants often interfere more strongly and can be linked to earlier or more noticeable features of Floating-Harbor syndrome.
How variants are linked to conditions
Pathogenic variants in the SRCAP gene cause Floating-Harbor syndrome, a condition linked with short stature, delayed speech and language development, and characteristic facial features. In someone with typical clinical features, finding a disease-causing SRCAP variant can confirm the diagnosis. This SRCAP gene and Floating-Harbor syndrome link is the main well-established association reported in clinical genetics.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common throughout the general population. Most do not have a direct effect on health and simply contribute to natural human diversity. For many genes, carrying a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when more than one gene and environmental factors are involved. In some cases, 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 SRCAP-related Floating-Harbor syndrome, risk is mostly determined by whether a disease-causing change in the SRCAP gene is present. Lifestyle factors are not known to meaningfully change the chance of having this condition. If SRCAP-related syndrome runs in a family, an affected parent can pass it on to a child.
Inheritance of SRCAP variants
SRCAP-related conditions are inherited in an autosomal dominant pattern, which means one changed copy of the SRCAP gene can be enough to cause the condition. If a parent carries a disease-causing SRCAP variant, each child has a 50% chance of inheriting it. The SRCAP inheritance pattern also includes new, de novo variants, so some people have the condition even though neither parent carries the variant. This is the well-established pattern for Floating-Harbor syndrome linked to the SRCAP gene.
What does my SRCAP result mean for my family?
For SRCAP, the main known condition is passed in a dominant way, so close relatives such as a parent, brother, sister, or child may also carry the same gene change. In many living with a SRCAP-related condition, the change happened for the first time in them rather than being inherited from a parent. Even so, family members can sometimes be affected too, so the meaning for relatives depends on whether the change was inherited or new.
Genetic information
Genetic testing
How you find out about variants
Doctors find changes in the SRCAP gene with genetic testing for SRCAP variants, usually using a blood sample or saliva. A lab reads the DNA code and checks for variants. Results may show a variant, no variant found, or a result that needs later review.
When should I consider getting a genetic test?
Consider testing the SRCAP gene if a child has features of Floating-Harbor syndrome, such as short stature, delayed speech, and certain facial or hand changes, or if there is a family history of the condition. Testing can help confirm the diagnosis and clarify whether other relatives may also carry the gene change.
A genetic result is only one part of your health story
Genetic results can be informative, but how much they reveal depends on the condition and the specific type of variant involved. Many factors, including lifestyle, environment, age, and medical history, also shape how the body works over time. For some conditions, especially those influenced 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 like medication response, these results can also help put individual experiences into perspective.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. This helps explain why the same drug works well for one person, seems less helpful for another, or causes more side effects in someone else. Part of the difference comes from how the body breaks down, transports, or responds to a medication. These inherited differences are common and can influence both treatment benefit and medication sensitivity.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences can affect a person’s response to medications. It looks at links between genes and drugs to help explain why the same treatment can work differently from one person to another. For many medicines, genes can influence both how the body processes a drug and how strong its effects are. This information can support more informed, individualized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the SRCAP gene
When should I seek medical advice?
There isn't yet a broadly confirmed role for this gene in guiding medication choice or predicting medication response. If you have concerns about side effects, interactions, or how well a treatment is working, discuss them with your doctor.
History
The SRCAP gene entered the medical literature in the late 1990s, when researchers identified it while studying proteins that help regulate gene activity in the cell nucleus. It was named for its link to SNF2 related chromatin remodeling, a process that helps cells control which genes are turned on or off. Building on this early work, scientists later connected harmful variants in the SRCAP gene with Floating-Harbor syndrome, a rare inherited condition first recognized from its clinical features before the genetic cause was known. That discovery gave families a clearer explanation for a pattern of growth, speech, and skeletal differences. Over time, descriptions became more precise as genetic testing linked the syndrome to changes near the end of the SRCAP gene.