Your body uses the SRC gene to pass signals that tell cells when to grow, stick in place, move, and survive. This gene plays an important role in keeping those signals balanced. If SRC activity becomes too strong or poorly controlled, cells may grow or spread more than they should, which is linked to several cancers. The SRC gene also became important in medical history because it helped scientists discover how some genes can drive cancer.
What is a gene?
A gene is a section of DNA that holds information cells use to make molecules or regulate processes in the body. Some genes provide the instructions for making proteins, the parts of cells that do the work. Others mainly help control when certain processes happen, where they happen, and how active they are. Taken together, genes affect how the body grows and works, and they can influence how you respond to food, stress, or medications. More detail on this topic is available in the LearnHub.
Overview
SRCGene function
What if the gene works
The SRC gene helps cells send signals that guide growth, movement, and attachment to nearby cells. Its protein supports normal communication inside cells and helps tissues respond to everyday demands.
Risk
What if the gene does not work
Variants in the SRC gene can cause inherited low platelet counts with easy bruising or bleeding, sometimes with bone changes or progressive myelofibrosis. Milder and more severe variants may affect when features appear and how pronounced they are.
Treatment
What does that mean for your treatment
No treatment or drug choice is currently guided specifically by pathogenic or loss-of-function variants in the SRC gene. The SRC gene is being studied as a cancer drug target and biomarker, but this has not led to routine treatment choices based on SRC in clinical guidelines.
Conditions associated with SRC
Gene function
What if the gene works
Cells constantly respond to cues from their surroundings. One important part of that response is the SRC gene, which helps convert outside signals into organized actions inside the cell. Knowing what the SRC gene does in cells helps explain how tissues stay connected, adjust their shape, and support everyday repair.
The SRC gene helps cells pass messages from surface sensors to the inner machinery that carries out those instructions. This supports routine responses to nearby cues, including signals that guide growth and activity.
Its protein helps cells reorganize their inner support framework so they can change shape and move in a coordinated way. This is part of normal processes such as wound repair and immune cell travel.
SRC also helps cells sense how firmly they are attached to nearby cells and surrounding tissue. By linking attachment signals to cell behavior, it supports stable tissue structure and controlled movement when needed.
Through these signaling pathways, the SRC gene helps fine tune cell growth, division, and survival. When it is working properly, cells respond in a measured way instead of overreacting to routine cues.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and help explain normal differences among people, including variation in appearance, metabolism, and the way the body reacts to environmental influences. Many variants do not have any noticeable effect and are part of natural genetic variation. Sometimes, though, a variant changes how a gene works to a greater extent and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the SRC gene can alter the protein's shape or its built-in braking system, often making signaling too active. Most SRC variants linked to disease are activating changes that weaken this self-control and keep the protein switched on longer. SRC gene variants affect function by changing stability or signal strength, with some causing milder shifts and others having a larger effect. In inherited SRC-related disease, stronger activating variants may be linked to earlier or broader features.
How variants are linked to conditions
Pathogenic variants in the SRC gene are most clearly linked to a rare inherited platelet condition that can cause low platelet counts, easy bruising, nosebleeds, or heavier bleeding. In some people, SRC-related thrombocytopenia is also associated with bone marrow scarring called myelofibrosis, and sometimes with changes in bone density. Outside this rare condition, acquired changes involving the SRC gene have been reported in some cancers, but these do not make SRC a common inherited cancer syndrome.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widely found 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 several genes and environmental factors are involved. In some situations, 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 SRC gene itself. If SRC is part of your test results, a doctor or genetic counselor can help explain what that finding may mean in the context of your personal and family history.
Inheritance of SRC variants
For the best described SRC-related condition, how SRC gene variants are inherited follows an autosomal dominant pattern. This means a person with a disease-causing variant in one copy of the SRC gene can pass it to a child, and each pregnancy carries a 50% chance of inheriting that variant. Sons and daughters can inherit it equally, and it can be passed from either parent.
What does my SRC result mean for my family?
For SRC, the best-established family pattern is dominant, which means close relatives such as a parent, brother, sister, or child may also carry the same gene change. In families with an SRC-related condition, relatives can sometimes have similar problems such as low platelets, easy bruising, or bleeding, although symptoms may vary from person to person. This kind of result can also appear for the first time in one family member.
Genetic information
Genetic testing
How you find out about variants
To find out about variants in the SRC gene, genetic testing usually analyzes DNA from a blood sample or saliva sample. A lab reads the gene’s sequence to look for changes, then reports whether a variant was found and whether its meaning is clearly linked to health, uncertain, or considered benign.
When should I consider getting a genetic test?
Consider testing for the SRC gene if you or close relatives have lifelong low platelets, easy bruising or bleeding, and this runs in the family. In some families, changes in SRC are linked to inherited platelet conditions and sometimes bone changes. A doctor or genetic counselor can help decide whether SRC should be part of a broader testing panel.
A genetic result is only one part of your health story
Genetic results can be informative, but how much they reveal varies by the condition and the specific type of variant involved. Over time, factors such as lifestyle, environment, age, and medical history also influence how the body functions. For some conditions, especially those affected by many genes, genetic information provides context rather than certainty and is best considered along with other parts of care. In other situations, a genetic result may offer a clear answer. In areas like medication response, genetic results can also help put individual experiences into context.
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. This is one reason the same medication may work well for one person, work less well for another, or cause more side effects in someone who is more sensitive to it.
What is Pharmacogenetics?
Pharmacogenetics studies how genetic differences can affect the way a person responds to medication. It examines gene and drug patterns to help explain why the same treatment may work differently from one person to another. For many medicines, genes can influence how strongly a drug works or how the body handles it. This information can help support treatment decisions that are both more informed and more individualized. To explore this topic further, you can learn more in the LearnHub.
Drugs influenced by the SRC gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding routine medication choices, so general questions about symptoms, side effects, or treatment changes are best discussed with your doctor. SRC has been studied in cancer research because it can affect how tumor cells send growth signals and may influence response to some cancer medicines, but this is not used routinely to choose treatment.
History
The SRC gene has a landmark place in cancer research because its story began with studies of the Rous sarcoma virus in the early 1900s. First described in the scientific literature as part of early genetics, the viral version of SRC helped show that cancer could be driven by specific genetic changes rather than being seen only as a disease of tissues or organs. In the 1970s, researchers discovered that a related SRC gene was already present in normal animal and human cells, which helped establish the idea of the proto-oncogene. Building on this early work, scientists uncovered more about the gene and opened a new era in molecular cancer biology. This history also helped shape modern thinking about how altered cell signals can contribute to tumor growth.