The DCC gene helps guide how nerve cells connect during early brain and spinal cord development, shaping coordinated movement and communication between the left and right sides of the body. The protein made by this gene helps your cells respond to guidance signals so growing nerves reach the right targets. When DCC is not working well, some people can develop congenital mirror movements, where one hand copies the other during tasks like writing or buttoning a shirt. Certain DCC gene changes are also linked to differences in brain wiring, such as a partially formed connection between brain halves, and DCC loss in tumor tissue has been tied to some cancers.
What is a gene?
Genes are stretches of DNA that hold instructions your cells use to make molecules or manage activities throughout the body. Certain genes carry the code for building proteins, which do much of the day to day work inside cells. Other genes are more involved in directing timing, location, and intensity for specific body processes. As a group, genes affect how your body grows and operates, and they can also influence how you react to things like food, stress, or medicines. For a deeper look at this subject, you can learn more in the LearnHub.
Overview
DCCGene function
What if the gene works
The DCC gene helps developing nerve cells find their paths and connect by responding to guidance signals. It also supports normal control of cell growth and survival, which can matter for keeping tissues such as the colon lining stable.
Risk
What if the gene does not work
When the DCC gene doesn’t work well, some nerve pathways may not cross normally, causing congenital mirror movements, and sometimes differences in brain midline development that affect coordination. Effects can be mild or more limiting, depending on the DNA change.
Treatment
What does that mean for your treatment
Variants in the DCC gene do not determine a specific drug, so care is tailored to symptoms, such as physical therapy for movement issues. In cancers, DCC findings on tumor panels often add context rather than directing targeted treatment.
Conditions associated with DCC
Gene function
What if the gene works
During early development, your nervous system needs clear “road signs” so nerve cells connect in the right places. Across development, your cells rely on the DCC gene to read certain guidance signals and steer growing nerve connections. This helps build coordinated pathways that later support everyday movement, sensation, and learning.
The DCC gene makes a receptor (a signal receiver on the cell surface) that helps growing nerve fibers choose where to go. It responds to netrin signals, which act like guidance cues that attract or steer these fibers during brain and spinal cord wiring.
DCC supports the process where some nerve pathways cross the body’s midline during development. This helps set up left right coordination in the nervous system so signals can travel between the two sides when needed.
One part of DCC gene function is helping cells match their growth and survival to local netrin signals. With the right signal present, DCC can support stable attachment and outgrowth. When the signal is absent, it can help start programmed cell death (a normal, orderly cell cleanup process).
What is a variant?
A genetic variant refers to a minor difference in the DNA code within a gene. Variants are widespread and help explain normal differences among people, such as traits related to appearance, metabolism, or how the body reacts to environmental factors. Many of these DNA changes do not cause any clear effects and are part of typical genetic diversity. In certain situations, though, a variant can change how a gene works more significantly and may play a role in, or lead to, a genetic condition.
Genetic variants
What if the gene does not work
Variants in the DCC gene can change how nerve pathways connect across the body’s midline, so signals meant for one side may also activate the other. People with a DCC gene mutation and mirror movements may notice involuntary “copycat” motions in the opposite hand during tasks like writing or buttoning a shirt. DNA changes can range from milder variants to severe mutations that reduce DCC activity more strongly, which can influence which features appear and how noticeable they are, including differences in brain wiring such as reduced or absent connections between the two halves of the brain.
How variants are linked to conditions
Pathogenic variants in the DCC gene can cause congenital mirror movements, where one hand unintentionally copies the other during tasks like writing, tying shoes, or using utensils. In some people, DCC gene variants are also linked to differences in midline brain connections, including partial or complete agenesis of the corpus callosum found on MRI. The same genetic change can lead to mild symptoms in one person and more noticeable movement or developmental differences in another.
A variant is not necessarily a diagnosis
Genetic variants are a routine feature of human biology and occur frequently across the population. Most variants do not directly affect health and instead reflect ordinary human differences. For many genes, having a variant that has been linked to a condition points to a potential association rather than a certain diagnosis, particularly when many genes and environmental influences contribute. In other situations, one clearly defined variant in a particular gene may be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
With a harmful change in the DCC gene, the chance of related brain wiring differences is mostly set by genetics, and lifestyle changes are not known to prevent it. Risk can look different even within the same family. What can still help is early attention to signs like ongoing “mirror” hand movements, and supportive care such as physical or occupational therapy to reduce day-to-day impact.
Inheritance of DCC variants
Changes in the DCC gene most often follow an autosomal dominant pattern, which is the typical inheritance of DCC gene variants. This means you can inherit the change from either parent, and each child has a 1 in 2 (50%) chance of inheriting it. Effects can vary widely, so some people who carry the same family change have few or no noticeable symptoms.
What does my DCC result mean for my family?
Seek medical advice if you or a close relative has colon or rectal cancer at a young age, repeated polyps, or several family members with related cancers, especially if a DCC result has been found in the family. Also get help if the result is causing stress or uncertainty about children or siblings. A genetics or cancer specialist can explain what it means for family planning, screening, and treatment choices.
Genetic information
Genetic testing
How you find out about variants
You can learn whether you carry a change in the DCC gene through DCC genetic testing, usually ordered as part of a multigene panel or exome sequencing. The lab analyzes DNA from blood or saliva and reports variants as benign, uncertain, or pathogenic. Results may be confirmed with a second method and are best interpreted alongside your family history.
When should I consider getting a genetic test?
Consider testing the DCC gene if you or your child has lifelong “mirror” movements, where one hand copies the other. It may also be helpful if a brain scan shows the bridge between the two brain halves is missing, especially when similar issues run in the family.
A genetic result is only one part of your health story
A genetic test result can be very informative, but its usefulness varies based on the condition and the specific kind of variant found. Your health over time is also shaped by many factors, including lifestyle, environment, age, and your medical history. With some conditions, particularly those affected by many genes, genetic information offers helpful context rather than a definite prediction and makes the most sense when considered with other parts of your care. In other situations, a genetic finding can give a straightforward explanation. For topics like how someone responds to medications, genetic results can also help put personal experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines, and the DCC gene is not typically used to guide medication choice or dosing. Even with the same diagnosis, one person may feel strong side effects while another notices little change because bodies handle drugs differently. Small inherited differences can influence how quickly a medicine is broken down, how much reaches its target tissues, or how sensitive the body is to its effects. This is common and helps explain why a treatment can work well for one person but not as well for someone else.
What is Pharmacogenetics?
Pharmacogenetics focuses on how inherited genetic differences can affect the way a person responds to medications. It examines relationships between specific genes and particular drugs to explain why the same treatment may have different effects in different people. For many medicines, your genes can influence how your body breaks a drug down or how powerfully it works. This information can support more personalized, better informed treatment choices. More details on this topic are available in the LearnHub.
Drugs influenced by the DCC gene
When should I seek medical advice?
Seek medical advice if you or your child has ongoing “mirror” movements (one hand copies the other), trouble with coordination, or delayed development that affects daily life. If a DCC gene change has already been identified, contact a clinician for new symptoms such as seizures, worsening balance, or weakness. Ask how this diagnosis should guide follow-up care and therapy.
History
In the late 1980s, researchers searching for genetic changes in colorectal tumors repeatedly found a missing stretch of chromosome 18, which led to the identification of the DCC gene and its name, “Deleted in Colorectal Carcinoma.” From these first observations, research expanded steadily as scientists studied how losing this gene might relate to cancer development. In the 1990s, DCC became part of a major shift in neuroscience when it was recognized as a receptor for netrin, a guidance signal that helps growing nerve fibers find their path during development. Over time, discoveries in families also linked certain DCC variants to inherited movement patterns, including congenital mirror movements in some people. These milestones helped establish DCC as a gene of interest across both cancer genetics and brain development research.