The CRKL gene helps cells pass along signals that guide early growth and organ development. If it does not work properly, the heart, face, kidneys, or immune system may not develop in the usual way, and some people may have developmental delay or learning differences. Many clinicians pay attention to this gene when they assess 22q11.2 deletion syndrome, because losing one copy of the CRKL gene may contribute to some features of that condition.
What is a gene?
Genes are sections of DNA that hold instructions your cells can use to make molecules or to manage processes in the body. Some genes carry the information needed to produce proteins, the parts of cells that do the work. Other genes mainly help decide 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. To explore this topic in greater depth, you can learn more in the LearnHub.
Overview
CRKLGene function
What if the gene works
The CRKL gene helps cells pass along signals that guide growth, movement, and early development. It is especially important as the heart, face, and kidneys form.
Risk
What if the gene does not work
Changes that reduce the CRKL gene function are linked to features of 22q11.2 deletion syndrome, especially heart, kidney, and palate development problems. Effects can range from mild to more marked, and more disruptive variants may lead to broader developmental differences.
Treatment
What does that mean for your treatment
No CRKL-specific treatment or management approach is currently established for a pathogenic variant in the CRKL gene. In research settings, CRKL is being studied as a possible biomarker and drug target in some cancers, but this does not currently guide routine treatment for inherited CRKL-related conditions.
Conditions associated with CRKL
Gene function
What if the gene works
In your cells, the CRKL gene helps pass messages from the cell surface to the inner machinery that carries them out. These signals guide everyday tasks like cell growth, attachment, and movement. Understanding how the CRKL gene works in the body helps explain how cells coordinate with nearby cells during normal development and tissue upkeep.
The CRKL gene makes a connector protein that links incoming cell signals to the next steps inside the cell. This helps messages from growth and contact cues move in an organized way.
CRKL helps cells respond to normal growth signals from their surroundings. That supports balanced cell division, cell survival, and day to day tissue maintenance.
CRKL helps coordinate the internal changes cells use to move from one place to another. This is part of normal development, wound repair, and routine cell positioning.
CRKL supports signaling from cell anchors called integrins, which help cells grip nearby tissue. This helps cells stay attached while also adjusting their shape when needed.
What is a variant?
A genetic variant is a slight difference in the DNA sequence within a gene. These differences are common and help account for normal human diversity, including variation in appearance, metabolism, and how the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. At times, however, a variant can change gene function more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the CRKL gene can change how well the protein keeps its shape, stays stable, and links to other proteins in cell signaling pathways. The way CRKL gene variants affect protein function often depends on where the DNA change occurs: milder variants may only partly weaken these protein interactions, while more severe variants can greatly reduce the amount of working protein or stop key binding regions from working. Changes that truncate the protein usually have the largest functional effect.
How variants are linked to conditions
Rare, disruptive variants in the CRKL gene have been linked to a CRKL-related condition that may include congenital heart differences, kidney or urinary tract anomalies, developmental delay, and distinct facial features. Loss of the CRKL gene is also considered one contributor to some features of 22q11.2 deletion syndrome. In practice, CRKL gene variants and kidney or heart birth differences are the best established clinical associations, although the exact pattern can vary widely from person to person.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widespread in the general population. Most do not have a direct effect on health and simply reflect natural human variation. For many genes, carrying a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when multiple genes and environmental factors 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 increase or reduce health risk related to the CRKL gene. For many living with a CRKL change, the main issue is the genetic change itself, while other genes and chance may also influence how strongly it shows up.
Inheritance of CRKL variants
There is not yet a broadly confirmed, single disease-specific inheritance pattern for the CRKL gene that applies across all reported CRKL-related findings, and research on how CRKL variants are inherited is still developing. The CRKL gene is located on chromosome 22, which is an autosome. That means a person inherits one copy of the CRKL gene from each parent, regardless of sex.
What does my CRKL result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific CRKL-related condition that is used consistently in routine patient care. If you have a CRKL result and want to know what it could mean for parents, children, brothers, sisters, or future pregnancies, a genetics specialist can explain it in the context of your exact result and health history.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for CRKL variants usually starts with a blood or saliva sample. A lab may use sequencing to read the CRKL gene and sometimes copy number testing to look for missing or extra pieces of DNA. Results can show a variant, no variant, or a finding whose meaning is still being clarified.
When should I consider getting a genetic test?
There is not yet a broadly established reason to get CRKL testing on its own for most people. Testing decisions are usually based on a child’s or family’s history of certain birth differences, especially heart or kidney problems, or a known small missing piece of chromosome 22, and are best made with a doctor or genetic counselor.
A genetic result is only one part of your health story
Genetic test findings can provide useful information, but what they show depends on the condition and on the type of variant involved. Many other 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 adds context rather than certainty and is best understood alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas such as 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. Some people break down a drug more slowly or more quickly, while others may be more or less sensitive to its effects. This helps explain why the same treatment works well for one person but causes side effects or limited benefit in another. These differences are common and are one part of why medication response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes can affect the way they respond to medicines. It studies the links between genes and medications to help explain why the same treatment may work differently in different people. With many drugs, genes can influence how strongly a medicine works or how the body handles it. Understanding this can support treatment choices that are more informed and more individualized. More on this topic is available in the LearnHub.
Drugs influenced by the CRKL gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medication choice or dosing, so general questions about medicines, side effects, or treatment changes are best discussed with your doctor. In cancer research, CRKL changes have been studied for possible links to how some tumors respond to certain targeted treatments, but this has not become routine drug guidance.
History
The CRKL gene entered research through cancer studies in the 1990s, when scientists identified it as a human relative of an earlier viral gene called CRK. From these first observations, research expanded steadily. Investigators soon linked CRKL to signaling changes seen in chronic myeloid leukemia, especially in cells carrying the Philadelphia chromosome, a chromosome swap long known in leukemia care. Later, interest widened when the CRKL gene was mapped to chromosome 22q11.2, a region tied to a well known deletion syndrome. These milestones placed the CRKL gene in both cancer genetics and developmental genetics research.