The CDC6 gene helps cells start copying their DNA before they divide, which is a basic step in growth and tissue repair. This gene plays an important role in keeping that timing controlled, so each new cell gets the right genetic instructions. If the CDC6 gene does not work properly, cells may divide less effectively, and some people can have a growth condition called Meier-Gorlin syndrome, often with short stature and small kneecaps or ears. The CDC6 gene is mainly known in medicine and research rather than in popular culture.
What is a gene?
Genes are sections of DNA that carry instructions cells use to make molecules or regulate processes in the body. Some genes provide the instructions for producing proteins, the working parts of cells. Others mainly help determine when certain processes occur, where they occur, and how strongly they take place. Together, genes affect how the body develops and works, and they can also influence how you respond to food, stress, or medications. To explore this subject in greater depth, you can find more in the LearnHub.
Overview
CDC6Gene function
What if the gene works
The CDC6 gene helps cells prepare to copy their DNA before they divide. Its protein helps start this copying process at the right time and supports making sure the DNA is copied only once each cycle.
Risk
What if the gene does not work
Variants in the CDC6 gene can cause Meier-Gorlin syndrome, a condition affecting growth and development. Many people have short stature, small ears, and kneecap differences. Milder or more severe variants can influence when features appear and how marked they are.
Treatment
What does that mean for your treatment
For pathogenic variants in the CDC6 gene, no treatment or medication approach specific to this gene is currently established in clinical guidelines. The CDC6 gene is being studied in cancer research as a marker of cell growth and a possible drug target, but this has not led to standard care.
Conditions associated with CDC6
Gene function
What if the gene works
Before a cell divides, it must copy all of its DNA once and in an organized way. The CDC6 gene helps set up that process at an early stage. Its role is like a starter key, helping the cell begin DNA copying in the right place and at the right time.
The CDC6 gene helps cells mark the spots where DNA copying should begin. It works with other proteins to place the MCM helicase (a helper that opens DNA) onto DNA before copying starts.
By loading this helper, CDC6 gets each chromosome ready for DNA copying during the next stage of the cell cycle. This early setup step is central to CDC6 gene function in cell division.
CDC6 also helps keep DNA copying organized so the same stretch is prepared once in each cell cycle. That timing support helps cells divide in a more orderly way.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These differences are common and are part of normal human diversity, including variation 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, however, 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 CDC6 gene can weaken how the CDC6 protein helps license DNA replication (the step that prepares DNA to be copied before a cell divides). This shows how variants influence the CDC6 gene's function: some changes slightly reduce protein stability or energy use, while more severe variants can impair partner binding or leave too little working protein. That can slow cell division and, in the linked growth condition, stronger loss of function often means earlier or marked features.
How variants are linked to conditions
Pathogenic variants in the CDC6 gene cause Meier-Gorlin syndrome, a very rare inherited condition. The main CDC6 gene and Meier-Gorlin syndrome link is to marked short stature, unusually small ears, and kneecaps that are small or absent, though features can vary from person to person. This is the primary well-established condition associated with the CDC6 gene in human genetics.
A variant is not necessarily a diagnosis
Genetic variants are a usual feature of human biology and are widespread across the general population. Most do not directly affect health and simply contribute to normal human variation. In many genes, having a variant associated with a condition points to a possible link rather than a confirmed diagnosis, particularly when more than one gene and environmental influences play a role. There are cases, though, where one well described variant in a particular gene is enough to establish a diagnosis.
Are there things that can increase or change my risk?
There isn't yet broadly confirmed evidence on specific factors that increase or reduce health risks related to the CDC6 gene. If you carry a CDC6 change or it runs in your family, a doctor or genetic counselor can help explain what it may mean for your personal risk.
Inheritance of CDC6 variants
CDC6-related conditions that are clearly established in human genetics are inherited in an autosomal recessive pattern. This means a person usually inherits one altered copy of the CDC6 gene from each parent, and parents who each carry one variant are typically unaffected carriers. When both parents are carriers, each pregnancy has a 25% chance of the child inheriting both variants, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. In practical terms, CDC6 gene inheritance usually involves variants being passed down quietly through families until a child receives both altered copies.
What does my CDC6 result mean for my family?
Changes in the CDC6 gene are linked to a rare inherited condition that usually runs in families in a recessive pattern. For family members, this often means parents can be healthy carriers, and brothers or sisters may also be affected or be carriers. Other relatives may carry the same gene change too, especially on the side of the family it came from.
Genetic information
Genetic testing
How you find out about variants
To find out about variants in the CDC6 gene, genetic testing uses a blood or saliva sample. A lab reads the gene’s DNA code and compares it with the usual sequence to see whether a variant is present. This explains how genetic testing works for CDC6 variants.
When should I consider getting a genetic test?
CDC6 testing may be considered when a baby or child has marked growth delay, very small ears, and little or no kneecaps from early life, which can fit a rare condition called Meier-Gorlin syndrome. It can also be helpful when close relatives have had the same pattern of findings.
A genetic result is only one part of your health story
A genetic result can provide valuable insight, but what it can tell you varies based on the condition and the kind of variant involved. Many other factors, including lifestyle, environment, age, and medical history, also influence how the body functions over time. In some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is most useful when viewed together with other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as 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 DNA can change how the body breaks down a drug, moves it through the body, or responds to it at the drug’s target. This helps explain why the same medication may work well for one person, have less effect in another, or cause more side effects in someone else.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes affect the way people respond to medications. By looking at connections between genes and drugs, it helps explain why the same treatment may work differently from one person to another. For many medicines, genes can influence both how strongly a drug works and how the body processes it. This information can support more informed, more individualized treatment decisions. More on this topic is available in the LearnHub.
Drugs influenced by the CDC6 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 questions about medicines, side effects, or treatment changes are best discussed with your doctor.
History
The CDC6 gene entered genetics through basic research on how cells prepare to copy their DNA before they divide. In the 1990s, scientists studying budding yeast identified CDC6 as one of the key cell division control genes, which helped explain why cells must complete certain steps in the right order. Building on this early work, scientists found closely related CDC6 genes in animals and humans, linking earlier lab discoveries to human biology. This research became part of a broader shift in cell biology, where the timing of DNA copying was mapped gene by gene. Over time, descriptions became more precise. Today, CDC6 is remembered mainly for its role in the history of DNA replication research rather than for a major public awareness story.