The CDC45 gene helps cells copy their DNA before they divide, which is essential for normal growth and development. This gene plays an important role in early development, so if it does not work properly, the body may have trouble making enough cells in a controlled way. Rare harmful variants in the CDC45 gene are linked to inherited conditions that can include short stature, small ears, slower growth, and in some people early fusion of the skull bones.
What is a gene?
A gene is a section of DNA that holds instructions your cells use to make molecules or regulate activities in the body. Some genes provide the directions for producing proteins, which are the parts of cells that do much of the work. Others are used mainly to manage when certain processes happen, where they take place, and how active they are. Taken together, genes affect how the body grows and works, and they can also influence how you respond to food, stress, or medications. For a closer look at this subject, you can find more in the LearnHub.
Overview
CDC45Gene function
What if the gene works
The CDC45 gene helps cells copy DNA before they divide. Its protein helps open DNA and supports steady cell growth, especially in developing tissues.
Risk
What if the gene does not work
Variants in the CDC45 gene can cause growth restriction and smaller than usual ears or kneecaps, often within Meier-Gorlin syndrome. Some variants are milder, while more disruptive ones can lead to craniosynostosis, short stature, and developmental differences.
Treatment
What does that mean for your treatment
No treatment or management approach specific to a pathogenic variant in the CDC45 gene is currently established. In research, the CDC45 gene is being studied in some cancers as a marker of cell growth and prognosis rather than a routine guide for drug choice.
Conditions associated with CDC45
Gene function
What if the gene works
Your cells need the CDC45 gene each time they make a fresh copy of DNA before dividing. It helps start the copying process and keeps it moving in an orderly way as new cells form for growth and repair. Understanding what the CDC45 gene does in your cells helps explain how each new cell receives a complete set of genetic instructions.
The CDC45 gene helps switch on the DNA copying machinery at the right point in the cell cycle. This lets a cell begin making a full new copy of its genetic material before division.
Its protein works as part of a group that opens the DNA double strand so each side can be copied. This gives your cells access to the DNA instructions they need to build matching strands.
The CDC45 gene helps the DNA copying machinery move steadily along DNA once copying has started. This supports smooth, orderly chromosome duplication in tissues that regularly grow, heal, and renew themselves.
What is a variant?
A genetic variant is a small difference in the DNA sequence of a gene. These changes are common and help account for normal human diversity, such as differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent 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
Variants in the CDC45 gene can reduce how much protein a cell makes or weaken how well that protein joins the machinery that copies DNA. Changes in the CDC45 gene range from milder variants that leave some activity to more severe variants that make the protein unstable or shortened, so cells copy DNA less efficiently. A larger drop in function is linked to earlier or more noticeable effects in conditions that affect growth and skull development.
How variants are linked to conditions
Among rare inherited growth conditions, CDC45 gene variants linked to Meier-Gorlin syndrome represent the clearest and most consistent finding. This diagnosis often includes marked short stature, small ears, and very small or absent kneecaps, and some people also have craniosynostosis. When both copies of the CDC45 gene carry a pathogenic variant, the finding can help confirm the diagnosis.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are widely seen across the general population. Most do not directly affect health and instead reflect natural human variation. For many genes, carrying a variant associated with a condition suggests a possible link rather than a clear diagnosis, especially when several genes and environmental factors also contribute. In some situations, however, one specific well-studied 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 CDC45 gene. For many living with a CDC45 gene change, risk is mainly linked to the specific variant inherited rather than lifestyle or everyday exposures.
Inheritance of CDC45 variants
For CDC45-related conditions, the inheritance pattern is autosomal recessive. This means a person usually inherits one altered copy of the CDC45 gene from each parent. Parents who each carry one variant are often unaffected themselves, and in each pregnancy they have a 25% chance of having a child with the condition, a 50% chance of having a child who is a carrier, and a 25% chance of having a child with two typical copies of the gene. Sons and daughters are affected at the same rate.
What does my CDC45 result mean for my family?
For CDC45-related conditions, the family impact is usually recessive, which means parents are often healthy carriers of the changed gene. Brothers and sisters may also have the condition or may be carriers, and other relatives can sometimes carry the same variant without knowing it. This can matter for family planning as well as for understanding who else in the family may want to learn their carrier status.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the CDC45 gene, genetic testing for CDC45 variants usually analyzes DNA from a blood sample or saliva. A lab reads the gene's sequence, looks for changes, and a genetics specialist interprets whether any finding is benign, uncertain, or linked to a diagnosed condition.
When should I consider getting a genetic test?
Testing for the CDC45 gene may be worth considering if a child has marked growth restriction, very small ears or kneecaps, early fusion of skull bones, or a family history of a rare inherited growth condition linked to CDC45. A doctor or genetic counselor can help decide whether this gene should be included in testing.
A genetic result is only one part of your health story
A genetic result can provide useful information, but what it can tell you varies with the condition and the kind of variant. Lifestyle, environment, age, and medical history all influence how the body functions over time. In some conditions, especially those shaped by many genes, genetic information offers context rather than certainty and makes most sense alongside other parts of care. In other situations, a genetic result can give a clear answer. For medication response, 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. Small differences in a person’s DNA can change how the body breaks down a drug, how strongly the drug acts, or how sensitive someone is to side effects. This helps explain why the same treatment may work well for one person, seem less effective for another, or feel harder to tolerate, even when both take it in the same way.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in genes can affect the way a person responds to medication. It studies relationships between genes and drugs to better explain why the same treatment may work differently from one person to another. With many medicines, genes help shape how strongly a drug works or how the body handles it. This information can support treatment decisions that are both more informed and more individualized. More on this topic is available in the LearnHub.
Drugs influenced by the CDC45 gene
When should I seek medical advice?
There is no broadly confirmed evidence that changes in this gene should guide medication choices at this time, so general questions about side effects, new symptoms, or how your medicines may affect you are best discussed with your doctor.
History
The CDC45 gene was first identified through cell cycle research in yeast, where scientists were mapping genes needed for cells to copy their DNA and divide. Its name comes from “cell division cycle,” reflecting that early discovery work. Researchers then found closely related versions in other species, which showed that this gene had been conserved across evolution. From these first observations, research expanded steadily, linking the CDC45 gene to the larger group of proteins that start DNA copying. Over time, its place in human genetics became clearer as studies connected rare inherited variants to specific developmental conditions.