The CEP135 gene helps cells organize the machinery they need to divide in an orderly way, which is especially important as the brain grows before birth. This gene plays an important role in building the cell structures that pull genetic material apart during division. When both copies do not work properly, brain and body growth can be affected, and some children are born with a much smaller head size, short stature, or developmental delay.
What is a gene?
Genes are stretches of DNA that carry instructions your cells use to make molecules or manage activities in the body. Some genes provide the code for proteins, which do much of the cell’s work. Others mainly regulate when specific processes happen, where they happen, and how active they are. In combination, genes affect how the body grows and works, and they can influence how you respond to food, stress, and medications. More detail on this topic is available in the LearnHub.
Overview
CEP135Gene function
What if the gene works
The CEP135 gene helps cells build centrioles, small structures that organize cell division. This supports normal growth and development, especially in tissues where cells divide often.
Risk
What if the gene does not work
More disruptive variants in the CEP135 gene can cause marked small head size, slow growth, and developmental differences that often begin before birth. Milder variants may lead to a broader range of learning and movement challenges.
Treatment
What does that mean for your treatment
No CEP135-specific treatment or management approach is currently established, so a pathogenic variant in the CEP135 gene does not currently direct any specific drug choice.
Conditions associated with CEP135
Gene function
What if the gene works
When cells prepare to divide, they need sturdy internal parts to keep the process organized. The CEP135 gene helps build and support centrioles, small structures that act as anchors inside the cell. These structures help cells arrange their internal fibers and split genetic material in a controlled way.
The CEP135 gene helps assemble centrioles, the short barrel-shaped structures at the center of the cell's organizing hub. Its protein becomes part of the centriole's framework and helps give it shape and stability.
Centrioles help organize microtubules, the tiny fibers that act like tracks and support beams inside cells. By supporting centriole structure, the CEP135 gene helps cells keep this internal scaffold ordered.
During cell division, centrioles help form the spindle (the set of fibers that pulls chromosomes apart). This means the CEP135 gene supports accurate, orderly division as tissues grow and renew themselves.
What is a variant?
A genetic variant is a slight change in the DNA sequence within a gene. These changes are common and help shape normal differences among people, such as appearance, metabolism, or how the body responds to environmental influences. Many variants do not lead to any noticeable effect and are simply part of natural genetic diversity. 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 CEP135 gene can disrupt how cells build centrioles, the small structures that help organize cell division. More disruptive changes often shorten the CEP135 protein or keep it from reaching the cell’s division center, so centriole assembly drops sharply. Milder missense variants may mainly reduce protein stability or weaken its interactions with partner proteins. In people with disease-causing CEP135 gene variants, greater loss of function is often linked to earlier and more marked primary microcephaly and growth restriction.
How variants are linked to conditions
How CEP135 variants are linked to conditions is most clearly seen in autosomal recessive primary microcephaly 8, which is caused by pathogenic variants in the CEP135 gene. People with two pathogenic variants often have a much smaller head size, and some also have developmental delay, intellectual disability, or short stature. Features can vary from person to person.
A variant is not necessarily a diagnosis
Genetic variants are common and are a normal part of human biology. 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 indicates a possible link rather than a definite diagnosis, especially when several genes and environmental factors also contribute. In some situations, though, a single well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For CEP135, risk is mainly tied to whether a child inherits harmful changes in both copies of the gene, so family history and whether both parents carry a change matter most. There is not yet broadly confirmed evidence that lifestyle or environmental factors meaningfully increase or reduce CEP135-related risk.
Inheritance of CEP135 variants
Variants in the CEP135 gene are inherited in an autosomal recessive pattern. This means a child usually inherits one nonworking copy from each parent, while parents who carry one variant are often unaffected. When both parents carry a CEP135 gene variant, each pregnancy has a 25% chance of the child inheriting both altered copies, a 50% chance of being a carrier, and a 25% chance of inheriting neither variant. In practical terms, CEP135 gene inheritance usually involves the same chance for boys and girls because the gene is on chromosome 4.
What does my CEP135 result mean for my family?
For families, a harmful change in the CEP135 gene is mainly relevant for close relatives because this condition is usually inherited in a recessive way. Parents of an affected child are often healthy carriers, and brothers, sisters, and sometimes other relatives may also be carriers or, less often, affected. This means family members may wish to learn whether the same gene change is present in their side of the family.
Genetic information
Genetic testing
How you find out about variants
Genetic testing for CEP135 variants usually uses a blood or saliva sample. A lab reads the DNA code in the CEP135 gene to look for variants that may help explain a person’s symptoms or clarify whether they carry a family variant.
When should I consider getting a genetic test?
Consider genetic testing for the CEP135 gene when a baby or child has an unusually small head size, poor growth, developmental delay, or there is a family history of a similar rare inherited condition. Testing can help confirm whether CEP135 is the cause and whether other relatives may also carry the gene change.
A genetic result is only one part of your health story
A genetic result can provide useful insight, but how much it explains varies by the condition and the kind of variant involved. How the body functions over time is also shaped by many factors, including age, lifestyle, environment, and medical history. For some conditions, especially those influenced by many genes, genetic information offers context rather than certainty and is most useful when viewed alongside other parts of care. In other situations, a genetic result can give a clear answer. In areas such as medication response, genetic results may also help put personal 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 its target. This helps explain why the same medication may work well for one person, seem less effective for another, or cause more side effects in someone else. These differences are a normal part of human biology and are one reason treatment response can vary from person to person.
What is Pharmacogenetics?
Pharmacogenetics is the area of study focused on how differences in genes can affect the way a person responds to medications. It examines links between genes and drugs to help explain why the same treatment may work differently in different people. For many medicines, genes can influence either how much effect a drug has or how the body handles it. This information can support treatment decisions that are both better informed and more individualized. More detail on this topic is available in the LearnHub.
Drugs influenced by the CEP135 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding medicine choices, so any concerns about symptoms, treatments, or side effects are best discussed with your doctor or pharmacist.