The CCDC146 gene helps organize the tiny internal support fibers that sperm cells need to build a normal tail and move properly. If this gene does not work as it should, sperm may have missing, short, bent, or irregular tails and may not swim well, which can lead to male infertility. Changes in the CCDC146 gene are mainly linked to problems with sperm development rather than broader effects on everyday health.
What is a gene?
Genes are stretches of DNA that give your cells instructions for building molecules or regulating activities in the body. Some genes provide the directions for making proteins, which are the parts of cells that do the work. Other genes are used mainly to control when certain activities happen, where they happen, and how active they are. Taken together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. To explore this subject in more detail, you can learn more in the LearnHub.
Overview
CCDC146Gene function
What if the gene works
The CCDC146 gene helps organize structures involved in cell division and movement, including the cell’s organizing center and the sperm tail. Its protein supports normal sperm tail formation and orderly cell structure.
Risk
What if the gene does not work
People who produce sperm and carry pathogenic variants in the CCDC146 gene may have infertility, usually because sperm tails develop abnormally and move poorly. Milder and more severe variants can lead to lower fertility or infertility.
Treatment
What does that mean for your treatment
No CCDC146-specific treatment or drug selection approach is currently established. Care is based on standard fertility management rather than a gene-directed therapy.
Gene function
What if the gene works
Many cells rely on the CCDC146 gene to keep their inner support system organized. It helps manage microtubules, which are tiny tubes that give cells shape, move materials, and guide cell division. In sperm, this same system helps build the long tail needed for steady swimming.
Inside your cells, the CCDC146 gene helps organize microtubules (tiny tubes that support cell shape and movement). This keeps the cell’s internal framework orderly for everyday tasks.
During cell division, CCDC146 helps organize microtubules so chromosomes can separate in a controlled way. This supports an orderly split into two new cells.
In sperm, the CCDC146 gene helps build and maintain the long tail that powers swimming. This supports normal sperm movement, which is an important part of fertility.
What is a variant?
A genetic variant is a slight difference in the DNA sequence within a gene. These differences are common and are part of normal human diversity, including variation in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and are simply part of natural genetic variation. Sometimes, though, a variant changes how a gene works more significantly and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
CCDC146 gene variants can reduce how much protein is made, make the protein unstable, or keep it from reaching the sperm tail’s internal scaffold. In how CCDC146 gene variants affect sperm tail structure, truncating or splice variants often cause a greater loss of function, while some missense variants may leave partial activity. This can interfere with sperm tail assembly and movement, and more severe loss of function is often linked to earlier and more marked sperm abnormalities.
How variants are linked to conditions
Pathogenic variants in the CCDC146 gene cause an inherited form of male infertility, most often multiple morphological abnormalities of the sperm flagella, which means sperm may have unusual shapes and poor swimming ability. When a person inherits pathogenic variants in both copies of this gene, the finding can confirm a recessive fertility condition. Current evidence mainly links the CCDC146 gene to male infertility rather than to a broader syndrome.
A variant is not necessarily a diagnosis
Genetic variants are a routine feature of human biology and are widely found across the general population. Most do not directly affect health and simply reflect normal human diversity. For many genes, having a variant associated with a condition points to a possible link rather than a confirmed diagnosis, particularly when several genes and environmental influences play a role. In some situations, though, one well-characterized variant in a specific gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For CCDC146, risk is mainly set by genetics rather than lifestyle. A child is more likely to have a CCDC146-related condition when both biological parents carry a harmful change in the CCDC146 gene; there is not enough evidence to say that diet, exercise, or everyday habits change that risk.
Inheritance of CCDC146 variants
Variants in the CCDC146 gene linked to CCDC146-related male infertility are inherited in an autosomal recessive pattern. This means a person usually inherits one altered copy from each parent, and the parents are typically healthy carriers. When both parents carry a variant in the CCDC146 gene, 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. Sons and daughters can inherit the variants equally, although the fertility effect is mainly seen in males.
What does my CCDC146 result mean for my family?
For families with a disease-causing change in the CCDC146 gene, the pattern is usually recessive, so relatives may be healthy carriers without knowing it. Brothers or sisters could also carry the same gene change, and in some families another male relative may have similar fertility problems. Family members may wish to review the result together so they better understand who else could carry it.
Genetic information
Genetic testing
How you find out about variants
To look for changes in the CCDC146 gene, genetic testing usually uses a blood sample or saliva sample. In CCDC146 genetic testing, a lab reads the gene’s DNA code and compares it with the usual sequence to identify variants, then classifies them as likely harmless, uncertain, or linked to disease based on current evidence.
When should I consider getting a genetic test?
Genetic testing for CCDC146 may be worth considering in men with unexplained infertility, especially when semen testing shows sperm with very poor movement and major tail shape changes. It can also be helpful when similar fertility problems run in the family.
A genetic result is only one part of your health story
A genetic result can provide helpful insight, but how much it reveals depends on the condition and the kind of variant involved. Over time, many factors, including lifestyle, environment, age, and medical history, influence how the body functions. For some conditions, especially those shaped 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 information can 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 genes can change how the body breaks down a drug, moves it through the body, or responds to its effects at the target tissue. This helps explain why the same treatment may work well for one person, seem less effective for another, or cause more side effects in someone else.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect the way medications work in each person. It studies relationships between genes and drugs to help explain why the same treatment may act differently from one person to another. For many medicines, genes influence either how strongly a drug works or how the body processes it. This information can help support treatment decisions that are more informed and more individualized. To explore this subject in greater detail, you can learn more in the LearnHub.
Drugs influenced by the CCDC146 gene
When should I seek medical advice?
There is no broadly confirmed role for this gene in guiding medication choices at this time. If you have symptoms, a new diagnosis, or concerns about side effects or how a medicine is working, talk with your doctor so they can look at your overall health and treatment plan.